STEVAL-ISA001V1: 6W, 5V and 12V, 85 ~ 265VAC

Summary

The circuit operates from 85Vac to 264Vac input voltage with an output power peak of 6W through two output voltages of 5Vdc and 12Vdc. It contains an input fuse (F2), EMI filtering (C1, L1, and C2), and the secondary regulation is provided by U2 and U3, the optocoupler and TL431 respectively.

An additional LC (PI) filter is added to the 5Vdc output, C9-L2 configuration, for further effective ripple and noise rejection. The AC input is rectified and filtered by the bridge BR1 and the bulk capacitor C1 to generate the high voltage DC bus applied to the primary winding of the transformer, T1.

The 5Vdc output is sensed with an optocoupler. It is possible to modify the output voltages by changing the transformer turns ratio and modifying the resistance values of R7 and R8 in the feedback loop. R2 and C4 form the snubber circuit needed to reduce the voltage ringing on the drain pin and the leakage spikes.

Specifications

Manufacturer	STMicroelectronics
Category	AC/DC and DC/DC Conversion
Sub-Category	AC/DC SMPS - Multi Output
Eval Board Part Number	497-4931-ND
Eval Board Supplier	STMicroelectronics
Eval Board	Board not Stocked
AC Voltage	115 V 230 V Universal (115 / 230V)
Outputs and Type	2 Isolated
Voltage Out: Highest Current First	12V, 5V
Current Out	600mA, 250mA
Output Power	6 W
Efficiency @ Conditions	>79%, 220V in, Full Load >76%, 120V in, Full Load
No-load Input Power @ Voltage	153 mW @ 115 V 222 mW @ 230 V
Features	Energy Standard Compliant Light Load Mode Over Current Protection Over Voltage Protection Short Circuit Protection Thermal Protection Under Voltage Protection, Brown-Out Zero Load Regulation
Switching Frequency	60 kHz
Internal Switch	Yes
Component Count + Extras	30 + 4
Voltage In	85 ~ 265 VAC
Application / Target Market	Power: AC Adapters Set-Top Boxes Telecom White Goods
Design Author	STMicroelectronics
Main I.C. Base Part	VIPer12A
Date Created By Author
Date Added To Library	2011-03