Design Example Report
Title
2.25W Power Supply using LNK520P
Input: 90 – 265 Vac
Specification
Output: 4.5V / 0.5A
Application
Author
Document
Number
Date
Revision
Portable CD player with AM/FM Radio
Power Integrations Applications Department
DER-42
November 18, 2004
1.0
Summary and Features
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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%
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
Power Integrations
5245 Hellyer Avenue, San Jose, CA 95138 USA.
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
POWERINT [ POWER INTEGRATIONS, INC. ]
