AN1514 Datasheet, PDF (1/17 Pages) STMicroelectronics – buck-boost converter using VIPer12A-E/22A-E

AN1514
Application note
VIPower: double output buck or
buck-boost converter using VIPer12A-E/22A-E
Introduction
This paper introduces two double output off-line non isolated SMPS based on the
VIPerX2A-E family. The first SMPS is a Buck converter with two positive outputs and the
second one is a Buck-Boost converter with two negative outputs. The use of VIPer12A-E or
VIPer22A-E in both converters depends on the output power specifications. The power
supplies are operated in off-line mode with an extended wide range of the input voltage,
from 80 to 285 Vac. The target applications are small loads, such as microcontrollers,
motors, displays and peripherals in several industrial and home appliances.
Two converter topologies are introduced in this paper. The considered double output
converters are based on the VIPerX2A-E device family and are suitable for non isolated off-
line applications. VIPerX2A-E is a low cost monolithic smart power with a PWM controller,
start-up circuit and protection integrated on the same chip. The power stage consists of a
vertical Power MOSFET with 730 V breakdown voltage and 0.32 A for VIPer12A-E or 0.56 A
for VIPer22A-E maximum drain current with internal limitation.
The use of a VIPower device makes the design very simple and easy, since several features
are integrated in the smart power IC. The first SMPS is a Buck converter with two positive
outputs and the second one is a Buck-Boost converter with two negative outputs. The use of
VIPer12A-E or VIPer22A-E in both converters depends on the output power specifications.
The power supplies are operated in off-line mode with an extended wide range of the input
voltage, from 80 to 285 Vac.
The target applications are small loads, such as microcontrollers, motors, displays and
peripherals in several industrial and home appliances with power level up to 6-8 W.
September 2007
Rev 2
1/17
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