STEVAL-POE002V1 Data brief Power over Ethernet - PD converter with 5 V 8 A output, synchronous Flyback, IEEE802.3bt standard compliant Features * * * * Based on PM8804 and PM8805 IEEE 802.3bt compliant PD interface Works with power supplied from Ethernet LAN cables or local auxiliary sources Line input voltage range: 40 to 60 VDC * Output voltage: 5 VDC 2.5% * * * * * * Output current: 8 A Peak-to-peak output ripple: < 50 mV DC-DC full load efficiency: > 91% Overall full load efficiency: > 90% Transient response V pk-pk 100% to 50% load step 700mV Switching frequency 280 KHz Description The STEVAL-POE002V1 power device evaluation board is equipped with a DC-DC converter stage, managed by the PM8804 controller, which provides 40 W (5 V-8 A) on the output. The DC-DC converter stage is based on the fixed frequency Flyback topology with a secondary synchronous rectification managed by the controller via gate driver transformer. Product summary Power over Ethernet-PD converter based on PM8804 and PM8805 STEVALPOE002V1 PWM peak current mode controller for PoE and telecom systems PM8804 IEEE802.3bt PoE-PD interface with integrated dual-active bridge PM8805 The evaluation board embeds also the PM8805 controller, dedicated to the Ethernet interface (compliant with the Standard IEEE802.3.af/at/bt) and to the full active bridge rectification. DB3628 - Rev 1 - October 2018 For further information contact your local STMicroelectronics sales office. www.st.com STEVAL-POE002V1 STEVAL-POE002V1 schematic diagrams 1 STEVAL-POE002V1 schematic diagrams Figure 1. STEVAL-POE002V1 circuit schematic (1 of 4) Chassis Chassis 10 10 T1 12 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 11 14 Orange 15 R175R 10 J2 9 0603 9 J1 13 16 Data and power input Chassis 9 Green Chassis 17 Data output R275R 8 7 18 0603 6 19 5 Blue 20 21 R375R 4 0603 22 3 Brown 23 R475R 2 1 24 0603 R5 75R 0603 U16 SMC SM15T68CA C6 NM C7 NM 1812 1KV 1812 1KV SM15T68CA U17 U18 SMC SMC SM15T68CA C8 NM C9 NM 1812 1KV 1812 1KV R6 75R 0603 R7 75R 0603 C2 10nF 0603 100V C1 10nF 0603 100V U19 SMC SM15T68CA R8 75R 0603 ETH1-460 C4 10nF 0603 100V C3 10nF 0603 100V C5 2.2nF 2KV 1812 C10 2.2nF 2KV 1812 R90R 2010 B88069X9231T203-NM R57 1 NM0805 C62 1nF T5 744272102 0805 100V 2 NM IN78 Brown U11 SMC NM 2 U8 SMC NM Orange IN12 Chassis U21 SMC NM 3 L8 R60 1 0805 NM Green 2 Ferrite bead 0805 U6 SMC NM U7 SMC NM Chassis RAUX R20 3.9K T0 12 EP4 CLS1 T1 R23 36R5 1% 0805 R22 150R 1% 0805 VOB R14 26.1K 1% 35 34 39 38 37 36 IN45 IN45 GND45 GND45 41 40 IN78 IN78 GND78 GND78 QFN56-8X8X1-49PIN 13 14 T2 IN12 ExPad VOUT VOUT NC PGD CTRL GND36 GND36 Note for capacitors: where not indicated the body is 0603, the voltage is 100 V material X7R and tolerance 10% 100 nF 100 V is X7R 10% 0805. R19 3.9K PM8805 IN36 IN36 R18 3.9K VCP DET VDD VOB ExPad ExPad U1 19 20 FAUX VB STBY CLS1 CLS2 AGND T0 T1 T2 FAUX RAUX ExPad IN45 IN36 ExPad EP2 33 32 31 30 29 EP6 EP5 BAV70 D3 C14 10nF 100V C65 NM 0805 100V R107 PGD 0R0 28 27 26 25 24 VDC R21 NM 0805 C15 33uF-NM 23 EP3 21 22 T0 GND12 GND12 D6 T1 VOB VOB Note for resistors: where not indicated the body is 0603 and tolerance 5% D5 T2 IN12 IN12 STBY D4 17 18 2 3 4 5 6 7 8 9 10 11 VB VB ExPad IN78 15 16 EP1 1 VOB VOB 43 42 VOB 100V 0805 100nF C13 Note for T0 T1 T2 signals: they might not be used 3 2 2 2 Ferrite bead 0805 Ferrite bead 0805 C64 T6 1nF 744272102 0805 100V T8 NM 3 L7 1 0805 4 4 1 1 NM0805 U5 SMC NM C12 1 nF 0603 100V Note for Class1 and Class2 resistors: their final value could be selected from the table based on the output power and Type of the PD. L6 R58 1 Blue IN45 U20 SMC NM 3 3 2 T7 NM R59 2 Ferrite bead 0805 4 1 4 U10 SMC NM C11 1 nF 0603 100V L5 2 B88069X9231T203-NM Chassis 1 Note for surge arrester: foreseen on PCB footprint for B88069X9231T203 RV2 1 RV1 C19 100nF 0805 100V D7 SMA NM C18 U9 470 pF SMC 0603 SM15T68CA100V R10 1k 0805 100V 10x10.2 C16 4.7uF 1210 100V C17 100nF 0805 100V VB GND Figure 2. STEVAL-POE002V1 circuit schematic (2 of 4) CLS1 AUXF SMC J9 STTH302S 1 2 3 AUX Rear VDC 1 2 3 4 P2 R75 1k R0805 R123 1k D43 SOD323 D45 SOD323 R115 100k D47 SOD323 BAT46J D37 SOD323 D44 VB RAUX FAUX STBY STBY High D39 P1 R67 0R-NM 0805 R77 0R-NM SHDN BAT46J R119 100k 2 4 BAT46J 1 2 3 R76 0R 1 3 BAT46J STTH302S R118 0R-NM SLEEP/WKUP BAT46J SMC J10 Raux +live PoE R69 100k 0805 AUXR D20 D40 SOD323 AutoClass C86 NM 0805 D14 SOD323 BAT46J VB BAT46J AUX Front VOB D42 R122 47K 0805 R116 D46 SOD323 100k D41 R121 47K 0805 C85 NM 0805 R120 3k9 C84 10nF R117 3k9 C83 10nF R114 3k9 C82 10nF GND RAUX FAUX STBY DB3628 - Rev 1 RAUX FAUX STBY page 2/5 STEVAL-POE002V1 STEVAL-POE002V1 schematic diagrams Figure 3. STEVAL-POE002V1 circuit schematic (3 of 4) L20R R24 VDC 2 0R NM L30R R26 C29 33F 100V 10x10.2 EEEFK2A330P C20NM C30 NM 0805 SGND C25 100pF 0805 C31 C32 C33 4.7F 1210 100V 4.7F 1210 100V 4.7F 1210 100V R25 100R 1206 2 VINnf 1 GND L1 XAL5050-562 2 2KV 1812 C24 4.7F 1210 100V C28 NM 0805 SMA C35 2200pF 1812 2KV 3 C34 2200pF 1812 2KV C27 NM 0805 C26 NM 0805 100V T2 NM C22 2200pF 1812 D82KV 0805 R27 3Mega 2010 Input Filter Common Mode Filter PGND T3 Chassis Note synch MOSFET N ch 60 V 10 milli max Qt <30nc CoilCraft NA6083-BL Note Internal auxiliary voltage must be set between 9V and 10V from no load to full load SOD323 0805 9 8 7 VGS C47 D11 2.2F BZX84C10-NM 25V SOT23 0603 R62 NM 0805 G4 MMBT3906LT1 SOT23 C45 NM 25V 0603 NC COILCRAFT DA2319-AL A C46 1nF 0805 100V Q1 D10 BAS70 SOD323 Q2 C PGD Auxiliary voltage C48 100nF 6 R34 20R 0805 1 4 PGND 2 J4 R35 10K 3 R61 3.3K 0805 PowerFLAT 5x6 VSN 6 R31 NM Q3 MMBT3904LT1-NM SOT23 L4120nH STL110NS3LLH7 VSN 3 4 5 R28150R R30 NM 0805 TP9 turret V5V 1 DO3316H-121MLD D5 D6 D7 D8 R29 10R VSP C39 1nF 0805 C36 C40 C41 C37 C42 C38 100F 1210 16V X5RX5R 100F 1210 16V 100F 1210 16V X5RX5RX5RX5R 100F 1210 16V 100F 1210 16V 100F 1210 16V C43 C44 330F-NM 100nF 6.3V 0603 8x10.5 D15 R32 10R 0805 S1 S2 S3 D9 BAS70 12 11 10 1 2 R33 10K SGND J6 SGND turret TP10 Note Alternative synch MOSFET BSC039N06NS D12 BAS70 SOD323 VOUT Led 1 C23 1nF 0805 100V 1 0805 4 0R C21 2200pF 1812 2KV 2 VINpf 1 T4 R56 10K R37 0R NC1 D5 D6 D7 D8 BAS70 SOD323 0805 6 Q4 R40 10k C51 1nF 0805 100V 5 PowerFLAT 5x6 G4 R3610R 8 7 S1 S2 S3 11 10 12 9 GAT1 GAT2 VC R4591K PGND Note Alternative primary MOSFET BSC500N20NS3G R44 R100 1206 FSW BLK Ex Pad 1 17 DT 16 C52 100pF SS 15 1% C5333nF VIN U2 NC2 PM8804 16QFN_3X3X0.75_0.5 CTL PGD Note Primary MOSFET N ch 150-200V 50 milli max Qt <30nc FDMS86252 D13 MODE CS AGND R43 14 130K 0805 R108 R100 1206 C542200pF 4 13 1% 3 R412K2 0603 100nF25V R3810R 2 R42 6K8 C49 0805 C50 100nF 25V 0603 Power circuit 1% PGND R4682k 2KV 1812 SGND Note Feedback loop must be fine tuned taking into account also the overall capacitance due to the electronics circuits that the converter is powering PGND 1% R47 1K5 Fsw 300khz 82K SS 10ms 33nF DT 50ns 91K Blanking 70ns 130K R50 330R C56 NM Note PM8804 parameters must be fine tuned in the final application C58 150nF U3 4 1 3 2 R4810R FOD817AS SGND 3 R52 20k 1% C59 100pF PGND R49 0R C55 2.2F 25V 0603 C57 22nF R51 680R C60 R53 1% 47nF 3.3K 4 1 2 5 U4 TS431AILT SOT23-5 R54 15K 1% R55 12K 1% Feedback circuit SGND Figure 4. STEVAL-POE002V1 circuit schematic (4 of 4) V5V R106 0R 0805 D38 BAS70-NM SOD323 Note place the optional circuit on the bottom side. V5V U15 VSN PGD R112 330R 2 R113 0R 3 VGS VCC DVS GND VAUX GD TON C75 1uF 1 3 2 U14 SRK1000-NM D35 1N4148WS-NM R105 NM 6 FOD817AS R102 100R PGND 1 1 4 2 R109 0R D36 NM SOD323 R103 12K 1% C81 NM 0603 C78 NM R110 NM 5 R104 39K 1% 4 R111 47K C76 100p C74 NM 1 TS2431-NM SOT23 3 2 U12 3 4 1 2 5 U13 TS431AILT R101 NM 1% SOT23-5 SGND DB3628 - Rev 1 SGND page 3/5 STEVAL-POE002V1 Revision history Table 1. Document revision history DB3628 - Rev 1 Date Version 16-Oct-2018 1 Changes Initial release. page 4/5 STEVAL-POE002V1 IMPORTANT NOTICE - PLEASE READ CAREFULLY STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST's terms and conditions of sale in place at the time of order acknowledgement. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers' products. No license, express or implied, to any intellectual property right is granted by ST herein. Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product. ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners. Information in this document supersedes and replaces information previously supplied in any prior versions of this document. (c) 2018 STMicroelectronics - All rights reserved DB3628 - Rev 1 page 5/5