POWER INTEGRATIONS INC — Director's Dealing 2011

May 9, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: POWER INTEGRATIONS INC (POWI)
CIK: 0000833640
Period of Report: 2011-05-05

Reporting Person: BALAKRISHNAN BALU (President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-05-05	Common Stock	A	25000	—	Acquired	47029	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-05-05	Incentive Stock Option (right to buy)	$36.95	A	2706	Acquired	2021-05-05	Common Stock (2706)	Direct
2011-05-05	Non-Qualified Stock Option (right to buy)	$36.95	A	47294	Acquired	2021-05-05	Common Stock (47294)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	246152	Indirect