STMicroelectronics IEEE802.3at compliant demonstration kit with synchronous forward PoE converter EVALPM8803-FWD EVALPM8803-FWD Data Sheet

June 2011

Doc ID 018599 Rev 2

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EVALPM8803-FWD: IEEE802.3at compliant demonstration kit

with synchronous active clamp forward PoE converter

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EEE 802.3at compliant

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Support for Gigabit Ethernet

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Data pass-through for the ethernet data

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Works with power supplied from Ethernet LAN 
cables or from local auxiliary sources

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Successful IEEE802.3at Layer1 classification 
indicator

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Single output 3.3 V/5 V

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90+% converter efficiency 

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Board size 10x13 cm

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.