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Description

The STEVAL-ISA111V1 demonstration board is a

12 V, 1 A power supply set in non-isolated flyback

topology using the VIPER26HN, the new offline

high voltage converter by STMicroelectronics.

The features include an 800 V avalanche rugged

power section, PWM operation at 115 kHz with

frequency jittering for lower EMI, current limiting

with adjustable set point, onboard soft-start, a

safe auto-restart after a fault condition and a low

standby power. The protections include thermal

shutdown with hysteresis, delayed overload

protection, and open loop failure protection.

Features

■ Universal input mains range:

– input voltage 90 - 264 VAC

– frequency 45 - 65 Hz

■ Single-output voltage: 12 V at 1 A continuous

operation

■ Standby mains consumption: < 30 mW at

230 VAC

■ Average efficiency: > 80

■ Fully protected against faults (overload,

feedback disconnection and overheating)

■ EMI: according to EN55022-Class-B

■ RoHS compliant