POWER INTEGRATIONS INC — Director's Dealing 2010

Jan 12, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: POWER INTEGRATIONS INC (POWI)
CIK: 0000833640
Period of Report: 2010-01-11

Reporting Person: BALAKRISHNAN BALU (President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-01-11	Common Stock	M	3000	$15.0625	Acquired	273465	Indirect
2010-01-11	Common Stock	S	3000	$36.117	Disposed	270465	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-01-11	Non-Qualified Stock Option (right to buy)	$15.0625	M	3000	Disposed	2010-04-14	Common Stock (3000)	Indirect

Footnotes

F1: The range of prices for the enclosed transactions were $35.77 to $36.45.

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.

F2: This sale is pursuant to a 10B5-1 Sales Plan