DER-191: 5V & 15V @ 2A, 40W, 90~265 VAC in


This engineering report describes an LCD Monitor power supply utilizing the TOPSwitch®-HX TOP256 from Power Integrations Inc.

This report contains the power supply specifications, schematic, bill of materials, transformer documentation, printed circuit board layout, and performance data for this evaluation platform.

This flyback converter configuration, built around the TOP256 (U1), provides two output voltages; a 5 V output and a 15 V output. Each delivers a load current of 2.0 A. This power supply operates using inputs between 90 VAC and 264 VAC. The main output, 5 V, is regulated using voltage reference U3. A small portion of the feedback signal is also derived from the 15 V output.


Manufacturer Power Integrations
Category AC/DC and DC/DC Conversion
Sub-Category AC/DC SMPS - Multi Output
Eval Board -
AC Voltage 115 V
230 V
Universal (115 / 230V)
Outputs and Type 2 Isolated
Voltage Out: Highest Current First 5V, 15V
Ouput Current 2A per Channel
Output Power 40 W
Efficiency @ Conditions >82%, 115 ~ 265 VACin
No-load Input Power @ Voltage 200 mW @ 230 V
Features Current Limit (Adj. or Fixed)
Open Circuit Protection
Over Voltage Protection
Short Circuit Protection
Thermal Protection
Under Voltage Protection, Brown-Out
Switching Frequency 119 ~ 145 kHz
Internal Switch Yes
Component Count + Extras 54 + 9
Voltage In 90 ~ 265 VAC
Application / Target Market LCD TV / Monitor
Design Author Power Integrations
Main I.C. Base Part TOP256

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