www.powerint.com

B

5/03

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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

Core

Bobbin

Winding Order

(pin numbers)

Primary Inductance

(Pins 1-4 all others open)

Primary Resonant

Frequency (Pins 1-4, all

other open)

Leakage Inductance

(Pins 1-4, with Pins 8-14

shorted)

TRANSFORMER PARAMETERS

Table 1. Transformer Design Parameters.

EE16, Nippon Ceramic NC-2H or

equivalent, A

2

EEL16 Vertical

Shield (1-NC), Primary (4-1), Shield

(3-2), and Secondary (10-8).

1660 µH ±10%

400 kHz (minimum)

70 µH (maximum)

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 (including circuits external to the

products and transformer construction) 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, LinkSwitch and EcoSmart are registered trademarks of Power Integrations, Inc.

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

Figure 3. Conducted Emissions–EN55022 Class B (QP and AVG),

5 V, 1 A, 230 VAC, with Artificial Hand Connected to

Secondary Return.

Figure 2. No-load Input Power Consumption.

Key Design Points

• Use K

0.6 and V

OR

(output reflected voltage) of 90 V to

110 V for best efficiency.

• Use low cost optocoupler - gain is non-critical.

• PCB traces which carry high switching voltages and current

should be short and wide to reduce EMI.

• Reduce leakage inductance by filling each winding layer

across the entire width of the bobbin.

• R4 should be large enough to limit dissipation, to meet

<300 mW no-load target, while still limiting peak DRAIN

voltage to a safe value – 200 k

Ω is a good start value for

most designs.

•A layer of insulation tape between each layer of primary

winding will further reduce inter-winding capacitance and

therefore switching losses.

• Ferrite bead L2 reduces radiated EMI.

50

150

200

250

100

300

Input Voltage (VAC)

150

100

50

0

200

250

300

1.0

0.15

10.0

-100.0

-20

-10

0

10

20

30

40

50

60

80

70

Frequency (MHz)

QP

AV

Average

Quasi Peak