AN2173 Datasheet, PDF (1/15 Pages) STMicroelectronics – Using a VIPer12-based Power Supply to Replace a Wall Transformer

AN2173
APPLICATION NOTE
Using a VIPer12-based Power Supply
to Replace a Wall Transformer
Introduction
This application note describes a power supply that can be used as a wall transformer replacement or as
a power module for a small consumer appliance. The design objectives are:
■ The outside case dimensions (in inches) are 2L x 2W x 1H, with smaller inside dimensions,
■ the Line and Neutral pins (of equal size and 8mm from the end of the assembly) are attached to the
case,
■ the input voltage ranges are 95V_AC to 135V_AC; and 190V_AC to 270V_AC,
■ the output voltage is 15V (max) at 1mA (min) and is 12V (min) at 500mA (max), with a 50% duty cycle,
■ the ambient temperature range is –5°C to 55°C, and
■ the Electromagnetic Interference (EMI) is measured for all loads.
The power supply for the wall transformer replacement application consists primarily of a re-packaged
VIPer12 Demonstration Board (12V, single output voltage, see Application Note AN1734 for details).
Figure 1. VIPer12-based Power Supply Assembly, Top View
November 2005
Rev 1.0
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