Data brief
For further information contact your local STMicroelectronics sales office.
January 2010 Doc ID 15041 Rev 2 1/4
4
STEVAL-ISA035V1
Non-isolated offline power supply demonstration board
based on the VIPER22A-E
Features
■ Input voltage range: 85 Vac to 264 Vac
■ Input voltage frequency: 50/60 Hz
■ Lowest possible component count
■ Integrated thermal overload protection
■ No-load consumption: around 200 mW
■ 70% to 80% efficiency at full load
■ Integrated short-circuit protection
Description
Many appliances today use non-isolated power
supplies to furnish the low output power required
to run a microcontroller, LED displays, and relays
or AC switches. This type of power supply has a
single rectifier to reference the neutral to output
ground in order to fire Triacs or AC switches.
This demonstration board can use the
VIPER12A-E or the VIPER22A-E, which are pin-
for-pin compatible and can supply power for a
wide variety of applications.
The VIPER12A-E is used for 12 V at 200 mA and
16 V at 200 mA, while the VIPER22A-E is used
for 12 V at 350 mA and 16 V at 350 mA.
The same board can be used for any output
voltage from 10 V to 35 V.
For more design details, please refer to
application note AN1357.
STEVAL-ISA035V1
www.st.com
