POWER INTEGRATIONS INC
SC 13G, 1998-02-17
SEMICONDUCTORS & RELATED DEVICES
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  Schedule 13G
                                 (Rule 13d-102)

        INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES
      13d-1 (b) AND (c) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2 (b)
                             (Amendment No._______)*


                            Power Integrations, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                    739276103
- --------------------------------------------------------------------------------
                                 (CUSIP Number)


*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).

                         (Continued on following pages)


                               Page 1 of 12 Pages
                       Exhibit Index Contained on Page 11

<PAGE>


<TABLE>
<CAPTION>
<S>                                                             <C>          <C>
- --------------------------------------------------------                     ---------------------------------------
CUSIP NO. 739276103                                             13 G                   Page 2 of 12 Pages
- --------------------------------------------------------                     ---------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

                     Mohr, Davidow Ventures II, A California Limited Partnership  ("MDV II")
                     Tax ID Number:    94-3037255
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)  [ ]         (b)  [ ]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
4           CITIZENSHIP OR PLACE OF ORGANIZATION

                     California
- ----------- --------------------------------------------------------------------------------------------------------
         NUMBER OF SHARES           5        SOLE VOTING POWER
    BENEFICIALLY OWNED BY EACH               1,019,777 shares, except that WHD/LGM Partners,  the general partner of
            REPORTING                        MDV II, and Messrs.  Mohr, Davidow, and Feiber, the general partners of
           PERSON WITH                       WHD/LGM  Partners,  may be deemed to have  shared  power to vote  these
                                             shares.
                                    -------- -----------------------------------------------------------------------
                                    6        SHARED VOTING POWER
                                             See response to row 5.
                                    -------- -----------------------------------------------------------------------
                                    7        SOLE DISPOSITIVE POWER
                                             1,019,777 shares, except that WHD/LGM Partners,  the general partner of
                                             MDV II, and Messrs.  Mohr, Davidow, and Feiber, the general partners of
                                             WHD/LGM  Partners,  may be deemed to have  shared  power to  dispose of
                                             these shares.
                                    -------- -----------------------------------------------------------------------
                                    8        SHARED DISPOSITIVE POWER
                                             See response to row 7.
- ----------------------------------- -------- -----------------------------------------------------------------------
9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
            REPORTING PERSON                                                                       1,019,777
- ----------- --------------------------------------------------------------------------------------------------------
10          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
            EXCLUDES CERTAIN SHARES*                                                                [ ]
- ----------- --------------------------------------------------------------------------------------------------------
11          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                   8.89%
- ----------- --------------------------------------------------------------------------------------------------------
12          TYPE OF REPORTING PERSON*
                                                                                                   PN
- ----------- --------------------------------------------------------------------------------------------------------

<FN>
                                       * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>


<TABLE>
<CAPTION>
<S>                                                             <C>          <C>
- --------------------------------------------------------                     ---------------------------------------
CUSIP NO. 739276103                                             13 G                   Page 3 of 12 Pages
- --------------------------------------------------------                     ---------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

                     WHD/LGM Partners, A California Limited Partnership  ("WHD/LGM Partners")
                     Tax ID Number:    94-3035845
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)  [ ]         (b)  [ ]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
4           CITIZENSHIP OR PLACE OF ORGANIZATION

                     California
- ----------- --------------------------------------------------------------------------------------------------------
         NUMBER OF SHARES           5        SOLE VOTING POWER
    BENEFICIALLY OWNED BY EACH               0 shares
            REPORTING
           PERSON WITH
                                    -------- -----------------------------------------------------------------------
                                    6        SHARED VOTING POWER
                                             1,019,777  shares,  of which all are directly  owned by MDV II. WHD/LGM
                                             Partners  is the  general  partner  of MDV II and may be deemed to have
                                             shared power to vote these shares.
                                    -------- -----------------------------------------------------------------------
                                    7        SOLE DISPOSITIVE POWER
                                             0 shares
                                    -------- -----------------------------------------------------------------------
                                    8        SHARED DISPOSITIVE POWER
                                             1,019,777  shares,  of which all are directly  owned by MDV II. WHD/LGM
                                             Partners  is the  general  partner  of MDV II and may be deemed to have
                                             shared power to dispose of these shares.
- ----------------------------------- -------- -----------------------------------------------------------------------
9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
            REPORTING PERSON                                                                       1,019,777
- ----------- --------------------------------------------------------------------------------------------------------
10          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
            EXCLUDES CERTAIN SHARES*                                                           [ ]
- ----------- --------------------------------------------------------------------------------------------------------
11          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                   8.89%
- ----------- --------------------------------------------------------------------------------------------------------
12          TYPE OF REPORTING PERSON*
                                                                                                   PN
- ----------- --------------------------------------------------------------------------------------------------------

<FN>
                                       * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>


<TABLE>
<CAPTION>
<S>                                                             <C>          <C>
- --------------------------------------------------------                     ---------------------------------------
CUSIP NO. 739276103                                             13 G                   Page 4 of 12 Pages
- --------------------------------------------------------                     ---------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

                     Lawrence G. Mohr, Jr.  ("Mohr")
                     Tax ID Number:    ###-##-####
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)  [ ]         (b)  [ ]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
4           CITIZENSHIP OR PLACE OF ORGANIZATION

                     U.S. Citizen
- ----------- --------------------------------------------------------------------------------------------------------
         NUMBER OF SHARES           5        SOLE VOTING POWER
    BENEFICIALLY OWNED BY EACH               0 shares
            REPORTING
           PERSON WITH
                                    -------- -----------------------------------------------------------------------
                                    6        SHARED VOTING POWER
                                             1,019,777  shares, of which all are directly owned by MDV II. Mohr is a
                                             general partner of WHD/LGM Partners, the general partner of MDV II, and
                                             may be deemed to have shared power to vote these shares.
                                    -------- -----------------------------------------------------------------------
                                    7        SOLE DISPOSITIVE POWER
                                             0 shares
                                    -------- -----------------------------------------------------------------------
                                    8        SHARED DISPOSITIVE POWER
                                             1,019,777  shares, of which all are directly owned by MDV II. Mohr is a
                                             general partner of WHD/LGM Partners, the general partner of MDV II, and
                                             may be deemed to have shared power to dispose of these shares.
- ----------------------------------- -------- -----------------------------------------------------------------------
9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
            REPORTING PERSON                                                                       1,019,777
- ----------- --------------------------------------------------------------------------------------------------------
10          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
            EXCLUDES CERTAIN SHARES*                                                                 [ ]
- ----------- --------------------------------------------------------------------------------------------------------
11          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                   8.89%
- ----------- --------------------------------------------------------------------------------------------------------
12          TYPE OF REPORTING PERSON*
                                                                                                   IN
- ----------- --------------------------------------------------------------------------------------------------------

<FN>
                                       * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>


<TABLE>
<CAPTION>
<S>                                                             <C>          <C>
- --------------------------------------------------------                     ---------------------------------------
CUSIP NO. 739276103                                             13 G                   Page 5 of 12 Pages
- --------------------------------------------------------                     ---------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

                     William H. Davidow  ("Davidow")
                     Tax ID Number:    ###-##-####
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)  [ ]         (b)  [ ]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
4           CITIZENSHIP OR PLACE OF ORGANIZATION

                     U.S. Citizen
- ----------- --------------------------------------------------------------------------------------------------------
         NUMBER OF SHARES           5        SOLE VOTING POWER
    BENEFICIALLY OWNED BY EACH               15,000 shares, issuable upon the exercise of stock options.
            REPORTING
           PERSON WITH
                                    -------- -----------------------------------------------------------------------
                                    6        SHARED VOTING POWER
                                             1,019,777 shares, of which all are directly owned by MDV II. Davidow is
                                             a general partner of WHD/LGM  Partners,  the general partner of MDV II,
                                             and may be deemed to have shared power to vote these shares.
                                    -------- -----------------------------------------------------------------------
                                    7        SOLE DISPOSITIVE POWER
                                             15,000 shares, issuable upon the exercise of stock options.
                                    -------- -----------------------------------------------------------------------
                                    8        SHARED DISPOSITIVE POWER
                                             1,019,777 shares, of which all are directly owned by MDV II. Davidow is
                                             a general partner of WHD/LGM  Partners,  the general partner of MDV II,
                                             and may be deemed to have shared power to dispose of these shares.
- ----------------------------------- -------- -----------------------------------------------------------------------
9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
            REPORTING PERSON                                                                       1,034,777
- ----------- --------------------------------------------------------------------------------------------------------
10          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
            EXCLUDES CERTAIN SHARES*                                                                [ ]
- ----------- --------------------------------------------------------------------------------------------------------
11          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                   9.02%
- ----------- --------------------------------------------------------------------------------------------------------
12          TYPE OF REPORTING PERSON*
                                                                                                   IN
- ----------- --------------------------------------------------------------------------------------------------------

<FN>
                                       * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>


<TABLE>
<CAPTION>
<S>                                                             <C>          <C>
- --------------------------------------------------------                     ---------------------------------------
CUSIP NO. 739276103                                             13 G                   Page 6 of 12 Pages
- --------------------------------------------------------                     ---------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

                     Jonathan D. Feiber  ("Feiber")
                     Tax ID Number:    ###-##-####
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)  [ ]         (b)  [ ]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
4           CITIZENSHIP OR PLACE OF ORGANIZATION

                     U.S. Citizen
- ----------- --------------------------------------------------------------------------------------------------------
         NUMBER OF SHARES           5        SOLE VOTING POWER
    BENEFICIALLY OWNED BY EACH               0 shares
            REPORTING
           PERSON WITH
                                    -------- -----------------------------------------------------------------------
                                    6        SHARED VOTING POWER
                                             1,019,777  shares, of which all are directly owned by MDV II. Feiber is
                                             a general partner of WHD/LGM  Partners,  the general partner of MDV II,
                                             and may be deemed to have shared power to vote these shares.
                                    -------- -----------------------------------------------------------------------
                                    7        SOLE DISPOSITIVE POWER
                                             0 shares
                                    -------- -----------------------------------------------------------------------
                                    8        SHARED DISPOSITIVE POWER
                                             1,019,777  shares, of which all are directly owned by MDV II. Feiber is
                                             a general partner of WHD/LGM  Partners,  the general partner of MDV II,
                                             and may be deemed to have shared power to dispose of these shares.
- ----------- --------------------------------------------------------------------------------------------------------
9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
            REPORTING PERSON                                                                       1,019,777
- ----------- --------------------------------------------------------------------------------------------------------
10          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
            EXCLUDES CERTAIN SHARES*                                                                [ ]
- ----------- --------------------------------------------------------------------------------------------------------
11          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                   8.89%
- ----------- --------------------------------------------------------------------------------------------------------
12          TYPE OF REPORTING PERSON*
                                                                                                   IN
- ----------- --------------------------------------------------------------------------------------------------------

<FN>
                                       * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>


                                                              Page 7 of 12 Pages

ITEM 1(a).        NAME OF ISSUER:

                  Power Integrations, Inc.

ITEM 1(b).        ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

                  477 N. Mathilda Avenue
                  Sunnyvale, CA 94086
                  (408) 523-9200

ITEM 2(a).        NAME OF PERSON FILING:

                  This  statement  is  filed  by Mohr,  Davidow  Ventures  II, A
                  California Limited Partnership ("MDV II"), WHD/LGM Partners, A
                  California Limited Partnership ("WHD/LGM Partners"),  Lawrence
                  G. Mohr, Jr.  ("Mohr"),  William H. Davidow  ("Davidow"),  and
                  Jonathan D. Feiber  ("Feiber").  The  foregoing  entities  and
                  individuals  are  collectively  referred to as the  "Reporting
                  Persons".

                  WHD/LGM  Partners is the general partner of MDV II, and may be
                  deemed  to have  shared  power  to vote  and  shared  power to
                  dispose  of shares  of the  issuer  directly  owned by MDV II.
                  Mohr, Davidow,  and Feiber are the general partners of WHD/LGM
                  Partners,  and may be deemed to have shared  power to vote and
                  shared power to dispose of the shares of issuer directly owned
                  by MDV II.

ITEM 2(b).        ADDRESS OF PRINCIPAL BUSINESS OFFICE, OR, IF NONE, RESIDENCE:

                  The address of the principal  business  office for each of the
                  Reporting Persons is:

                  Mohr, Davidow Ventures
                  2775 Sand Hill Road, Suite 240
                  Menlo Park, CA 94025

ITEM 2(c)         CITIZENSHIP:

                  MDV  II  and   WHD/LGM   Partners   are   California   limited
                  partnerships and Mohr,  Davidow,  and Feiber are United States
                  citizens.

ITEM 2(d).        TITLE OF CLASS OF SECURITIES:

                  Common Stock

ITEM 2(e).        CUSIP NUMBER:

                  739276103

ITEM 3.           Not Applicable



<PAGE>


                                                              Page 8 of 12 Pages

ITEM 4.           OWNERSHIP:

                  The following information with respect to the ownership of the
                  Common  Stock  of  the  issuer  by  the  persons  filing  this
                  Statement is provided as of December 31, 1997:

                     (a)   Amount beneficially owned:

                           See Row 9 of cover page for each Reporting Person.

                     (b)   Percent of Class:

                           See Row 11 of cover page for each Reporting Person.

                     (c)   Number of shares as to which  such  person  has:  

                                 (i)   Sole power to vote or to direct the vote:

                                       See  Row  5  of   cover   page  for  each
                                       Reporting Person.

                                 (ii)  Shared  power  to vote or to  direct  the
                                       vote:

                                       See  Row  6  of   cover   page  for  each
                                       Reporting Person.

                                 (iii) Sole  power to  dispose  or to direct the
                                       disposition of:

                                       See  Row  7  of   cover   page  for  each
                                       Reporting Person.

                                 (iv)  Shared  power to dispose or to direct the
                                       disposition of:

                                       See  Row  8  of   cover   page  for  each
                                       Reporting Person.


<PAGE>


                                                              Page 9 of 12 Pages

ITEM 5.           OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS:

                  Not applicable.

ITEM 6.           OWNERSHIP  OF MORE THAN  FIVE  PERCENT  ON  BEHALF OF  ANOTHER
                  PERSON:

                  Under   certain   circumstances   set  forth  in  the  limited
                  partnership  agreements  of MDV II and WHD/LGM  Partners,  the
                  general and limited  partners of each of such  entities may be
                  deemed to have the right to  receive  dividends  from,  or the
                  proceeds  from, the sale of shares of the issuer owned by each
                  such entity of which they are a partner.


ITEM 7.           IDENTIFICATION  AND  CLASSIFICATION  OF THE  SUBSIDIARY  WHICH
                  ACQUIRED THE SECURITY  BEING REPORTED ON BY THE PARENT HOLDING
                  COMPANY:

                  Not applicable.

ITEM 8.           IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP:

                  Not applicable

ITEM 9.           NOTICE OF DISSOLUTION OF GROUP:

                  Not applicable

ITEM 10.          CERTIFICATION:

                  Not applicable



<PAGE>


                                                             Page 10 of 12 Pages

                                   SIGNATURES

                  After  reasonable  inquiry and to the best of my knowledge and
belief,  I certify  that the  information  set forth in this  statement is true,
complete and correct.

Dated:  February 10, 1998



                                             /s/  William H. Davidow
                                          --------------------------------------
                                          William H. Davidow



                                             /s/  Jonathan D. Feiber
                                          --------------------------------------
                                          Jonathan D. Feiber,  individually  and
                                             on behalf of MDV II in his capacity
                                             as a  general  partner  of  WHD/LGM
                                             Partners,  the  general  partner of
                                             MDV II,  and on behalf  of  WHD/LGM
                                             Partners  in  his   capacity  as  a
                                             general partner thereof.



                                             /s/  Lawrence G. Mohr, Jr.
                                          --------------------------------------
                                          Lawrence G. Mohr, Jr.



<PAGE>


                                                             Page 11 of 12 Pages

                                  EXHIBIT INDEX


                                                                     Found on
                                                                   Sequentially
Exhibit                                                            Numbered Page

Exhibit A:  Agreement of Joint Filing                                   12



<PAGE>


                                                             Page 12 of 12 Pages

                                    EXHIBIT A

                            Agreement of Joint Filing

                  The  undersigned  hereby agree that a single  Schedule 13G (or
any amendment thereto) relating to the Common Stock of Power Integrations,  Inc.
shall be filed on behalf  of each of the  undersigned  and that  this  Agreement
shall be filed as an exhibit to such Schedule 13G.

Date:  February 10, 1998


                                             /s/  William H. Davidow            
                                          --------------------------------------
                                          William H. Davidow                    
                                                                                
                                                                                
                                                                                
                                             /s/  Jonathan D. Feiber            
                                          --------------------------------------
                                          Jonathan D. Feiber,  individually  and
                                             on behalf of MDV II in his capacity
                                             as a  general  partner  of  WHD/LGM
                                             Partners,  the  general  partner of
                                             MDV II,  and on behalf  of  WHD/LGM
                                             Partners  in  his   capacity  as  a
                                             general partner thereof.           
                                                                                
                                                                                
                                                                                
                                             /s/  Lawrence G. Mohr, Jr.         
                                          --------------------------------------
                                          Lawrence G. Mohr, Jr.                 
                                                                                




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