Design Example Report

Title

2.25W Power Supply using LNK520P

Specification

Input: 90 – 265 Vac

Output: 4.5V / 0.5A

Application

Portable CD player with AM/FM Radio

Author

Power Integrations Applications Department

Document

Number

DER-42

Date

November 18, 2004

Revision

1.0

Summary and Features

• Very low No Load Input Power - less than 80 mW @ 100 Vac.

• Low RFI allows good AM radio reception with very little interference

• Meets EMI, EN55022 B with no Y1 capacitor.

• Good voltage regulation with no optocoupler

• Lightweight solution for portable applications

• Ideal replacement for linear adapters

• Average efficiency @ 120 VAC greater than 70%

Power Integrations

5245 Hellyer Avenue, San Jose, CA 95138 USA.

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

www.powerint.com

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.