AN4165 datasheet(1/37 Pages) STMICROELECTRONICS

Part #	AN4165

Description	This document describes a 12 V - 1 A power supply set in non-isolated flyback topology

PDF	37 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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February 2013

Doc ID 023661 Rev 1

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AN4165

Application note

STEVAL-ISA111V1: 12 V/12 W, 115 kHz non-isolated flyback

based on the VIPER26

By Mirko Sciortino

Introduction

This document describes a 12 V - 1 A power supply set in non-isolated flyback topology

based on the VIPER26, an offline high-voltage converter offered by STMicroelectronics.

The features of the device include:

■ 800 V avalanche rugged power section

■ PWM operation at 115 kHz with frequency jittering for lower EMI

■ Limiting current with adjustable set point

■ On-board soft-start

■ Safe behavior during a fault condition (overload, short-circuit, open loop)

■ Low standby consumption (< 30 mW at VIN = 230 VAC)

The available protections are:

■ Thermal shutdown with hysteresis

■ Delayed overload (or short-circuit) protection

■ Open loop failure protection

All protections employ the auto-restart mode.

Figure 1.

STEVAL-ISA111V1 demonstration board

www.st.com

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