www.powerint.com

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5/03

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For the latest updates, visit our Web site: www.powerint.com

Power Integrations reserves the right to make changes to its products at any time to improve reliability or manufacturability.

Power Integrations does not assume any liability arising from the use of any device or circuit described herein, nor does it convey any

license under its patent rights or the rights of others. The products and applications illustrated herein may be covered by one or more U.S.

and foreign patents or potentially by pending U.S. and foreign patent applications assigned to Power Integrations. A complete list of Power

Integrations’ patents may be found at www.powerint.com.

The PI Logo, TOPSwitch, TinySwitch and EcoSmart are registered trademarks of Power Integrations, Inc.

PI Expert is a trademark of Power Integrations, Inc. ©Copyright 2003, Power Integrations, Inc.

WORLD HEADQUARTERS

AMERICAS

Power Integrations, Inc.

San Jose, CA 95138 USA

Customer Service:

Phone:

+1 408-414-9665

Fax:

+1 408-414-9765

e-mail: usasales@powerint.com

CHINA

Power Integrations International

Holdings, Inc.

China

Phone:

+86-755-8367-5143

Fax:

+86-755-8377-9610

e-mail: chinasales@powerint.com

SINGAPORE

Power Integrations, Singapore

Republic of Singapore 308900

Phone:

+65-6358-2160

Fax:

+65-6358-2015

e-mail: singaporesales@powerint.com

JAPAN

Power Integrations, K.K.

Keihin-Tatemono 1st Bldg.

Japan

Phone:

+81-45-471-1021

Fax:

+81-45-471-3717

e-mail: japansales@powerint.com

EUROPE & AFRICA

Power Integrations (Europe) Ltd.

United Kingdom

Phone:

+44-1344-462-300

Fax:

+44-1344-311-732

e-mail: eurosales@powerint.com

KOREA

Power Integrations

International Holdings, Inc.

Seoul, Korea

Phone:

+82-2-782-2840

Fax:

+82-2-782-4427

e-mail: koreasales@powerint.com

TAIWAN

Power Integrations

International Holdings, Inc.

Taipei, Taiwan

Phone:

+886-2-2727-1221

Fax:

+886-2-2727-1223

e-mail: taiwansales@powerint.com

INDIA (Technical Support)

Innovatech

Bangalore, India

Phone:

+91-80-226-6023

Fax:

+91-80-228-9727

e-mail: indiasales@powerint.com

APPLICATIONS HOTLINE

APPLICATIONS FAX

World Wide +1-408-414-9660

World Wide +1-408-414-9760

Figure 2. 115 V Conducted EMI for LCD Monitor Supply. Meets

FCC Part 15 Class B.

Figure 3. 230 V Conducted EMI for LCD Monitor Supply. Meets

EN55022 EMI spec.

-20

-10

0

-10

20

30

40

50

60

70

80

0.15

1

10

30

Frequency (MHz)

EN_V_QP

EN_V_AV

QP Limit Line

Quasi-Peak Scan

Average Scan

AV Limit Line

-20

-10

0

-10

20

30

40

50

60

70

80

0.15

1

10

30

Frequency (MHz)

EN_V_QP

EN_V_AV

QP Limit Line

Quasi-Peak Scan

Average Scan

AV Limit Line

• Capacitor C12 is added to eliminate output start-up

overshoot.

• Feedback compensation is accomplished with C11 and

R12 across TL431 reference amplifier U3 and correct

choice of optocoupler series resistor R10.

Table 1. Transformer Construction Information.

TRANSFORMER PARAMETERS

Core Material

EE30

TDK PC40EE30-Z or equivalent,

Gap for A

2

Bobbin

E130 12 pin

(Yih Hwa YW-016 or equivalent)

Winding Details

Tape, Shield (2-3), Tape, Primary

(4-1), Tape, Bias (6-5), Tape,

Secondary

(7,8,9-10,11,12), Tape

Inductance

Primary: 490 µH ± 10%,

Leakage: 6 µH (maximum)

Primary Resonant Frequency

2 MHz (minimum)

Winding Order

(Pin Numbers)

Shield: 10T, 2 x 28 AWG

Primary: 22T, 25 AWG

Bias: 3T, 4 x 28 AWG

Secondary: 3T, 5 x 25 AWG T.I.W.

(T.I.W. = Triple Insulated Wire)