For further information contact your local STMicroelectronics sales office.

January 2013

Doc ID 024066 Rev 1

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STEVAL-ISA121V1

Wide range single-output demonstration board

based on the VIPER37LE

Data brief

Features

– frequency 45 - 65 Hz

operation

overvoltage, transformer saturation and

overheating

Description

The STEVAL-ISA121V1 demonstration board

implements a 15 W single-output wide range

mains power supply to be used as an auxiliary

adapter in applications such as LCD, plasma or

LED TVs, desktop computers, etc., when the

main power supply is OFF or in standby mode

and the auxiliary power supply must provide

energy only to some specific parts of the

equipment such as USB ports, remote receiver,

etc.

The board uses the new VIPER37LE, an offline

high voltage converter from the VIPerPlus family,

specifically designed for fixed frequency flyback

converters, which combines a high-performance

low voltage PWM controller chip and a max. 4.5

Ω

MOSFET in the same package.

The application is optimized for less than 30 mW

standby consumption and meets EPA 2.0 limits,

thereby helping to meet the most stringent

energy-saving requirements.

The board implements several protection features

that considerably increase end-product safety

and reliability: overload protection, overvoltage

protection, brownout protection, hysteretic

thermal protection, shorted secondary rectifier

detection, and transformer saturation protection,

all of which are in auto-restart mode.

STEVAL-ISA121V1

www.st.com