AN4164 Datasheet, PDF (1/38 Pages) STMicroelectronics – This document describes a 12 V-350 mA power supply set in non-isolated flyback topology

AN4164
Application note
STEVAL-ISA113V1: 12 V/4 W, 115 kHz non-isolated flyback
By Mirko Sciortino
Introduction
This document describes a 12 V-350 mA power supply set in non-isolated flyback topology
with the new VIPer06 offline high voltage converter by STMicroelectronics.
The features of the device are:
■ 800 V avalanche rugged power section
■ PWM operation at 115 kHz with frequency jittering for lower EMI
■ Limiting current with adjustable set point
■ Onboard soft-start
■ Safe auto-restart after a fault condition (overload, short-circuit)
■ SSO-10 package
Moreover, the VIPER06 does not require a biasing circuit to operate because the IC can be
supplied by an internal current generator, therefore saving the cost of the transformers
auxiliary winding (self-biasing). If the device is biased through an auxiliary winding or
through a diode connected to the output (external biasing), it can reach very low standby
consumption (< 50 mW at 265 V_AC).
Both cases are treated in the present document.
The available protection features are: thermal shutdown with hysteresis, delayed overload
protection, and open loop failure protection (the last is available only if the IC is externally
biased).
Figure 1. Demonstration board image
February 2013
Doc ID 023660 Rev 1
1/38
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