ST ISA035V1 User Manual

STEVAL-ISA035V1

Non-isolated offline power supply demonstration board based on the VIPER22A-E

Data brief

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

STEVAL-ISA035V1

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.

January 2010	Doc ID 15041 Rev 2	1/4
For further information contact your local STMicroelectronics sales office.		www.st.com

Schematic diagrams	STEVAL-ISA035V1

1 Schematic diagrams

Figure 1. Circuit schematic for 12 V at 350 mA

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Figure 2. Circuit schematic for 16 V at 350 mA

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2/4	Doc ID 15041 Rev 2