POWER INTEGRATIONS INC — Director's Dealing 2012

May 8, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: POWER INTEGRATIONS INC (POWI)
CIK: 0000833640
Period of Report: 2012-05-04

Reporting Person: BALAKRISHNAN BALU (President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-05-04	Common Stock	S	1952	$43.733	Disposed	45077	Direct
2012-05-04	Common Stock	M	3000	$17.75	Acquired	254579	Indirect
2012-05-04	Common Stock	S	3000	$42.5	Disposed	251579	Indirect
2012-05-04	Common Stock	M	2000	$17.75	Acquired	253579	Indirect
2012-05-04	Common Stock	S	2000	$43.5896	Disposed	251579	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-05-04	Non-Qualified Stock Option (right to buy)	$17.75	M	3000	Disposed	2013-01-08	Common Stock (3000)	Indirect
2012-05-04	Non-Qualified Stock Option (right to buy)	$17.75	M	2000	Disposed	2013-01-08	Common Stock (2000)	Indirect

Footnotes

F1: The range of prices for the enclosed transactions were $43.46 to $43.70.

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