Datasheet

June 2011 Doc ID 018599 Rev 2 1/5

EVALPM8803-FWD

EVALPM8803-FWD: IEEE802.3at compliant demonstration kit

with synchronous active clamp forward PoE converter

Features

■ EEE 802.3at compliant

■ Support for Gigabit Ethernet

■ Data pass-through for the ethernet data

■ Works with power supplied from Ethernet LAN

cables or from local auxiliary sources

■ Successful IEEE802.3at Layer1 classification

indicator

■ Single output 3.3 V/5 V

■ 90+% converter efficiency

■ Board size 10x13 cm

Description

The EVALPM8803-FWD is a demonstration board

implementing an IEEE802.3at compatible

interface together with a self driven synchronous

active clamp forward converter based on

PM8803.

The board is designed to work up to 30 W, and

with minimal changes the output voltage can be

selected either 5 V or 3.3 V. For sake of flexibility,

alternative footprint have been foreseen tor the

main component (MOS, transformer, etc.).

It is possible to connect auxiliary sources to one

of the 2 jacks in the EVALPM8803-FWD like in

real application design. In one case thanks to the

PM8803 feature, prevalence of the auxiliary

source can be guaranteed.

Three LEDs give indication of:

– the converter is running

– an external auxiliary source is connected to

the board

– a type 2 PSE is connected to the board.

EVALPM8803-FWD

www.st.com

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EVALPM8803-FWD EVALPM8803-FWD: IEEE802.3at compliant demonstration kit with synchronous active clamp forward PoE converter Features ■ EEE 802.3at compliant ■ Support for Gigabit Ethernet ■ Data pass-through for the ethernet data ■ Works with power supplied from Ethernet LAN cables or from local auxiliary sources ■ Successful IEEE802.3at Layer1 classification indicator ■ Single output 3.
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Revision history 2 EVALPM8803-FWD Revision history Table 1. 4/5 Document revision history Date Revision Changes 07-Apr-2011 1 Initial release.
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EVALPM8803-FWD Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.