<PAGE>
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G Amendment
Under the Securities Exchange Act of 1934
(Amendment No. 1)*
Power Integrations Inc
--------------------------------------------------------------------------------
(Name of Issuer)
Common
--------------------------------------------------------------------------------
(Title of Class of Securities)
739276103
----------------------------------
(CUSIP Number)
June 30, 2000
--------------------------------------------------------------------------------
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:
/X/ Rule 13d-1(b)
/ / Rule 13d-1(c)
/ / Rule 13d-1(d)
*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 the disclosures provided in a prior cover page.
The information required in 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).
<PAGE>
CUSIP No. 739276103
---------
Common
-------------------------------------------------------------------------------
(1) Names of Reporting Persons.
I.R.S. Identification Nos. of above persons (entities only).
Nicholas-Applegate Capital Mgmt. 33-0124536
-------------------------------------------------------------------------------
(2) Check the Appropriate Box if a Member (a) / /
of a Group (See Instructions) (b) / /
-------------------------------------------------------------------------------
(3) SEC Use Only
-------------------------------------------------------------------------------
(4) Citizenship or Place of Organization
San Diego, California
-------------------------------------------------------------------------------
Number of Shares (5) Sole
313200
Owned by --------------------------------------------------
Each Reporting (6) Shared Voting Power
Person With: 0
--------------------------------------------------
(7) Sole Dispositive Power
313200
--------------------------------------------------
(8) Shared Dispositive Power
0
-------------------------------------------------------------------------------
(9) Aggregate Amount Beneficially Owned by Each Reporting Person
402800
-------------------------------------------------------------------------------
(10) Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
Instructions) / /
-------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)
1.48
-------------------------------------------------------------------------------
(12) Type of Reporting Person (See Instructions)
IA
-------------------------------------------------------------------------------
<PAGE>
ITEM 1.
(a) Name of Issuer
Power Integrations Inc
---------------------------------------------------------------------
(b) Address of Issuer's Principal Executive Offices
477 North Mathilda Avenue
Sunnyvale, CA 94086
---------------------------------------------------------------------
ITEM 2.
(a) Name of Person Filing
Nicholas-Applegate Capital Management
---------------------------------------------------------------------
(b) Address of Principal Business Office or, if none, Residence
600 West Broadway, 29 Floor, San Diego, CA 92101
---------------------------------------------------------------------
(c) Citizenship
Nicholas-Applegate Capital Management is a California Limited
Partnership.
---------------------------------------------------------------------
(d) Title of Class of Securities
Common
---------------------------------------------------------------------
(e) CUSIP Number
739276103
---------------------------------------------------------------------
ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO SECTIONS 240.13d-1(b) OR
240.13d-2(b) OR (c), CHECK WHETHER THE PERSON FILING IS A:
(a) / / Broker or dealer registered under section 15 of the Act (15
U.S.C. 78o).
(b) / / Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).
(c) / / Insurance company as defined in section 3(a)(19) of the Act (15
U.S.C. 78c).
(d) / / Investment company registered under section 8 of the Investment
Company Act of 1940 (15 U.S.C. 80a-8).
(e) /X/ An investment adviser in accordance with section
240.13d-1(b)(1)(ii)(E).
(f) / / An employee benefit plan or endowment fund in accordance with
section 240.13d-1(b)(1)(ii)(F).
(g) / / A parent holding company or control person in accordance with
section 240.13d-1(b)(1)(ii)(G).
(h) / / A savings association as defined in section 3(b) of the Federal
Deposit Insurance Act (12 U.S.C. 1813).
(i) / / A church plan that is excluded from the definition of an
investment company under section 3(c)(14) of the Investment Company
Act of 1940 (15 U.S.C. 80a-3).
(j) / / Group, in accordance with section 240.13d-1(b)(1)(ii)(J).
<PAGE>
ITEM 4. OWNERSHIP
Provide the following information regarding the aggregate number and
percentage of the class of securities of the issuer identified in Item 1.
(a) Amount beneficially owned:
402800
---------------------------------------------------------------------------
(b) Percent of class:
1.48
---------------------------------------------------------------------------
(c) Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote
313200
-----------------------------------------------------------------
(ii) Shared power to vote or to direct the vote
0
-----------------------------------------------------------------
(iii) Sole power to dispose or to direct the disposition of
313200
-----------------------------------------------------------------
(iv) Shared power to dispose or to direct the disposition of
0
-----------------------------------------------------------------
ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS
If this statement is being filed to report the fact that as of the date
hereof the reporting person has ceased to be the beneficial owner of more than
five percent of the class of securities, check the following. X
ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON
ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED
THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY
ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP
ITEM 9. NOTICE OF DISSOLUTION OF GROUP
<PAGE>
ITEM 10. CERTIFICATION
(a) The following certification shall be included if the statement is filed
pursuant to section 240.13d-1(b):
By signing below I certify that, to the best of my knowledge and
belief, the securities referred to above were acquired and are
held in the ordinary course of business and were not acquired and
are not held for the purpose of or with the effect of changing or
influencing the control of the issuer of the securities and were
not acquired and are not held in connection with or as a
participant in any transaction having that purpose or effect.
(b) The following certification shall be included if the statement is filed
pursuant to section 240.13d-1(c):
By signing below I certify that, to the best of my knowledge and
belief, the securities referred to above were not acquired and
are not held for the purpose of or with the effect of changing or
influencing the control of the issuer of the securities and were
not acquired and are not held in connection with or as a
participant in any transaction having that purpose or effect.
SIGNATURE
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.
July 10, 2000
----------------------------------------
Date
Victoria P. Hulick
----------------------------------------
Signature
Director of Compliance
----------------------------------------
Name/Title
