april 2011 doc id 018592 rev 1 1/5 5 EVALPM8803-FLY EVALPM8803-FLY: ieee802.3at compliant demonstration kit with synchronous flyback 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-FLY is a demonstration board implementing an i eee802.3at compatible interface together with a synchronous rectification flyback 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 for the main component (mos, transformer, etc). it is possible to connect auxiliary sources to one of the 2 jacks in the EVALPM8803-FLY like in real application design. in one case thanks to the pm8803 feature, preval ence 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-FLY www.st.com
schematic diagrams EVALPM8803-FLY 2/5 doc id 018592 rev 1 1 schematic diagrams figure 1. demonstration kit schematic: detail of the poe+ input section including data transformer, diode bridges, protection and optional cm choke ! - v 3 3 6 3 3 6 3 3 6 3 3 6 3 3 6 3 3 6 3 3 6 3 3 6 3 3 6 3 3 6 3 3 6 3 3 6 3 3 6 3 3 6 3 3 6 3 3 6 3 3 6 3 3 6 3 3 6 3 3 6 3 3 6 & % / 0 & % / 0 & % / 0 0 / % & 6 3 3 6 / 5 4 3 0 # h a s s i s # h a s s i s # h a s s i s # h a s s i s # h a s s i s # h a s s i s 2 4 . 2 4 . ! 5 8 ! u x i l i a r y i n p u t f r o n t a l o r ! 5 8 / p t i o n 3 t a n d a r d $ i o d e " r i d g e . o t - o u n t e d / p t i o n 3 t a n d a r d $ i o d e " r i d g e . o t - o u n t e d / p t i o n ! c t i v e " r i d g e . o t - o u n t e d / p t i o n ! c t i v e " r i d g e . o t - o u n t e d / p t i o n ) n p u t # o m m o n - o d e & |