STEVAL-ISA002V1: 6W, 12V @ 500 mA, 85 ~ 265VAC

Summary

This board is designed as a discontinuous flyback regulator delivering 0.5A at 12V. The AC input is rectified and filtered by the bridge BR1, the bulk capacitor C1, and C2 to generate the high voltage DC bus applied to the primary winding (pins 8-10) of the transformer, TR1.

C1, L1, and C2 provide EMI filtering for the circuit. R2 and C3 form the snubber circuit needed to reduce the leakage spike and voltage ringing on the drain pin of VIPer12A. The output voltage is regulated with a TL431 (U3) via an optocoupler (U2) to the feedback pin.

The output voltage ripple is controlled with the capacitor, C7, with an additional LC PI filter configuration made up of L4 and C8. It is possible to modify the output voltages by changing the transformer turns ratio and modifying the resistance values of R6 and R7 in the feedback loop.

* Based on board 497-4930-ND STEVAL-ISA002V1

Specifications

Manufacturer STMicroelectronics
Category AC/DC and DC/DC Conversion
Sub-Category AC/DC SMPS - Single Output
Eval Board Board not Stocked
AC Voltage 115 V
230 V
Universal (115 / 230V)
Outputs and Type 1 Isolated
Voltage Out 12 V
Current Out 500 mA
Output Power 6 W
Features Light Load Mode
Over Current Protection
Over Voltage Protection
Short Circuit Protection
Thermal Protection
Under Voltage Protection, Brown-Out
Zero Load Regulation
Efficiency @ Conditions >74% @ Full Load
No-load Input Power @ Voltage 168 mW @ 115 V
248 mW @ 230 V
Switching Frequency 60 kHz
Internal Switch Yes
Component Count + Extras 28 + 3
Voltage In 85 ~ 265 VAC
Design Author STMicroelectronics
Application / Target Market Power: AC Adapters
Set-Top Boxes
Telecom
White Goods
Main I.C. Base Part VIPer12A
Date Created By Author
Date Added To Library 2011-03

Support Documents & Media

STEVAL-ISA002V1 - Data Brief VIPer12A-E - Datasheet STEVAL-ISA002V1 - BOM

Media

STEVAL_ISA002V1_Schematic.JPG STEVAL_ISA002V1_Board.JPG