AN2173 datasheet(1/15 Pages) STMICROELECTRONICS

Part #	AN2173

Description	Using a VIPer12-based Power Supply to Replace a Wall Transformer

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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1 / 15 page

Rev 1.0

November 2005

1/15

15

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 95VAC to 135VAC; and 190VAC to 270VAC,

■ 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

AN2173

APPLICATION NOTE

Using a VIPer12-based Power Supply

to Replace a Wall Transformer

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