Power Integrations

5245 Hellyer Avenue, San Jose, CA 95138 USA.

Tel: +1 408 414 9200 Fax: +1 408 414 9201

www.powerint.com

Design Example Report

Title

42W, 4 Output Supply using TOP245Y

Specification

Input: 230 VAC

Outputs: 5V/4A, 6.8V/1.8A, 12V/0.8A, -10V/0.1A

Application

Set Top Box w/Hard Drive

Author

Power Integrations Applications Department

Document

Number

DER-36

Date

April 27, 2004

Revision

1.0

Summary and Features

• High Efficiency (81% min)

• Low Parts Count

• Low Output Ripple

• Meets Conducted CISPR22B EMI with Margin

• Small Transformer (EER35)

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.