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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0000833640-07-000109.txt : 20071108
<SEC-HEADER>0000833640-07-000109.hdr.sgml : 20071108
<ACCEPTANCE-DATETIME>20071108133300
ACCESSION NUMBER:		0000833640-07-000109
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20071106
FILED AS OF DATE:		20071108
DATE AS OF CHANGE:		20071108

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			POWER INTEGRATIONS INC
		CENTRAL INDEX KEY:			0000833640
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				943065014
		STATE OF INCORPORATION:			CA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		5245 HELLYER AVE
		CITY:			SAN JOSE
		STATE:			CA
		ZIP:			95138
		BUSINESS PHONE:		4084149200

	MAIL ADDRESS:	
		STREET 1:		5245 HELLYER AVE
		CITY:			SAN JOSE
		STATE:			CA
		ZIP:			95138

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Bailey Doug
		CENTRAL INDEX KEY:			0001389039

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-23441
		FILM NUMBER:		071224702

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		408-414-9200

	MAIL ADDRESS:	
		STREET 1:		5245 HELLYER AVE
		CITY:			SAN JOSE
		STATE:			CA
		ZIP:			95138
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgardoc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2007-11-06</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000833640</issuerCik>
        <issuerName>POWER INTEGRATIONS INC</issuerName>
        <issuerTradingSymbol>POWI</issuerTradingSymbol>
    </issuer>

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            <rptOwnerName>Bailey Doug</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>5245 HELLYER AVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SAN JOSE</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>95138</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>VP Marketing</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

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            <transactionAmounts>
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            <transactionAmounts>
                <transactionShares>
                    <value>600</value>
                </transactionShares>
                <transactionPricePerShare>
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                </transactionAcquiredDisposedCode>
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    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Non-Qualified Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>19.73</value>
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                    <value>D</value>
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    <footnotes>
        <footnote id="F1">This sale is pursuant to a 10B5-1 Sales Plan</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>By: /s/ Rafael Torres Attorney-In-Fact  For: Doug Bailey</signatureName>
        <signatureDate>2007-11-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----