www.powerint.com

A

9/02

DI-26

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 2002, 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

• Safety Y1 capacitor C15 is connected between secondary

return and primary DC rail to minimize noise coupling

during AC common mode line transients.

• Good layout practices should be followed:

- Locate C13, R11 and C14 close to U1, with grounds

returned to the SOURCE pin.

-Minimize the primary and secondary loop areas to

reduce parasitic leakage inductance, improve EMI and

cross-regulation.

Figure 3. Conducted EMI, 230 VAC, Full Power, Output Earth

Grounded.

5

4

3

2

1

0

-1

-2

-3

-4

-5

190

250

270

210

230

Line Voltage (VAC)

2.5 V

3.3 V

6.2 V

3.0 V

Figure 2. Full Power Line Regulation.

-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

Table 1. Transformer Construction Information.

Table 2. Worst Case Output Cross-Regulation-all Outputs Taken

from Minimum to Maximum Load.

Voltage

(V)

Load

Range

(%)

2.5

10-100

3.3

10-100

6.2

10-100

30

100

Regulation (%)

-10 -7

-4

-3

-2-1

0

1

2

3

4

7

TRANSFORMER PARAMETERS

Core Material

Bobbin

EF16-8 pin

Winding Details

Primary: 105T, 35 AWG

Bias: 17T, 35 AWG

3.3 V Secondary: 4T, 4 x 26 AWG T.I.W.

6.2 V Secondary: 3T, 26 AWG T.I.W.

30 V Secondary: 29T, 30 AWG T.I.W.

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

Inductance

Primary: 2.1 mH ± 10%, Leakge: 50 µH (max.)

Primary Resonant

Frequency

650 kHz (minimum)

Winding Order

(Pin Numbers)

Primary (1-2), Tape, Bias (3-4),

Tape, 3.3 V (5-6), 5 V (6-7), 30 V (7-8)