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 EVALPM8803-FLY Description The EVALPM8803-FLY is a demonstration board implementing an IEEE802.3at 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, 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. April 2011 Doc ID 018592 Rev 1 1/5 www.st.com 5 !58 #HASSIS 40 40 2 2 2 2 + 2 !UXILIARYINPUTFRONTALOR!58 30 * $!4! 0/7%2).054 * . # $ # N& +6 2 .- 30 3-! $ 3403(! $ 3-! 3403(! /PTION3TANDARD $IODE"RIDGE .OT-OUNTED 3-! 3-! 3403(! $ 3-! $ 3-! 3403(! /PTION!CTIVE"RIDGE .OT-OUNTED N& 6 # 2 2 $ #HASSIS # N& 6 # N& 6 # N& 6 2 2 2 2 2 2 3403(! $ .- 2 .- 3403(! 3-# 344(3 2 . 2 2 . 4 3-! 3403(! $ 3-! $ %4(,$ 4 %4(,$ 3403(! /PTION3TANDARD $IODE"RIDGE .OT-OUNTED # N& 6 2 2 # .+6 # N& 6 #HASSIS # N& 6 40 /PTION!CTIVE"RIDGE .OT-OUNTED # N& 6 2 2 2 2 2 2 # U& 6 2 2 # N& 6 40 3-! .- $ 40 .- .- # . 6 24. # . 6 #HASSIS #HASSIS # . 6 2 &ERRITE"EADOHM! 4.- &ERRITE"EADOHM! 2 7URTH3 633 0/ %& /PTION )NPUT#OMMON-ODE&ILTER .OT-OUNTED 6/54 /PTION $IFFERENTPOSITIONFOR463AND #-CHOKE"YPASSCAPACITORS .OT-OUNTED 2 2 # N& 6 40 Doc ID 018592 Rev 1 2/5 #HASSIS # U& 6 * $ 3-! # N& 6 24. 3-!*! # N& 6 633 0/%& $!4! /54054 Schematic diagrams EVALPM8803-FLY 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 633 30 # N& 0/%& 2 + 2 + 3! # .- 2 2 40 2 2 6$$ 6$$ $%4 30 #,3 $##, 3! $4 &23 40 5 2 K 2 + (433/0 0- 2 . # . 0-CIRCUIT 2 4"$ 2 K 2 $ .3-! # 633 24. !24. '!4 6# '!4 24. #3 6" #4, 2 + ./4%FOR*UMPERS*-AND*- -OVETHESHORTONBOTHJUMPERSATTHESAMETIME SHORTBETWEENPINANDWHENUSED!58INPUT SHORTBETWEENPINANDWHENUSED!58INPUT ./4%FOR#APACITORS 7HERENOTINDICATEDTHEBODYISANDTHEVOLTAGEIS6 $ 2 + 40 # U& 6 + .- # 5 # P& 2 .- &AIRCHILD&/$!3 !24. # U& 6 # U& 6 X /PTION $ISCRETE,INEAR 2EGULATORON6# .OT-OUNTED # U& 6 2 2 2 !24. 2 + *- *UMPERDOPPIO N& # 40 3-# 344(3 .- 6 2 + ./4%FOR2ESISTORS 7HERENOTINDICATEDTHEBODYISANDTOLERANCE .- # 2 + *- *UMPERDOPPIO 2 2 40 2 + 2 40 %X0AD , U( $ !58 2 2 40 # U& 6 !58 K 40 2 + 3/$ !5802%3%.4 6/54 2 + "!4* $ 2 2 2 2 3/$ "!4* 2 U& 6 U& 6 $ # # 24. 40 0OWERCIRCUIT 2 24. )NPUT&ILTER -33-, 3-! 40 2 3/ 4 # .+6 24. 2 2 2 + 2 2 /PTION !CTIVE#LAMP#IRCUIT .OT#ONNECTED 4 #/),#2!&4$!!, N& # N& $ "!4* 3/$ "!4* 3/$ $ # 2 .- 3/$ # .- 24. 5 U 6 # U 6 # # N& +6 3/$ # U& 6 "!4* $ &AIRCHILD&/$!3 U 6 # 5 &AIRCHILD&/$!3 !24. # N& 2 + 2 $ .- 40 1 --"4,4 3/4 2 2 3/0720!+3/ 343.,,( 1 2 /PTION $IODE2ECTIFICATION WITH$0AKBODY .OT-OUNTED /PTION !LTERNATIVESYNCHMOSFET DRIVINGCIRCUIT .OT#ONNECTED 40 40 ./4% 4HE!24.ISADEDICATEDPLANEOFSIGNALGROUNDTHATWILLBECONNECTEDTOTHE 24.POWERGROUNDPLANECLOSETOPINANDOF0- N& # #OILCRAFT(!!, 3I$9 1 2 2 OHM 24. 24. 2 OHM 40 !24. 40 3403(! $ # N& * /PTION ALTERNATIVEPOWERTRANSFORMERS FORESEENONTHEPCB 0/%0SERIESIN%0 0/%&SERIESIN%&$ .OT-OUNTED 6!58 Doc ID 018592 Rev 1 , U( N& # .- 2 + $ ,/+ 40 ,OK ,/+ $ 2 + 2 + 2 + 2 2 2 P& U 6 # 6OUT # U& 6 # U& 6 X 2 # U 6 # &EEDBACKCIRCUIT 3/4 5 3/$ "!4* $ 2 2 43!),4 2 + # N& /UTPUT&ILTER U 6 # $/-, '2%%.,%$ 2 K 2 K 40 # N& 40 * Figure 2. EVALPM8803-FLY Schematic diagrams Demonstration kit schematic: detail of the PoE+ section based on flyback topology with synchronous rectification !-V 3/5 Revision history 2 EVALPM8803-FLY Revision history Table 1. 4/5 Document revision history Date Revision 11-Apr-2011 1 Changes Initial release. Doc ID 018592 Rev 1 EVALPM8803-FLY 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. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. 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