Design Example Report
0.5W Non-Isolated Buck-Boost Converter
using the LNK302P
Title
Input: 85-265 VAC
Output: 0.5W, 40mA Constant current
Specification
Application
Author
LED Driver
Power Integrations Applications Department
Document
Number
DER-92
Date
August 11, 2005
1.0
Revision
Summary and Features
• Low component count (only 9 components required)
• Low Cost, light weight, compact solution
• No Opto-Coupler required
• Open loop operation
• High efficiency (~70%)
• Meets EN55022 B EMI limits with > 8 dB margin
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.
Power Integrations
5245 Hellyer Avenue, San Jose, CA 95138 USA.
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com