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

20W Dual Output Power Supply using

TOP247Y

Specification

Input: 85-265 VAC

Output: 12V/1.25A, -14V/0.4A

Application

Cooking Range

Author

Power Integrations Applications Department

Document

Number

DER-53

Date

April 20, 2005

Revision

1.0

Summary and Features

This document is an engineering prototype report describing a 20W power supply

utilizing a TOP247Y. This power supply will be used in a cook top application where the

maximum ambient temperature can reach 105C.

• 105C Ambient Operation

• TOP247Y operates at 66kHz to reduce switching losses and EMI filter size

• Compact PCB 7” X 3”

• High efficiency >85% at full load

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.