October 2016

DocID029796 Rev 1

1/4

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STEVAL-ISA182V1

8.4 W / 30 W peak power offline flyback converter using

VIPER38HD

Data brief

Features



US input range: 85

– 60 Hz



Output voltage / current: 12 V / 0.7 A (2.5 A

peak)



Very compact size



Standby mains consumption: lower than 25



Min. active mode efficiency: 81.14%



Min. active mode at 10% load efficiency:

71.14%



EMI: according to EN55022-Class-B



RoHS compliant

Description

The STEVAL-ISA182V1 evaluation board

implements an isolated flyback converter (12 V /

0.7 A) 8.4 W (30 W peak), US range 85

– 132

The core of the application is the VIPER38HD,

the latest offline converter from the VIPerPlus

family. The device is a high-voltage converter

that intelligently integrates an 800 V rugged

power MOSFET with PWM current-mode control.

The device features an adjustable extra power

timer (EPT) that enables the IC to sustain

overload conditions for a few seconds.

The main characteristics of the evaluation board

are its small size, minimal BoM, high efficiency

and low standby consumption. Extremely low

consumption under the no-load condition is

ensured thanks to burst mode operation that

reduces the average switching frequency and

minimizes all frequency related losses.

VIPER38HD operates at 115 kHz fixed

frequency. Frequency jittering is implemented to

help meet the standards regarding

electromagnetic disturbance. The IC features

high-level protections like dual-level OCP, output

overvoltage, short-circuits and thermal shutdown

with hysteresis. After the removal of a fault

condition, the IC is automatically restarted.