AN4165 Datasheet, PDF (1/37 Pages) STMicroelectronics – This document describes a 12 V - 1 A power supply set in non-isolated flyback topology

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 V_IN = 230 V_AC)
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
February 2013
Doc ID 023661 Rev 1
1/37
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