STEVAL-TSP004V2 PoE 5 V - 4 A PD converter based on the PM8803 IEEE802.3at compliant synchronous flyback controller Data brief Description The STEVAL-TSP004V2 is a reference design for a PoE+, high-efficiency, 5 V - 4 A flyback converter based on the PM8803 PoE controller. The PM8803 is a highly integrated device embedding an IEEE802.3at-compliant powered device (PD) interface together with a PWM controller and support for auxiliary sources. The STEVAL-TSP004V2 reference design is based on an isolated flyback topology CCM converter featuring synchronous rectification with gate driver transformer. Features IEEE 802.3at compliant PD interface Works with power supplied from Ethernet LAN cables or from local auxiliary sources Line Input voltage range: 40 VDC to 60 VDC Output voltage: 5 VDC 5% Output current: 4 A Peak-to-peak output ripple: < 30 mV Efficiency DC-DC full-load: > 92% Overall peak efficiency: > 89% Transient response VOUTPK-PK to 50% load step: < 170 mV V in load line case: < 0.5% RoHs compliant April 2015 DocID027712 Rev 1 For further information contact your local STMicroelectronics sales office 1/7 www.st.com Chassis 1 2 3 4 5 6 7 8 GSPG17042015DI1215 DocID027712 Rev 1 1 2 3 0R0 1206 R26 0R0 1206 TP3 BLACK R37 R32 15K 0805 TP2 Red Auxiliary input frontal orAUXI SP AUX 1 J2 DATA & POWER INPUT J3 10 9 2/7 STTH302S SMC D1 SP D14 STPS2H100A SMA D7 STPS2H100A SMA C5 10nF 10% 0603 100V R10 75R 0603 R12 75R 0603 D17 STPS2H100A SMA D4 STPS2H100A SMA Chassis C12 2.2nF 2KV 1812 C6 C7 10nF 10% 10nF 10% 0603 0603 100V 100V R11 75R 0603 C8 10nF 10% 0603 100V R13 75R 0603 D12 STPS2H100A SMA D8 STPS2H100A SMA D13 STPS2H100A SMA D9 STPS2H100A SMA 2 1 3 4 5 6 8 7 9 10 11 12 ETH1-460 T1 24 23 22 21 20 19 18 17 16 15 14 13 75R 75R 0603 R7 75R 0603 R5 75R 0603 R2 0603 R1 Chassis TP23 BLACK C16 1nF 10% 0805 100V TP22 Red TP24 BLACK R1250R0 C9 2.2nF 2KV 1812 1206 R17 0R0 1206 R43 0R01206 VSS POE+F Chassis J4 VSS C21 1nF 10% 0603 100V RTN C14 1nF 10% 0603 100V POE+F DATA OUTPUT C18 D11 0.1uF 10% SMAJ58A 0805 SMA 100V Chassis 1 2 3 4 5 6 7 8 10 1 9 Chassis Schematic diagrams STEVAL-TSP004V2 Schematic diagrams Figure 1: STEVAL-TSP004V2 circuit schematic (1 of 2) VSS SP POE+F 27k C19 10nF R27 R38 1k C69 10nF R101 24.9K 1% 1% R64 0R0 SA J1 1 2 3 MMBT3904LT1 SOT23 Q18 R49 1206 0R0 R0805 R72 120K 1% 1% R54 1206 0R0 C23 470nF 10% 50V 0603 R9 1K 1% R0603 24.9K 1 % 1% R95 30R9 1% R131 T2P R51 15K 0805 TP8 BLACK TP7 Red TP11 BLACK 11 12 13 14 15 16 17 18 19 20 R70 10K 1% 1% HTSSOP20-LARGE PM8803 VDD VDD DET SP CLS DCCL SA DT FRS T2P SA Ex Pa d 21 D21 U1 0805 100V C60 1nF VSS RTN ARTN GAT2 VC GAT1 RTN CS VB CTL R65 1K R58 27K SMC 10 9 8 7 6 5 4 3 2 1 10nF C38 STTH302S TP14 Red TP4 Red C41 1uF 25V 0603 ARTN C53 1uF ARTN SOD323 BAT46J D52 2.2u 1210 100V C64 L5 10uH 2 VC C54 470p R89 3.3K C40 1uF 25V 0805 510R R103 R66 10R Inpu t Filter C26 33uF 20% 100V 10x10.2 MSS7341-103ML 1 ARTN SOD323 BAT46J D57 R0805 R92 10R RTN RTN D28 10R R62 SOD323 TP15 Red 1206 RTN RTN Q17 SO8 VSS SP 3 3 Si4848DY 0.1uF C45 R108 R109 0.30 ohm 1% 0.30 ohm 1% 1206 1206 TP18 Red 4 Red TP16 R23 100R 1206 TP19 BLACK R21 220R C30 68pF 0805 100V R107 10K 0R0 R84 BAT46J Powercircuit D32 MM3Z15VT1 SOD323 C39 1uF 25V 0603 2.2u 1210 100V 2.2u 1210 100V RTN C29 C28 TP9 Red 5 6 7 8 1 2 3 48V AUX2 TBD 2KV 1812 T5 9 10 7 6 T8 JM1 Jumper-doppio 6 4 JM2 Jumper-doppio 1 1 3 1 SA RTN COILCRAFT DA2319-AL COILCRAFT HA3691-AL 5 4 2 1 C22 2 DocID027712 Rev 1 2 R45 R83 10K C44 24.9K 0.1uF U2 D36 BAT46J SOD323 BAT46J SOD323 D34 8 7 6 5 0805 C31 1.5nF 2 1 3 4 Fairchild FOD817AS R80 20R TP10 Red TP5 Red Q12 R44 3K3 ARTN RTN C50 47nF R90 1k5 C27 22uF 1206 16V U3 22uF 1206 16V C67 22uF 1206 16V C68 C61 2 3 T2P VC 1812 2.2n 2KV SOD323 L6 0.33uH 2 R117 C59 1uF 25V 0603 5.1K 2 3 4 1 C56 47nF 22uF 1206 16V C35 2 1 3 4 Fairchild FOD817AS U7 Feedback circuit SOT23-5 TS431AILT5 U4 SOD323 R93 1K 22uF 1206 16V C33 BAT46J D40 R99 47K C49 3.3nF Ou tpu t Fil ter DO1813-331ML 1 BAT46J D39 1 4 Fairchild FOD817AS 22uF 1206 16V C37 Auxiliary present TP21 Red D20 Aux det Q16 MMBT3906LT1 SOT23 TP13 Red PowerFLATTM 5x6 STL60N3LLH5 3 2 1 0805 R53 5R R119 3.3K TP20 Red D44 T2P det R112 15K 1% 1% R111 12.4K 1% 1% R94 21K 1% 1% C36 0.1u 2 1 J5 BLACK TP12 2 1 TP6 Red T2P present 0R0 R122 D26 4.7K 1% 1% R104 C55 100pF R96 0R0 Out de t C48 1uF 25V 0603 R91 10R C34 330uF 16V 8x10.2 R52 3K3 STEVAL-TSP004V2 Schematic diagrams Figure 2: STEVAL-TSP004V2 circuit schematic (2 of 2) GSPG02042015DI1005 3/7 4 Detailed description 2 STEVAL-TSP004V2 Detailed description The PM8803 evaluation board, STEVAL-TSP004V2, has been designed to cover a broad range of Power over Ethernet (PoE) applications. The PM8803 is a highly integrated device embedding an IEEE802.3af/at-compliant powered device (PD) interface together with a PWM controller and support for auxiliary sources. Although the PM8803 can be configured to work in several isolated topologies (self-driven or transformer gate-driven), the focus here is on a high-efficiency isolated flyback converter topology with synchronous rectification, 5 V output voltage with 4 A output current capability. Auxiliary sources can be connected to the board on 2 different input connectors. One input (AUX II) allows prevalence of the auxiliary sources with respect to the PoE, while the other input (AUX I) allows the use of a wall adapter with voltage lower than the internal PoE UVLO threshold, while still benefitting from the inherent inrush and DC current limit. The possible configurations supported by the PM8803 evaluation board as options on the same PCB are: 4/7 Input diode bridges; 4 possible options, including active bridges Optional 4-pair detection circuit, to detect a high power PSE source Optional booster circuit, to increase the max input current over 800 mA Diode or synchronous rectification; 4 package options for diode and 3 package options for MOSFET Primary side snubber; 3 options including active clamp Power transformer; 3 size options for transformer gate-driven solutions and 2 size options for self-driven applications DocID027712 Rev 1 STEVAL-TSP004V2 3 Efficiency Efficiency Figure 3: Efficiency DocID027712 Rev 1 5/7 Revision history 4 STEVAL-TSP004V2 Revision history Table 1: Document revision history 6/7 Date Version 24-Apr-2015 1 DocID027712 Rev 1 Changes Initial release. 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