General circuit description

STEVAL-ISA013V1

2/5

1

General circuit description

The evaluation board operates from 90 to 264Vac input with an output power peak of 24W

through two output voltages of +5V and +12V.

The AC input is rectified and filtered by the bridge BR1 and the bulk capacitor C2 to generate

the high voltage DC bus applied to the primary winding of the transformer, T1.

The switching frequency is set at 100kHz through R3 and C5.

Secondary regulation is provided by an optocoupler and a programmable voltage reference

(TL431).

The transformer is designed and manufactured by Cramer Coil and Transformer Company, Inc.

This evaluation board has an efficiency of 78% at 115Vac at full load for both outputs.

The evaluation board consumes less than 1W total power consumption when working in burst

mode during standby operation and therefore, meets Blue Angel norm.

Obsolete

Product(s)

- Obsolete

Product(s)