Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
Bell Derek
   2. Issuer Name and Ticker or Trading Symbol
POWER INTEGRATIONS INC [powi] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
VP of Engineering
(Last)
(First)
(Middle)
C/O POWER INTEGRATIONS, 5245 HELLYER AVE		 3. Date of Earliest Transaction (Month/Day/Year)
09/24/2007
(Street)

SAN JOSE, CA 95138		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 09/24/2007   M   576 A $ 14.82 5,385 D  
Common Stock 09/24/2007   S   576 D $ 30.91 4,809 D  
Common Stock 09/24/2007   M   1,349 A $ 14.82 6,158 D  
Common Stock 09/24/2007   S   1,349 D $ 30.91 4,809 D  
Common Stock 09/24/2007   M   639 A $ 14.82 5,448 D  
Common Stock 09/24/2007   S   639 D $ 30.92 4,809 D  
Common Stock 09/24/2007   M   364 A $ 14.82 5,173 D  
Common Stock 09/24/2007   S   364 D $ 30.93 4,809 D  
Common Stock 09/24/2007   M   111 A $ 14.82 4,920 D  
Common Stock 09/24/2007   S   111 D $ 30.94 4,809 D  
Common Stock 09/24/2007   M   944 A $ 14.82 5,753 D  
Common Stock 09/24/2007   S   944 D $ 30.95 4,809 D  
Common Stock 09/24/2007   M   110 A $ 14.82 4,919 D  
Common Stock 09/24/2007   S   110 D $ 30.96 4,809 D  
Common Stock 09/24/2007   M   389 A $ 14.82 5,198 D  
Common Stock 09/24/2007   S   389 D $ 30.99 4,809 D  
Common Stock 09/24/2007   M   944 A $ 14.82 5,753 D  
Common Stock 09/24/2007   S   944 D $ 31 4,809 D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Non-Qualified Stock Option(right to buy) $ 12.1 09/24/2007   M     277 (1) 05/31/2001 05/31/2011 Common Stock 277 $ 0 87,528 D  
Non-Qualified Stock Option(right to buy) $ 12.1 09/24/2007   M     277 (1) 05/31/2001 05/31/2011 Common Stock 277 $ 0 87,251 D  
Non-Qualified Stock Option(right to buy) $ 12.1 09/24/2007   M     56 (1) 05/31/2001 05/31/2011 Common Stock 56 $ 0 87,195 D  
Non-Qualified Stock Option(right to buy) $ 12.1 09/24/2007   M     390 (1) 05/31/2001 05/31/2011 Common Stock 390 $ 0 86,805 D  
Non-Qualified Stock Option(right to buy) $ 12.1 09/24/2007   M     334 (1) 05/31/2001 05/31/2011 Common Stock 334 $ 0 86,471 D  
Non-Qualified Stock Option(right to buy) $ 12.1 09/24/2007   M     277 (1) 05/31/2001 05/31/2011 Common Stock 277 $ 0 86,194 D  
Non-Qualified Stock Option(right to buy) $ 12.1 09/24/2007   M     277 (1) 05/31/2001 05/31/2011 Common Stock 277 $ 0 85,917 D  
Non-Qualified Stock Option(right to buy) $ 12.1 09/24/2007   M     556 (1) 05/31/2001 05/31/2011 Common Stock 556 $ 0 85,361 D  
Non-Qualified Stock Option(right to buy) $ 12.1 09/24/2007   M     277 (1) 05/31/2001 05/31/2011 Common Stock 277 $ 0 85,084 D  
Non-Qualified Stock Option(right to buy) $ 12.1 09/24/2007   M     389 (1) 05/31/2001 05/31/2011 Common Stock 389 $ 0 84,695 D  
Non-Qualified Stock Option(right to buy) $ 12.1 09/24/2007   M     999 (1) 05/31/2001 05/31/2011 Common Stock 999 $ 0 83,696 D  
Non-Qualified Stock Option(right to buy) $ 12.1 09/24/2007   M     381 (1) 05/31/2001 05/31/2011 Common stock 381 $ 0 83,315 D  
Non-Qualified Stock Option(right to buy) $ 12.1 09/24/2007   M     8 (1) 05/31/2001 05/31/2011 Common Stock 8 $ 0 83,307 D  
Non-Qualified Stock Option(right to buy) $ 12.1 09/24/2007   M     423 (1) 05/31/2001 05/31/2011 Common Stock 423 $ 0 82,884 D  
Non-Qualified Stock Option(right to buy) $ 14.82 09/24/2007   M     408 (1) 02/21/2002 02/21/2012 Common Stock 408 $ 0 39,592 D  
Non-Qualified Stock Option(right to buy) $ 14.82 09/24/2007   M     576 (1) 02/21/2002 02/21/2012 Common Stock 576 $ 0 39,016 D  
Non-Qualified Stock Option(right to buy) $ 14.82 09/24/2007   M     1,349 (1) 02/21/2002 02/21/2012 Common Stock 1,349 $ 0 37,667 D  
Non-Qualified Stock Option(right to buy) $ 14.82 09/24/2007   M     639 (1) 02/21/2002 02/21/2012 Common stock 639 $ 0 37,028 D  
Non-Qualified Stock Option(right to buy) $ 14.82 09/24/2007   M     364 (1) 02/21/2002 02/21/2012 Common Stock 364 $ 0 36,664 D  
Non-Qualified Stock Option(right to buy) $ 14.82 09/24/2007   M     111 (1) 02/21/2002 02/21/2012 Common stock 111 $ 0 36,553 D  
Non-Qualified Stock Option(right to buy) $ 14.82 09/24/2007   M     944 (1) 02/21/2002 02/21/2012 Common Stock 944 $ 0 35,609 D  
Non-Qualified Stock Option(right to buy) $ 14.82 09/24/2007   M     110 (1) 02/21/2002 02/21/2012 Common Stock 110 $ 0 35,499 D  
Non-Qualified Stock Option(right to buy) $ 14.82 09/24/2007   M     389 (1) 02/21/2002 02/21/2012 Common Stock 389 $ 0 35,110 D  
Non-Qualified Stock Option(right to buy) $ 14.82 09/24/2007   M     944 (1) 02/21/2002 02/21/2012 Common stock 944 $ 0 34,116 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Bell Derek
C/O POWER INTEGRATIONS
5245 HELLYER AVE
SAN JOSE, CA 95138		       VP of Engineering  

Signatures

 /s/ Rafael Torres Attorney-In-Fact for Derek Bell   09/26/2007
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) This sale is pursuant to a 10b5-1 Sales Plan.

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