Document and Entity Information Document - USD ($) $ / shares in Units, $ in Billions	12 Months Ended
	Dec. 31, 2019	Feb. 03, 2020	Jun. 28, 2019
Document Information [Line Items]
Title of 12(b) Security	Common Stock
Entity Address, Address Line One	5245 Hellyer Avenue
Entity Incorporation, State or Country Code	DE
Entity Registrant Name	POWER INTEGRATIONS, INC.
Entity Central Index Key	0000833640
Current Fiscal Year End Date	--12-31
Trading Symbol	POWI
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	000-23441
Document Fiscal Year Focus	2019
Amendment Flag	false
Document Fiscal Period Focus	FY
Entity Listing, Par Value Per Share	$ 0.01
Entity Common Stock, Shares Outstanding		29,538,300
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Small Business	false
Entity Public Float			$ 1.7
Entity Tax Identification Number	94-3065014
City Area Code	408
Local Phone Number	414-9200
Entity Address, City or Town	San Jose
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95138-1002
Security Exchange Name	NASDAQ