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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 10-Q

(Mark One)

OR

Commission File Number 0-23441

POWER INTEGRATIONS, INC.

(Exact name of registrant as specified in its charter)

5245 Hellyer Avenue, San Jose, California 95138

(Address of principal executive offices)         (Zip code)

(408) 414-9200

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    YES  x    NO  ¨

Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Act).    YES  x    NO  ¨

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

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POWER INTEGRATIONS, INC.

TABLE OF CONTENTS

TOPSwitch, TinySwitch, LinkSwitch, DPA-Switch, EcoSmart and P I Expert are trademarks of Power Integrations, Inc.

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PART I.    FINANCIAL INFORMATION

ITEM 1.    FINANCIAL STATEMENTS

POWER INTEGRATIONS, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(unaudited)

(In thousands)

The accompanying notes are an integral part of these condensed consolidated financial statements.

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POWER INTEGRATIONS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(unaudited)

(In thousands, except per share amounts)

The accompanying notes are an integral part of these condensed consolidated financial statements.

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POWER INTEGRATIONS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited)

(In thousands)

The accompanying notes are an integral part of these condensed consolidated financial statements.

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POWER INTEGRATIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1.    BASIS OF PRESENTATION:

The condensed consolidated financial statements include the accounts of Power Integrations, Inc. (the Company), a Delaware corporation, and its wholly owned subsidiaries. Significant inter-company accounts and transactions have been eliminated.

While the financial information furnished is unaudited, the condensed consolidated financial statements included in this report reflect all adjustments (consisting only of normal recurring adjustments) which the Company considers necessary for the fair presentation of the results of operations for the interim periods covered and of the financial condition of the Company at the date of the interim balance sheet. The results for interim periods are not necessarily indicative of the results for the entire year. Certain reclassifications were made to the prior year financial information to conform to the current period presentation. The condensed consolidated financial statements should be read in conjunction with the Power Integrations, Inc. consolidated financial statements and the notes thereto for the year ended December 31, 2002 included in its Form 10-K filed on March 21, 2003 with the Securities and Exchange Commission.

2.    SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:

Cash and Cash Equivalents and Short-Term Investments

The Company considers cash invested in highly liquid financial instruments with an original maturity of three months or less to be cash equivalents. Investments in highly liquid financial instruments with original maturities greater than three months but not longer than fifteen months are classified as short-term investments. As of March 31, 2003, the Company’s short-term investments consisted of U.S. government backed securities, corporate commercial paper and other high quality commercial securities, which were classified as held-to-maturity and were valued using the amortized cost method, which approximates fair market value.

Revenue Recognition

Product revenues consist of sales to original equipment manufacturers, or OEMs, merchant power supply manufacturers and distributors. Revenues from product sales to OEMs and merchant power supply manufacturers are recognized upon shipment. Sales to distributors are made under terms allowing certain rights of return and protection against subsequent price declines on the Company’s products held by the distributors. As a result of the Company’s distributor agreements, the Company defers recognition of revenue and the proportionate costs of revenues derived from sales to distributors until such distributors resell the Company’s products to their customers. The gross profit that is deferred as a result of this policy is reflected as “deferred income on sales to distributors” in the accompanying condensed consolidated balance sheets.

The Company has a wafer supply and technology license agreement with an unaffiliated wafer foundry. The wafer supply agreement, which expires in June 2005, is renewable. In connection with the technology license agreement, the Company is entitled to receive a royalty on the foundry’s sales of its own products that incorporate the Company’s technology. The Company recognizes revenue upon receipt of payment from the foundry.

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POWER INTEGRATIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Stock-Based Compensation

The Company has elected to follow Accounting Principles Board Opinion (“APB”) No. 25, “Accounting for Stock Issued to Employees,” and related interpretations, in accounting for employee stock options rather than the alternative fair value accounting allowed by SFAS No. 123, “Accounting for Stock Based Compensation.” APB No. 25 provides that compensation expense relative to the Company’s employee stock options is measured based on the intrinsic value of stock options granted on the date of the grant and the Company recognizes compensation expense in its statement of income using the straight-line method over the vesting period for fixed awards. Under SFAS No. 123, the fair value of stock options at the date of grant is recognized in earnings over the vesting period of the options. Had compensation expense for the Plans been determined under a fair value method consistent with SFAS No. 123, “Accounting for Stock Based Compensation,” and related interpretations the Company’s net income would have been reduced to the following pro forma amounts (in thousands, except per share information):

The weighted-average grant date fair value of options granted during the three months ended March 31, 2003 and 2002 was $13.99 and $11.83, respectively. The fair value of stock options granted is established on the date of the grant using the Black-Scholes option pricing model with the following weighted average assumptions for grants in the first quarter of 2003 and 2002.

Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. On an on-going basis, the Company evaluates its estimates, including those related to revenue recognition and allowances for receivables and inventories. These estimates are based on historical facts and various other assumptions that the Company believes to be reasonable at the time the estimates are made.

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POWER INTEGRATIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Comprehensive Income

Comprehensive income for the Company consists of net income, plus the effect of foreign currency translation adjustments, which was not material for the three months ended March 31, 2003 and 2002. Accordingly, comprehensive income closely approximates actual net income.

Segment Reporting

The Company is organized and operates as one business segment—the design, development, manufacture and marketing of proprietary, high-voltage, analog integrated circuits for use primarily in the AC to DC and DC to DC power conversion markets.

Recent Accounting Pronouncements

In December 2002, the FASB issued SFAS No. 148 “Accounting for Stock-Based Compensation—Transition and Disclosure”. SFAS No. 148 amends SFAS No. 123, to provide alternative methods of transition for a voluntary change to the fair value based method of accounting for stock-based employee compensation. In addition, SFAS No. 148 amends the disclosure requirements of SFAS No. 123 to require prominent disclosures in both annual and interim financial statements about the method of accounting for stock-based employee compensation and the effect of the method used on reported results. The transition guidance and annual disclosure provisions of SFAS No. 148 are effective for fiscal years ending after December 15, 2002. The interim disclosure provisions are effective for financial reports containing financial statements for interim periods beginning after December 15, 2002. As the Company did not make a voluntary change to the fair value based method of accounting for stock-based employee compensation in the quarter ended March 31, 2003, the adoption of SFAS No. 148 did not have a material impact on the Company’s financial position and results of operations.

In January 2003, the Financial Accounting Standards Board issued FASB Interpretation No. 46, “Consolidation of Variable Interest Entities,” which addresses consolidation by a business of variable interest entities in which it is the primary beneficiary. The Interpretation is effective immediately for certain disclosure requirements and variable interest entities created after January 31, 2003, and in fiscal 2004 for all other variable interest entities. The Company has reviewed the provisions of the Interpretation and has determined that the Company has no variable interest entities, consequently there was no impact on the Company’s financial statements.

Effective prospectively for arrangements entered into in fiscal periods beginning after June 15, 2003, Emerging Issues Task Force (“EITF”) Issue 00-21, “Revenue Arrangements with Multiple Deliverables,” addresses the accounting, by a vendor, for contractual arrangements in which multiple revenue-generating activities will be performed by the vendor. In some situations, the different revenue-generating activities (deliverables) are sufficiently separable and there exists sufficient evidence of fair values to account separately for the different deliverables (that is, there are separate units of accounting). In other situations, some or all of the different deliverables are interrelated closely or there is not sufficient evidence of fair value to account separately for the different deliverables. EITF Issue 00-21 addresses when and, if so, how an arrangement involving multiple deliverables should be divided into separate units of accounting. The Company does not expect the adoption of EITF Issue 00-21 to have a material impact on its consolidated financial statements.

3.    INVENTORIES:

Inventories are stated at the lower of cost (first-in, first-out) or market and consist of the following (in thousands):

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POWER INTEGRATIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

4.    SIGNIFICANT CUSTOMERS AND EXPORT SALES:

Customer Concentration

The Company’s end user base is highly concentrated and a relatively small number of OEMs, power supply merchants and distributors accounted for a significant portion of the Company’s net revenues. Ten customers accounted for approximately 78.7% and 82.3% of total net revenues for the three months ended March 31, 2003 and 2002, respectively.

The following customers accounted for more than 10% of total net revenues:

Customers A and B are distributors of the Company’s products and customer C is an OEM.

Concentration of Credit Risk

Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash investments and trade receivables. The Company has cash investment policies that limit cash investments to short-term, low risk investments. With respect to trade receivables, the Company performs ongoing credit evaluations of its customers’ financial condition and requires letters of credit whenever deemed necessary. Additionally, the Company establishes an allowance for doubtful accounts based upon factors surrounding the credit risk of specific customers, historical trends related to past losses and other relevant information. Account balances are charged off against the allowance after all means of collection have been exhausted and the potential for recovery is considered remote. The Company does not have any off-balance sheet credit exposure related to its customers. As of March 31, 2003 and December 31, 2002, approximately 82.4% and 76% of accounts receivable, respectively, were concentrated with ten customers.

The following customers accounted for more than 10% of accounts receivable:

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POWER INTEGRATIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Export Sales

The Company markets its products in North America and in foreign countries through its sales personnel and a worldwide network of independent sales representatives and distributors. As a percentage of total net revenues, export sales, which consist of domestic sales to customers in foreign countries, are comprised of the following:

Product Sales

Sales of the Company’s TOPSwitch and TinySwitch products accounted for 99.7% and 98.8% of net revenues from product sales for the three months ended March 31, 2003 and 2002, respectively. TOPSwitch products include TOPSwitch, TOPSwitch II, TOPSwitch FX and TOPSwitch GX. TinySwitch products include TinySwitch and TinySwitch II.

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POWER INTEGRATIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

5.    EARNINGS PER SHARE:

Earnings per share are calculated in accordance with SFAS No. 128, “Earnings per Share.” SFAS No. 128 requires companies to compute earnings per share under two different methods (basic and diluted). Basic earnings per share are calculated by dividing net income by the weighted average shares of common stock outstanding during the period. Diluted earnings per share are calculated by dividing net income by the weighted average shares of outstanding common stock and common stock equivalents during the period. Common stock equivalents included in the diluted calculation consist of dilutive shares issuable upon the exercise of outstanding common stock options and shares issuable under the employee stock purchase plan using the treasury stock method.

The following table sets forth the calculation of basic and diluted earnings per share (in thousands, except per share amounts):

6.    PROVISION FOR INCOME TAXES:

Income tax expense for the three-month periods ended March 31, 2003 and 2002 includes a provision for Federal, state and foreign taxes based on the annual estimated effective tax rate applicable to the Company and its subsidiaries for the year. The difference between the Federal statutory rate of 35% and the Company’s effective tax rate of 30% for the three months ended March 31, 2003 and 2002 is primarily due to the beneficial impact of international sales subject to lower tax rates, research and development credits and Federal tax-exempt investments.

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This Management’s Discussion and Analysis of Financial Condition and Results of Operations includes a number of forward-looking statements, which reflect our current views with respect to future events and financial performance. In this report, the words “will”, “expects”, “believe”, “should”, “anticipate”, “if”, “future” and similar expressions identify forward-looking statements. Such statements are subject to certain risks and uncertainties, including our development efforts, the success of our product strategies, the maintenance of significant business relationships, as well as those discussed in the “Factors That May Affect Future Results of Operations” and elsewhere in this report. As a result of these risks, our actual results may differ materially from our historical or anticipated results. We caution you not to place undue reliance on these forward-looking statements, which speak only as of the date of this report.

The following management’s discussion and analysis of financial condition and results of operations should be read in conjunction with management’s discussion and analysis of financial condition and results of operations included in our Form 10-K for the year ended December 31, 2002.

Overview

We design, develop, manufacture and market proprietary, high-voltage, analog integrated circuits, or ICs, for use primarily in AC to DC and DC to DC power conversion markets. We have targeted high-volume power supply markets, including the communications, consumer, computer and industrial electronics markets. Our initial focus is on those applications that are sensitive to size, portability, energy efficiency and time-to-market. We introduced the TOPSwitch family of ICs in 1994 followed by an enhanced family of ICs, TOPSwitch-II, in April 1997. In September 1998, we announced the TinySwitch family of integrated circuits for power supplies used in a broad range of electronic products. TinySwitch ICs, which are designed to reduce standby energy by incorporating our new EcoSmart technology, enable a new class of light, compact, energy-efficient power supplies. In March 2000, we introduced the TOPSwitch-FX family of products, which also incorporates our EcoSmart technology to help engineers meet the growing need for environmentally friendly power solutions. In November 2000, we introduced the TOPSwitch-GX family of products. The GX family is capable of supplying output levels from 6 watts to 290 watts. In March 2001, we introduced the TinySwitch-II family of products with power levels ranging from 3 watts to 20 watts. In June 2002, we introduced DPA-Switch, which is a family of products that is the first highly integrated high-voltage power conversion IC designed specifically for use in DC-DC converters and distributed power architectures (DPAs). The four-device family covers a wide input voltage range of 16V to 75V, targeting 24 V/48V applications. In September 2002, we introduced LinkSwitch, which is an AC-DC power conversion IC specifically designed to replace linear transformers in the 0-3 watt range. The LinkSwitch family will enable electronics manufacturers to build smaller and more energy efficient power supplies for use in a large assortment of electronic products in the 0-3 watt range. All of our products introduced since 1998 incorporate our EcoSmart technology.

Critical Accounting Policies

We believe our critical accounting policies are as follows:

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. On an on-going basis, we evaluate our estimates, including those related to revenue recognition, sales returns, allowance for ship and debit, bad debts and inventories. We base our estimates on historical facts and various other assumptions that we believe to be reasonable at the time the estimates are made. Actual results could differ from those estimates.

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A brief description of these policies is set forth below.

Revenue recognition

Product revenues consist of sales to OEMs, merchant power supply manufacturers and distributors. Revenues from product sales to OEMs and merchant power supply manufacturers are recognized upon shipment. At that time, we provide for estimated sales returns and other allowances related to those sales. Between 50% and 60% of our sales are made to distributors under terms allowing certain rights of return and price protection for our products held in the distributors’ inventories. Therefore, we defer recognition of revenue and the proportionate cost of revenues derived from sales to distributors until the distributors sell our products to their customers. We evaluate the amounts to defer based on the level of actual distributors’ inventory on hand as well as inventory that is in transit. The gross profit that we defer as a result of this policy is reflected as “deferred income on sales to distributors” in the accompanying condensed consolidated balance sheets.

We have a wafer supply and technology license agreement with an unaffiliated wafer foundry. The wafer supply agreement, which expires in June 2005, is renewable. In connection with the technology license agreement, we are entitled to receive a royalty on the foundry’s sales of its own products that incorporate our technology. We recognize this revenue upon receipt of payment from the foundry.

Estimating sales returns and allowances

Net revenue consists of product revenue reduced by estimated sales returns and allowances. To estimate sales returns and allowances, we analyze, both when we initially establish the reserve, and then each quarter when we review the adequacy of the reserve, the following factors: historical returns, current economic trends, levels of inventories of our products held by our customers, and changes in customer demand and acceptance of our products. This reserve is reflected as a reduction to accounts receivable in the accompanying consolidated balance sheets. Increases to the reserve are recorded as a reduction to net revenue. Because the reserve for sales returns and allowances is based on our judgments and estimates, particularly as to future customer demand and acceptance of our products, our reserves may not be adequate to cover actual sales returns and other allowances. If our reserves are not adequate, our net revenues could be adversely affected.

Estimating ship and debit reserve

A large portion of our sales is made to distributors. Under certain circumstances, some of those sales are subject to credits that distributors claim on certain transactions and as protection against subsequent price declines on products they hold. The credits are referred to as “ship and debits.” The credits are available to the distributors after they have sold our products through to their end customer. We maintain a reserve for these credits that appears as a reduction to accounts receivable in our accompanying consolidated balance sheets. Any increase in the reserve results in a corresponding reduction in our net revenues. To establish the adequacy of the reserve, we analyze historical ship and debit payments and levels of inventory in the distributor channels. If our reserves are not adequate, our net revenues could be adversely affected.

Estimating allowance for doubtful accounts

We maintain an allowance for losses we may incur as a result of our customers’ inability to make required payments. Any increase in the allowance results in a corresponding increase in our general and administrative expenses. In establishing this allowance, and then evaluating the adequacy of the allowance for doubtful accounts each quarter, we analyze historical bad debt, customer concentrations, customer credit-worthiness, current economic trends and changes in our customer payment terms. If the financial condition of one or more of our customers unexpectedly deteriorated, resulting in their inability to make payments, or if we otherwise underestimate the losses we incur as a result of our customers’ inability to pay us, we could be required to increase our allowance for doubtful accounts which could adversely affect our operating results.

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Estimating reserve for excess and obsolete inventory

We identify excess and obsolete products and analyze historical usage, forecasted production based on demand forecasts, current economic trends, and historical write-offs when evaluating the adequacy of the reserve for excess and obsolete inventory. This reserve is reflected as a reduction to inventory in the accompanying consolidated balance sheets, and an increase in cost of revenues. If actual market conditions are less favorable than our assumptions, we may be required to take additional reserves, which could adversely impact our cost of revenues and operating results.

Results of Operations

The following table sets forth certain operating data as a percentage of total net revenues for the periods indicated.

Comparison of the Three Months Ended March 31, 2003 and 2002

Net revenues.    Net revenues consist of revenues from product sales, which are calculated net of returns and allowances, plus license fees and royalties paid by licensees of our technology. Net revenues for the three months ended March 31, 2003 were $29.1 million compared to $23.7 million for the three months ended March 31, 2002, an increase of $5.4 million, or 22.9%.

Net revenues from product sales represented $28.7 million and $23.4 million in the first quarter of 2003 and 2002, respectively. The increase in net revenues from product sales for the three months ended March 31, 2003 was driven primarily by increased sales of our products in the communications and industrial end markets. Sales increases were primarily from cell phone chargers in the communications market and a variety of applications in the industrial market including uninterruptible power supplies, utility meters, motor and industrial controls. We expect our full year revenue mix for 2003, as a percentage of net revenues in the end markets which we serve, to be approximately 41% in the communications category, 26% in the consumer category, 20% in the computer category, 6% in the industrial electronics category and 7% in the other category. This compares to approximately 43% in the communications category, 23% in the consumer market category, 21% in the computer category, 6% in the industrial electronics category and 7% in the other category for the full year of 2002. We also expect the revenue mix of our product families for the full year of 2003 to be approximately 24% for TOPSwitch and TOPSwitch II, 22% for TOPSwitch FX and GX, 51% for TinySwitch and TinySwitch II, and 3% for our newest products LinkSwitch and DPA-Switch. This compares to approximately 33% for TOPSwitch and TOPSwitch II, 22% for TOPSwitch FX and GX, 44% for TinySwitch and TinySwitch II, and 1% for other products for the full year of 2002.

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International sales were $27.5 million in the first quarter of 2003 compared to $23.0 million for the same period in 2002, an increase of $4.5 million, or 19.5%, which represented 94.4% of net revenues compared to 97.1% in the comparable period of 2002. The increase in our international sales for the three months ended March 31, 2003 was driven primarily by increased sales of our products in the communications and industrial end markets. Although the power supplies using our products are designed and distributed to end markets worldwide, most of these power supplies are manufactured in Asia. As a result, sales to this region were 81.6% and 80.2% of our product sales for the three months ended March 31, 2003 and 2002, respectively. We expect international sales to continue to account for a large portion of our net revenues.

Direct sales for the first quarter of 2003 were split 59.4% to distributors and 40.6% to original equipment manufacturers, or OEMs, and power supply merchants, compared to 54.5% to distributors and 45.5% to OEMs and power supply merchants for the same quarter in 2002. For the three months ended March 31, 2003, sales to one customer accounted for 30.0% of net revenues, compared to 20.1% of net revenues for the three months ended March 31, 2002. A second customer accounted for 12.9% of net revenues for the three months ended March 31, 2003, compared to 16.7% for the three months ended March 31, 2002. Both of these customers are distributors. A third customer, who is an OEM, accounted for 13.7% of net revenues for the three months ended March 31, 2002 and accounted for less than 10% for the three months ended March 31, 2003. There were no other customers accounting for sales of more than 10% during the periods reported.

Cost of revenues; Gross profit.    Gross profit is equal to net revenues less cost of revenues. Our cost of revenues consists primarily of costs associated with the purchase of wafers from Matsushita Electric Industrial Co, Ltd. (“Matsushita”), and with OKI Electric Industry (“OKI”), the assembly and packaging of our products, and internal labor and overhead associated with the testing of both wafers and packaged components. Gross profit for the first quarter of 2003 was $15.1 million, or 51.8% of net revenues, compared to $10.3 million, or 43.5% of net revenues for the same period in 2002. The increase in gross profit percentage for the three months ended March 31, 2003 was due primarily to manufacturing cost improvements made in 2002, which reduced the cost of the inventory that was sold during the quarter ended March 31, 2003. We expect our gross profit percentage to be in a range of 48% to 50% during 2003, but if pricing pressures from our customers increase during the year as a result of a continued economic slowdown or for other reasons, our gross profit could be lower.

Research and development expenses.    Research and development expenses consist primarily of employee-related expenses, expensed material and facility costs associated with the development of new processes and new products. We also expense prototype wafers and mask sets related to new products as research and development costs until new products are released to production. Research and development expenses for the first quarter of 2003 were $4.1 million compared to $3.6 million for the same period in 2002, which represented 14.0% and 15.2% of our net revenues in each period, respectively. The increase in research and development costs was due primarily to increases in personnel costs associated with the hiring of additional employees over the same period in 2002. We expect research and development expenses to continue to increase in absolute dollars but depending on our ability to sell our products in the current economic environment, the expenses may fluctuate as a percentage of our net revenues.

Sales and marketing expenses.    Sales and marketing expenses consist primarily of employee-related expenses, commissions to sales representatives and facilities expenses, including expenses associated with our regional sales offices and support offices. Sales and marketing expenses for the first quarter of 2003 were $4.0 million compared to $3.4 million for the same period in 2002, which represented 13.9% and 14.4% of our net revenues in each period, respectively. The increase in sales and marketing expenses was due primarily to increased personnel costs consisting of commissions, salaries and other related personnel costs. Included in the above marketing expenses are costs associated with applications engineering, which represented $1.0 million and $900,000 for the three months ended March 31, 2003 and 2002, respectively. We include applications engineering costs as part of sales and marketing expenses due to the fact that our products are generally incorporated into a customer’s power supply at the design stage. Our sales and marketing efforts are focused on facilitating the customer’s use of our products in the design of new power supplies for specific applications. An important competitive factor in determining whether a customer decides to use our products in its designs is our commitment to provide comprehensive application design support. We expect sales and marketing expenses to continue to increase in absolute dollars as we continue to expand our sales and marketing presence worldwide.

General and administrative expenses.    General and administrative expenses consist primarily of employee-related expenses for administration, finance, human resources and general management, as well as consulting fees, outside services, legal fees, auditing and tax services. For the quarters ended March 31, 2003 and 2002, general and administrative expenses were $1.6 million and $1.4 million, respectively, which represented 5.6% and 6.0% of our net revenues,

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respectively. The increase in spending for the comparable three-month periods was attributable primarily to increases in professional and legal expenses. Included in legal expenses are outside costs related to patents, which have been expensed as incurred, and we plan to continue with this policy in the future. We expect general and administrative expenses to increase in absolute dollars but depending on the sales levels we are able to achieve given current economic conditions, they may fluctuate as a percentage of our net revenues.

Other income, net.    Other income, net, for the first quarter of 2003 decreased $136,000 compared to the same period in 2002. The decrease for the three-month period ended March 31, 2003 was due primarily to lower interest rates on our cash equivalents and short-term investments in 2003 compared to 2002.

Provision for income taxes.    Provision for income taxes represents Federal, state and foreign taxes. The provision for income taxes was $1.7 million for the first quarter of 2003 compared to $700,000 for the same period in 2002. Our estimated effective tax rate used for both 2003 and 2002 was 30%. The difference between the statutory rate of 35% and our effective tax rate of 30% for the periods presented is due primarily to the beneficial impact of international sales, research and development credits and Federal tax-exempt investments.

Liquidity and Capital Resources

As of March 31, 2003, we had approximately $113.1 million in cash, cash equivalents and short-term investments, an increase of approximately $3.7 million from December 31, 2002. In addition, under a revolving line of credit with Union Bank of California, we can borrow up to $10.0 million. A portion of the credit line is used to cover advances for commercial letters of credit and standby letters of credit, which we provide to Matsushita and OKI, prior to the shipment of wafers by those foundries to us. As of March 31, 2003, there were outstanding letters of credit totaling approximately $4.7 million. The balance of this credit line was unused and available as of March 31, 2003. The line of credit agreement, which expires on July 1, 2004, contains financial covenants requiring that we maintain profitability on a quarterly basis and not pay or declare dividends without the bank’s prior consent. As of March 31, 2003, we were in compliance with these financial covenants. We have previously financed a significant portion of our machinery and equipment through capital equipment leases. As of March 31, 2003, we owed approximately $215,000 on our various capital equipment leases. There was no additional equipment financing during the three months ended March 31, 2003.

As of March 31, 2003, we had working capital, defined as current assets less current liabilities, of approximately $129.8 million, an increase of approximately $9.5 million from December 31, 2002. Our operating activities generated cash of $1.1 million and $6.3 million in the three months ended March 31, 2003 and 2002, respectively. Cash generated in the first three months of 2003 was principally the result of net income in the amount of $3.9 million, depreciation and amortization and the tax benefit associated with employee stock plans, partially offset by increases in inventory and accounts receivable. Cash generated in the first three months of 2002 was principally the result of net income in the amount of $1.6 million, depreciation and amortization, a decrease in inventory and an increase in accrued liabilities, partially offset by an increase in accounts receivable and a decrease in accounts payable.

Our investing activities were net proceeds of $6.8 million in the three months ended March 31, 2003 from maturities of short-term investments, and net purchases of short-term investments of $4.0 million in the three months ended March 31, 2002. Purchases of property and equipment were $1.4 million and $500,000 in the three months ended March 31, 2003 and 2002, respectively.

Our financing activities were primarily receipts from the issuance of common stock through the exercise of stock options and purchases through our employee stock purchase plan of $4.0 million and $1.5 million in the three months ended March 31, 2003 and 2002, respectively, offset by payments for capitalized lease obligations of $60,000 and $160,000 in the three months ended March 31, 2003 and 2002, respectively.

In April 2003, we entered into a contract, with typical real estate contingencies, to purchase our current San Jose facilities for approximately $30 million. We expect the purchase to close by the end of the third quarter of 2003, and anticipate that the purchase price will be funded from cash and working capital.

During the first three months of 2003, a significant portion of our cash flow was generated by our operations. If our operating results deteriorate during 2003, as a result of decrease in customer demand, or severe pricing pressures from our customers or our competitors, or for other reasons, our ability to generate positive cash flow from operations may be jeopardized. In that case, we may be forced to use our cash, cash equivalents and short-term investments, or seek financing from third parties to fund our operations. We believe that cash generated from operations, together with existing sources of liquidity, will satisfy our projected working capital and other cash requirements for at least the next 12 months.

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Recent Accounting Pronouncements

In December 2002, the FASB issued SFAS No. 148 “Accounting for Stock-Based Compensation—Transition and Disclosure”. SFAS No. 148 amends SFAS No. 123, to provide alternative methods of transition for a voluntary change to the fair value based method of accounting for stock-based employee compensation. In addition, SFAS No. 148 amends the disclosure requirements of SFAS No. 123 to require prominent disclosures in both annual and interim financial statements about the method of accounting for stock-based employee compensation and the effect of the method used on reported results. The transition guidance and annual disclosure provisions of SFAS No. 148 are effective for fiscal years ending after December 15, 2002. The interim disclosure provisions are effective for financial reports containing financial statements for interim periods beginning after December 15, 2002. As the Company did not make a voluntary change to the fair value based method of accounting for stock-based employee compensation in the quarter ended March 31, 2003, the adoption of SFAS No. 148 did not have a material impact on our financial position and results of operations.

In January 2003, the Financial Accounting Standards Board issued FASB Interpretation No. 46, “Consolidation of Variable Interest Entities,” which addresses consolidation by a business of variable interest entities in which it is the primary beneficiary. The Interpretation is effective immediately for certain disclosure requirements and variable interest entities created after January 31, 2003, and in fiscal 2004 for all other variable interest entities. We have reviewed the provisions of the Interpretation and have determined that we have no variable interest entities, consequently there was no impact on our financial statements.

Effective prospectively for arrangements entered into in fiscal periods beginning after June 15, 2003, Emerging Issues Task Force (“EITF”) Issue 00-21, “Revenue Arrangements with Multiple Deliverables,” addresses the accounting, by a vendor, for contractual arrangements in which multiple revenue-generating activities will be performed by the vendor. In some situations, the different revenue-generating activities (deliverables) are sufficiently separable and there exists sufficient evidence of fair values to account separately for the different deliverables (that is, there are separate units of accounting). In other situations, some or all of the different deliverables are interrelated closely or there is not sufficient evidence of fair value to account separately for the different deliverables. EITF Issue 00-21 addresses when and, if so, how an arrangement involving multiple deliverables should be divided into separate units of accounting. We do not expect the adoption of EITF Issue 00-21 to have a material impact on our consolidated financial statements.

Factors That May Affect Future Results of Operations

In addition to the other information in this report, the following factors should be considered carefully in evaluating our business before purchasing shares of our stock.

Our quarterly operating results are volatile and difficult to predict. If we fail to meet the expectations of public market analysts or investors, the market price of our common stock may decrease significantly.    Our net revenues and operating results have varied significantly in the past, are difficult to forecast, are subject to numerous factors both within and outside of our control, and may fluctuate significantly in the future. As a result, our quarterly operating results could fall below the expectations of public market analysts or investors. If that occurs, the price of our stock may decline.

Some of the factors that could affect our operating results include the following:

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We do not have long-term contracts with any of our customers and if they fail to place, or if they cancel or reschedule orders for our products, our operating results and business may suffer.    Our business is characterized by short-term customer orders and shipment schedules. The ordering patterns of some of our existing large customers have been unpredictable in the past, and we expect that customer-ordering patterns will continue to be unpredictable in the future. Not only does the volume of units ordered by particular customers vary substantially from period to period, but also purchase orders received from particular customers often vary substantially from early oral estimates provided by those customers for planning purposes. In addition, customer orders can be canceled or rescheduled without significant penalty to the customer. In the past we have experienced customer cancellations of substantial orders for reasons beyond our control, and significant cancellations could occur again at any time.

Intense competition in the high-voltage power supply industry may lead to a decrease in the average selling price and reduced sales volume of our products, which may harm our business.    The high-voltage power supply industry is intensely competitive and characterized by significant price erosion. Our products face competition from alternative technologies, including traditional linear transformers and discrete switcher power supplies. If the price of competing products decreases significantly, the cost effectiveness of our products will be adversely affected. If power requirements for applications in which our products are currently utilized go outside the cost effective range of our products, these older alternative technologies can be used more cost effectively. We cannot assure you that our products will continue to compete favorably or that we will be successful in the face of increasing competition from new products and enhancements introduced by existing competitors or new companies entering this market. We believe our failure to compete successfully in the high-voltage power supply business, including our ability to introduce new products with higher average selling prices, would materially harm our operating results.

If demand for our products declines in the major end markets that we serve, our net revenues will decrease.    Applications of our products in the consumer, communications and computer end markets, such as cellular phone chargers, stand-by power supplies for PCs, power supplies for TV set top boxes and power supplies for home appliances have and will continue to account for a large percentage of our net revenues. We expect that a significant level of our net revenues and operating results will continue to be dependent upon these applications in the near term. The demand for these products has been highly cyclical and has been subject to significant economic downturns at various times. Announcements of economic slowdown by major companies in any of the end markets we serve, could indirectly through our customers, cause a slowdown in demand for some of our ICs. When our customers are not successful in maintaining high levels of demand for their products, their demand for our ICs decreases, which adversely affects our operating results. Any significant downturn in demand in these markets would cause our net revenues to decline and could cause the price of our stock to fall.

Because the sales cycle for our products can be lengthy, we may incur substantial expenses before we generate significant revenues, if any.    Our products are generally incorporated into a customer’s products at the design stage. However, customer decisions to use our products, commonly referred to as design wins, which can often require us to expend significant research and development and sales and marketing resources without any assurance of success, often precede volume sales, if any, by a year or more. The value of any design win will largely depend upon the commercial success of the customer’s product. We cannot assure you that we will continue to achieve design wins or that any design win will result in future revenues. If a customer decides at the design stage not to incorporate our products into its product, we may not have another opportunity for a design win with respect to that product for many months or years.

Our products must meet exacting specifications, and undetected defects and failures may occur which may cause customers to return or stop buying our products.    Our customers generally establish demanding specifications for quality, performance and reliability that our products must meet. ICs as complex as those we sell often encounter development delays and may contain undetected defects or failures when first introduced or after commencement of commercial shipments. We have from time to time in the past experienced product quality, performance or reliability problems. If defects and failures occur in our products, we could experience lost revenue, increased costs, including warranty expense and costs associated with customer support, delays in or cancellations or rescheduling of orders or shipments and product returns or discounts, any of which would harm our operating results.

Our international sales activities account for a substantial portion of our net revenues and subject us to substantial risks.    Sales to customers outside of the United States account for a large portion of our net revenues, including approximately 94% and 97% of our net revenues in the three months ended March 31, 2003 and 2002, respectively. If our international sales declined and we were unable to increase domestic sales, our revenues would decline and our operating results would be harmed. International sales involve a number of risks to us, including:

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Our failure to adequately address these risks could reduce our international sales, which would materially adversely affect our operating results. Furthermore, because substantially all of our foreign sales are denominated in U.S. dollars, increases in the value of the dollar increase the price in local currencies of our products in foreign markets and make our products relatively more expensive and less price competitive than competitors’ products that are priced in local currencies.

We depend on third-party suppliers to provide us with wafers for our products and if they fail to provide us sufficient wafers, our business will suffer.    We have supply arrangements for the production of wafers with Matsushita, which expires in June 2005, and with OKI, which expires in April 2008. Although certain aspects of our relationships with Matsushita and OKI are contractual, many important aspects of these relationships depend on their continued cooperation. We cannot assure you that we will continue to work successfully with Matsushita or OKI in the future, that they will continue to provide us with sufficient capacity at their foundries to meet our needs, or that either of them will not seek an early termination of its wafer supply agreement with us. Any serious disruption in the supply of wafers from either OKI or Matsushita would harm our business. We estimate that it would take 9 to 12 months from the time we identified an alternate manufacturing source before that source could produce wafers with acceptable manufacturing yields in sufficient quantities to meet our needs.

Although we provide Matsushita and OKI with rolling forecasts of our production requirements, their ability to provide wafers to us is limited by the available capacity of the foundry in which they manufacture wafers for us. An increased need for capacity to meet internal demands or demands of other customers could cause Matsushita and OKI to reduce capacity available to us. Matsushita and OKI may also require us to pay amounts in excess of contracted or anticipated amounts for wafer deliveries or require us to make other concessions in order to acquire the wafer supply necessary to meet our customers’ requirements. Any of these concessions could harm our business.

If our third-party suppliers and independent subcontractors do not produce our wafers and assemble our finished products at acceptable yields, our net revenues may decline.    We depend on Matsushita and OKI to produce wafers, and independent subcontractors to assemble finished products, at acceptable yields and to deliver them to us in a timely manner. The failure of Matsushita or OKI to supply us wafers at acceptable yields could prevent us from selling our products to our customers and would likely cause a decline in our net revenues. In addition, our IC assembly process requires our manufacturers to use a high-voltage molding compound available from only one vendor, which is difficult to process. This compound and its required processes, together with the other non-standard materials and processes needed to assemble our products, require a more exacting level of process control than normally required for standard packages. Unavailability of the sole source compound or problems with the assembly process can materially adversely affect yields and cost to manufacture. We cannot assure you that acceptable yields will be maintainable in the future.

Matsushita has licenses to our technology, which it may use to our detriment.    Our ability to take advantage of the potentially large Japanese market for our products is largely dependent on Matsushita and its ability to promote and deliver our products. Pursuant to our agreement with Matsushita, Matsushita has the right to manufacture and sell products using our technology to Japanese companies worldwide and to subsidiaries of Japanese companies located in Asia. Although we receive royalties on Matsushita’s sales, these royalties are substantially lower than the gross profit we receive on direct sales. We cannot assure you that Matsushita will not use the technology rights we have granted it to develop or market competing products following any termination of its relationship with us or after termination of Matsushita’s royalty obligation to us.

If our efforts to enhance existing products and introduce new products are not successful, we may not be able to generate demand for our products.    Our success depends in significant part upon our ability to develop new ICs for high-voltage power conversion for existing and new markets, to introduce these products in a timely manner and to have these products selected for design into products of leading manufacturers. New product introduction schedules are subject to the

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risks and uncertainties that typically accompany development and delivery of complex technologies to the market place, including product development delays and defects. If we fail to develop and sell new products in a timely manner, our net revenues could decline.

We cannot be sure that we will be able to adjust to changing market demands as quickly and cost-effectively as necessary to compete successfully. Furthermore, we cannot assure you that we will be able to introduce new products in a timely and cost-effective manner or in sufficient quantities to meet customer demand or that these products will achieve market acceptance. Our failure, or our customers’ failure to develop and introduce new products successfully and in a timely manner would harm our business and may cause the price of our common stock to fall. In addition, customers may defer or return orders for existing products in response to the introduction of new products. Although we maintain reserves for potential customer returns, we cannot assure you that these reserves will be adequate.

If our products do not penetrate additional markets, our business will not grow as we predict.    We believe that our future success depends in part upon our ability to penetrate additional markets for our products. We cannot assure you that we will be able to overcome the marketing or technological challenges necessary to do so. To the extent that a competitor penetrates additional markets before we do, or takes market share from us in our existing markets, our net revenues and financial condition could be materially adversely affected.

In the event of an earthquake, terrorist act or other disaster, our operations may be interrupted and our business would be harmed.    Our principal executive offices and operating facilities situated near San Francisco, California, and our major suppliers (foundries and assembly houses) all situated in the Far East, are all located in areas that have been subject to severe earthquakes. In the event of an earthquake, we and/or our major suppliers may be temporarily unable to continue operations and may suffer significant property damage. Any such interruption in our ability or that of our major suppliers to continue operations at our facilities could delay the development and shipment of our products.

Like other U.S. companies, our business and operating results are subject to uncertainties arising out of the recent terrorist attacks on the United States, including the potential worsening or extension of the current global economic slowdown, the economic consequences of current and potential military actions or additional terrorist activities and associated political instability, and the impact of heightened security concerns on domestic and international travel and commerce. Such uncertainties could also lead to delays or cancellations of customer orders, a general decrease in corporate spending or our inability to effectively market and sell our products. Any of these results could substantially harm our business and results of operations, causing a decrease in our revenues.

The recent outbreak of Severe Acute Respiratory Syndrome (SARS) may adversely impact the operations of our major suppliers and our global operations.    In 2003, there has been an outbreak of Severe Acute Respiratory Syndrome (SARS). At the time of this 10-Q filing, the outbreak has been largely concentrated in Asia, although cases have been confirmed in, among other locations, the United States and Canada. SARS could have an adverse impact on our major suppliers, which are located in Asia, resulting in a serious disruption in the supply of wafers and subsequent harm to our business. We estimate that it would take 9 to 12 months from the time we identified an alternate manufacturing source before that source could produce wafers with acceptable manufacturing yields in sufficient quantities to meet our needs. SARs could also have an impact on the end market demand for consumer products that incorporate our chips. If the number of cases continues to rise or spread to other locations, our global sales and operations could be harmed.

If we are unable to adequately protect or enforce our intellectual property rights, we could lose market share, incur costly litigation expenses or lose valuable assets.    Our success depends upon our ability to protect our intellectual property, including patents, trade secrets, and know-how, and to continue our technological innovation. We cannot assure you that the steps we have taken to protect our intellectual property will be adequate to prevent misappropriation or that others will not develop competitive technologies or products. From time to time we have received, and we may receive in the future, communications alleging possible infringement of patents or other intellectual property rights of others. Litigation, which could result in substantial cost to us, may be necessary to enforce our patents or other intellectual property rights or to defend us against claimed infringement of the rights of others. The failure to obtain necessary licenses or other rights or litigation arising out of infringement claims could cause us to lose market share and harm our business.

Moreover, the laws of some foreign countries in which our technology is or may in the future be licensed may not protect our intellectual property rights to the same extent as the laws of the United States, thus increasing the possibility of infringement of our intellectual property.

We must attract and retain qualified personnel to be successful and competition for qualified personnel is intense in our market.    Our success depends to a significant extent upon the continued service of our executive officers and other

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key management and technical personnel, and on our ability to continue to attract, retain and motivate qualified personnel, such as experienced analog design engineers and systems applications engineers. The competition for these employees is intense, particularly in Silicon Valley. The loss of the services of one or more of our engineers, executive officers or other key personnel or our inability to recruit replacements for these individuals or to otherwise attract, retain and motivate qualified personnel could harm our business. We do not have long-term employment contracts with, and we do not have in place key person life insurance policies on, any of our employees.

We have adopted anti-takeover measures, which may make it more difficult for a third party to acquire us.    Our board of directors has the authority to issue up to 3,000,000 shares of preferred stock and to determine the price, rights, preferences and privileges of those shares without any further vote or action by the stockholders. The rights of the holders of common stock will be subject to, and may be adversely affected by, the rights of the holders of any preferred stock that may be issued in the future. The issuance of shares of preferred stock, while potentially providing flexibility in connection with possible acquisitions and for other corporate purposes, could have the effect of making it more difficult for a third party to acquire a majority of our outstanding voting stock. We have no present intention to issue shares of preferred stock.

In addition, our board of directors has adopted a Preferred Stock Purchase Rights Plan intended to guard against hostile takeover tactics. The existence of this plan could have the effect of making it more difficult for a third party to acquire a majority of our outstanding voting stock.

The future trading price of our common stock could be subject to wide fluctuations in response to a variety of factors.    The price of our common stock has been, and is likely to be, volatile. Factors including future announcements concerning us, our customers or our competitors, quarterly variations in operating results, announcements of technological innovations, the introduction of new products or changes in our product pricing policies or those of our competitors, proprietary rights or other litigation, changes in earnings estimates by analysts and other factors could cause the market price of our common stock to fluctuate substantially. In addition, stock prices for many technology companies fluctuate widely for reasons, which may be unrelated to operating results. These fluctuations, as well as general economic, market and political conditions may harm the market price of our common stock.

Recently enacted and proposed changes in securities laws and regulations are likely to increase our costs.    The Sarbanes-Oxley Act of 2002 that became law in July 2002 requires changes in some of our corporate governance practices. The Act also requires the Securities and Exchange Commission to promulgate new rules on a variety of subjects. In addition to final rules and rule proposals already made by the Securities and Exchange Commission, Nasdaq has proposed revisions to its requirements for companies that are Nasdaq-listed. We expect these new rules and regulations to increase our legal and financial compliance costs, and to make some activities more difficult, time consuming and/or costly. We also expect these new rules and regulations to make it more expensive for us to obtain director and officer liability insurance, and we may be required to accept reduced coverage or incur substantially higher costs to obtain coverage. These new rules and regulations could also make it more difficult for us to attract and retain qualified members of our board of directors, particularly to serve on our audit committee, and qualified executive officers.

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ITEM 3.    QUANTITATIVE AND QUALITATIVE DISCLOSURE ABOUT MARKET RISKS.

There has not been a material change in our exposure to interest rate and foreign currency risks from that described in our 2002 Annual Report on Form 10-K.

Interest Rate Risk.    Our exposure to market risk for changes in interest rates relates primarily to our investment portfolio. We do not use derivative financial instruments in our investment portfolio to manage our interest rate risk, foreign currency risk, or for any other purpose. We invest in high-credit quality issuers and, by policy, limit the amount of credit exposure to any one issuer. As stated in our policy, we ensure the safety and preservation of our invested principal funds by limiting default risk, market risk and reinvestment risk. We mitigate default risk by investing in safe and high-credit quality securities and by constantly positioning our portfolio to respond appropriately to a significant reduction in a credit rating of any investment issuer, guarantor or depository. The portfolio includes only marketable securities with active secondary or resale markets to ensure portfolio liquidity.

The table below presents carrying value and related weighted average interest rates for our investment portfolio at March 31, 2003. All investments mature, by policy, in 15 months or less.

(in thousands, except average interest rates)

Foreign Currency Exchange Risk.    We transact business in various foreign countries. Our primary foreign currency cash flows are in Asia and Western Europe. Currently, we do not employ a foreign currency hedge program utilizing foreign currency forward exchange contracts as the foreign currency transactions and risks to date have not been significant. We do maintain a Japanese yen account with a U. S. bank for payments to suppliers and for cash receipts from Japanese suppliers and customers denominated in Japanese yen.

ITEM 4.    CONTROLS AND PROCEDURES.

a)    Under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, we conducted an evaluation of our disclosure controls and procedures, as such term is defined under Rule 13a-14(c) promulgated under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), within 90 days of the filing date of this report. Based on their evaluation, our principal executive officer and principal financial officer concluded that our disclosure controls and procedures are effective.

b)    There have been no significant changes (including corrective actions with regard to significant deficiencies or material weaknesses) in our internal controls or in other factors that could significantly affect these controls subsequent to the date of the evaluation referenced in paragraph (a) above.

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PART II.    OTHER INFORMATION

ITEM 1.    LEGAL PROCEEDINGS

The Company is involved in various claims and legal actions arising in the ordinary course of business. In the opinion of management, the ultimate disposition of these matters will not have a material adverse effect on the Company’s consolidated financial position, results of operations, or liquidity.

ITEM 2.    CHANGES IN SECURITIES AND USE OF PROCEEDS

None.

ITEM 3.    DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4.    SUBMISSION OF MATTERS TO VOTE OF SECURITY HOLDERS

None.

ITEM 5.    OTHER INFORMATION

None.

ITEM 6.    EXHIBITS AND REPORTS ON FORM 8-K

a.    Exhibits.

b.    Reports on Form 8-K.

None.

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this Report to be signed on its behalf by the undersigned, thereunto duly authorized.

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CERTIFICATIONS

I, Balu Balakrishnan, Chief Executive Officer of the registrant, certify that:

1.    I have reviewed this quarterly report on Form 10-Q of Power Integrations, Inc.;

2.    Based on my knowledge, this quarterly report does not contain any untrue statement of a material fact or omit to state a material fact necessary in order to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this quarterly report;

3.    Based on my knowledge, the financial statements, and other financial information included in this quarterly report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this quarterly report;

4.    The registrant’s other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-14 and 15d-14) for the registrant and we have:

(a)    designed such disclosure controls and procedures to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this quarterly report is being prepared;

(b)    evaluated the effectiveness of the registrant’s disclosure controls and procedures as of a date within 90 days prior to the filing date of this quarterly report (the “Evaluation Date”); and

(c)    presented in this quarterly report our conclusions about the effectiveness of the disclosure controls and procedures based on our evaluation as of the Evaluation Date;

5.    The registrant’s other certifying officers and I have disclosed, based on our most recent evaluation, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent function):

(a)    all significant deficiencies in the design or operation of internal controls which could adversely affect the registrant’s ability to record, process, summarize and report financial data and have identified for the registrant’s auditors any material weaknesses in internal controls; and

(b)    any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal controls; and

6.    The registrant’s other certifying officers and I have indicated in this quarterly report whether or not there were significant changes in internal controls or in other factors that could significantly affect the internal controls subsequent to the date of our most recent evaluation, including any corrective actions with regard to significant deficiencies and material weaknesses.

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I, John M. Cobb, Chief Financial Officer of the registrant, certify that:

1.    I have reviewed this quarterly report on Form 10-Q of Power Integrations, Inc.;

2.    Based on my knowledge, this quarterly report does not contain any untrue statement of a material fact or omit to state a material fact necessary in order to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this quarterly report;

3.    Based on my knowledge, the financial statements, and other financial information included in this quarterly report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this quarterly report;

4.    The registrant’s other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-14 and 15d-14) for the registrant and we have:

(a)    designed such disclosure controls and procedures to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this quarterly report is being prepared;

(b)    evaluated the effectiveness of the registrant’s disclosure controls and procedures as of a date within 90 days prior to the filing date of this quarterly report (the “Evaluation Date”); and

(c)    presented in this quarterly report our conclusions about the effectiveness of the disclosure controls and procedures based on our evaluation as of the Evaluation Date;

5.    The registrant’s other certifying officers and I have disclosed, based on our most recent evaluation, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent function):

(a)    all significant deficiencies in the design or operation of internal controls which could adversely affect the registrant’s ability to record, process, summarize and report financial data and have identified for the registrant’s auditors any material weaknesses in internal controls; and

(b)    any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal controls; and

6.    The registrant’s other certifying officers and I have indicated in this quarterly report whether or not there were significant changes in internal controls or in other factors that could significantly affect the internal controls subsequent to the date of our most recent evaluation, including any corrective actions with regard to significant deficiencies and material weaknesses.

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