DER-56
UPS Battery Charger - LNK520
April 20, 2005
1 Introduction
This document is an engineering prototype report describing a +12V 400mA charger
power supply. The power supply utilizes the LinkSwitch LNK520 device. The LinkSwitch
integrates a 700V MOSFET, PWM controller, high-voltage start-up, thermal shutdown,
and fault protection circuitry. This power supply is a cost effective replacement of linear
transformer based power supplies with the additional features of universal input voltage
range and high-energy efficiency.
The document contains the power supply specification, schematic, bill of materials,
transformer documentation, printed circuit layout, and performance data.
Figure 1 – Populated Circuit Board Photograph
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
Page 3 of 24
www.powerint.com
POWERINT [ Power Integrations ]
