AN1934 Datasheet, PDF (1/32 Pages) STMicroelectronics – This circuit can be used to produce multiple outputs

AN1934
Application note
VIPower™: the VIPer12A-E non-isolated flyback converter
reference board
Introduction
This circuit can be used to produce multiple outputs, non-isolated positive or negative
voltage. It is dedicated for an auxiliary power supply based on the VIPer12A-E monolithic
device.
The aim of this reference board is to propose a solution of the power supply based on an
offline discontinuous current mode flyback converter without isolation between input and
output. The flyback topology allows the current capability of the monolithic device VIPer12A-
E to be exploited when compared with the buck converter based on the power supply. To
ensure low cost of the whole power supply, the isolation between input and output is not
provided. This simplifies the transformer design and production. The VIPer12A-E
incorporates the PWM controller with 60 kHz internal oscillator and altogether with the
vertical power MOSFET switch in the SO-8 package. The presented power supply has four
variants, which are included in this reference board thanks to different assembly options.
November 2014
DocID10353 Rev 2
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