Description
The STEVAL-ISA110V1 demonstration board is a
12 V-1 A power supply set in non-isolated flyback
topology using the VIPER26LN, a new offline
high-voltage converter by STMicroelectronics.
The features of the device include an 800 V
avalanche-rugged power section, PWM operation
at 60 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 low standby power.
Protection features 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 @ 1 A continuous
operation
■ Standby mains consumption: < 30 mW @ 265
VAC
■ Average efficiency: > 85%
■ Fully protected against faults (overload,
feedback disconnection and overheating)
■ EMI: according to EN55022-Class-B