POWER INTEGRATIONS INC — Director's Dealing 2010

Mar 9, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: POWER INTEGRATIONS INC (POWI)
CIK: 0000833640
Period of Report: 2010-03-05

Reporting Person: BALAKRISHNAN BALU (President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-03-05	Common Stock	S	8384	$38.8133	Disposed	262081	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	12959	Direct
Common Stock	21023	Indirect
Common Stock	21023	Indirect

Footnotes

F1: Includes 594 shares acquired under the POWI stock purchase plan on January 29, 1999; 2186 shares acquired under the POWI stock purchase plan on July 30, 1999; 1363 shares acquired under the POWI stock purchase plan on January 31, 2000; 377 shares acquired under the POWI stock purchase plan on July 31, 2000; 208 shares acquired under the POWI stock purchase plan on January 31, 2001; 1154 shares acquired under the POWI stock purchase plan on July 31, 2001; 1267 shares acquired under the POWI stock purchase plan on January 31, 2002; 95 shares acquired under the POWI stock purchase plan on July 31, 2002 and 1140 shares acquired under the POWI stock purchase plan on January 31, 2003.

F2: The range of prices for the enclosed transactions were $38.75 to $38.95.

Upon request by the SEC staff, the issuer, or any security holder of the issuer we will provide full information regarding the number of shares sold at each separate price.

F3: The Reporting Person disclaims beneficial ownership of the shares held by the trust except to the extent of his pecuniary interest therein, and this report should not be deemed an admission that the Reporting Person is the beneficial owner of the trust's shares for purposes of Section 16 or for any other purpose.