Design contains obsolete parts

DER-097: 48V @ 450mA, 85 ~ 265VAC in


This document is an engineering report describing a Power over Ethernet (PoE) power supply utilizing TOP246P. The power supply delivers 21.7 W continuous from an input of 85 to 265 VAC.

This document provides complete design information including specification, schematic, bill of material and transformer design and construction information. The document also provides performance information.

Although this board is designed to satisfy safety isolation requirements, the engineering prototype has not been agency approved. Therefore, all testing should be performed using an isolated source to provide power to the prototype board.


Manufacturer Power Integrations
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 48 V
Current Out 450 mA
Output Power 21.7 W
Features Current Limit (Adj. or Fixed)
Frequency Jitter for EMI
Over Voltage Protection
Short Circuit Protection
Soft Start
Thermal Protection
Under Voltage Protection, Brown-Out
Efficiency @ Conditions >75%, 85 VAC, 48V @ 4.9 ~ 21.7 W
>75%, 265 VAC, 48V @ 9.8 ~ 21.7 W
>75%, 230 VAC, 48V @ 7.8 ~ 21.7 W
>75%, 115 VAC, 48V @ 7.1 ~ 21.7 W
No-load Input Power @ Voltage - Not Given
Switching Frequency 132 kHz
Internal Switch Yes
Component Count + Extras 43 + 4
Voltage In 85 ~ 265 VAC
Design Author Power Integrations
Application / Target Market PoE, Power Over Ethernet
Power: AC Adapters
Main I.C. Base Part TOP246
Date Created By Author 2005-09
Date Added To Library 2014-07