STEVAL-POE006V1 Data brief 3.3V/20A, active clamp forward converter, Power Over Ethernet (PoE) IEEE 802.3bt compliant reference design Features * * Product summary High power PoE PD, 3 V up to 20 A active clamp forward evaluation board STEVALPOE006V1 PWM peak current mode controller for PoE and telecom systems PM8804 IEEE802.3bt PoE-PD interface with integrated dual-active bridge PM8805 Features of the PM8805 PoE-PD interface: - System in package integrating a double active bridge, a hot-swap MOSFET and a PoE-PD - Supports legacy high power, 4-pair applications - 100 V N-ch MOSFETs with 0.2 total path resistance for each active bridge - Identifies which kind of PSE (standard or legacy) it is connected to and provides successful IEEE 802.3af/at/bt classification indication as a combination of the T0, T1 and T2 signals (open drain) - Smart operation mode selection through the STBY, FAUX and RAUX control signals - QFN 56 8x8mm package with 43 pins and 6 exposed pads Features of the PM8804 PWM controller: - PWM peak current mode controller - Input operating voltage up to 75 V - Internal high voltage start up regulator with 20 mA capability - Programmable fixed frequency up to 1 Mhz - Soft startup with settable time - Soft turn off (optionally disabled) - Dual 1 APK, low side complementary gate drivers - - - GATE2 can be turned off for reduced consumption 80% maximum duty cycle with internal slope compensation QFN 16 3x3mm package with exposed pad Description This reference design represents a 3.3 V, 20 A converter solution ideal for various applications including wireless access points, supplied with a PoE-PD interface and a DC-DC active clamp forward converter. The PoE-PD interface is based on the PM8805 system in package device with two active bridges and an IEEE 802.3bt compliant Powered Device (PD) interface. It can be used in all medium-to-high power 2P and 4P high efficiency PoE and PoE+ applications. The DC-DC active clamp forward converter is designed around the PM8804 PWM controller, which is an integrated solution for smart and efficient 48 V converters, featuring a programmable oscillator for the switching frequency, adjustable slope compensation, dual complementary low-side drivers with programmable dead time, programmable soft start, soft turn off and a programmable current sense blanking time. DB3669 - Rev 3 - June 2019 For further information contact your local STMicroelectronics sales office. www.st.com STEVAL-POE006V1 STEVAL-POE006V1 schematic diagrams 1 Schematic diagrams Figure 1. STEVAL-POE006V1 circuit schematic (1 of 3) DB3669 - Rev 3 page 2/5 STEVAL-POE006V1 STEVAL-POE006V1 schematic diagrams Figure 2. STEVAL-POE006V1 circuit schematic (2 of 3) TP3 TP-Red CLS1 AUXF D42 STPS4S200S SMC J9 1 2 3 VOB VDC R121 20K 0805 AUX Rear RAUX FAUX 1 D39 4 P2 2 3 R75 1k R0805 VB D44 4 D45 SOD323 R117 4k7 D47 SOD323 BAT46J D43 SOD323 R115 100k BAT46J D37 SOD323 R123 1k C84 1nF R120 4k3 SHDN P1 R77 0R C85 20K 0805 2 3 BAT46J D41 STPS4S200S SMC 1 2 3 R119 NM R76 0R 0805 1 R67 0R-NM 0805 BAT46J TP1 TP-Red J10 R118 0R-NM Raux +live PoE AUXR TP4 TP-Black D20 D40 SOD323 BAT46J R69 100k 0805 SLEEP/WKUP STBY D14 SOD323 STBY High BAT46J C86 NM 0805 AutoClass AUX Front VB BAT46J R122 47K 0805 R116 D46 100k SOD323 R114 4k7 C83 1nF R126 10 1% C82 1nF GND RAUX_MAN D52 BAS70-05 SOT23 OVP TP2 TP-Black RAUX FAUX_MAN D53 BAS70-05 SOT23 FAUX OVP STBY STBY VOUT R128 10K 1% U22 R132 NM 4 PGD 1 3 R105 NM 2 R104 27K 1% D51 SOD323 MODE Q13 2N7002 SOT-23 R130 2.2K-NM 1% BAS70 FOD817AS R129 6K8-NM 1% R102 100 C78 NM R133 100K 3 1 C81 22nF R127 470K 1% U24 2 SOT23 TS2431-AILT-NM GND 4 1 2 5 3 R103 82K 1% R101 15K 1% U23 TS431AILT SOT23-5 R131 0 SS SGND GND Q14 2N7002 SOT-23 Figure 3. STEVAL-POE006V1 circuit schematic (3 of 3) TP5 TP-Red 1 4 C23 1nF 0805 100V T2 NM 2 3 C26 1nF 0805 100V 1 R27 3M-NM 2010 C27 NM 0805 L3 D8 SMAJ58A SMA 2 C28 NM 0805 C35 2200pF-NM 1812 2KV C29 33uF 100V 10x10.2 EEEFK2A330P 4.7uF 1210 100V VSN C30 NM 0805 D1 BAS16J SOD323 VSP C31 C32 C33 4.7uF 1210 100V 4.7uF 1210 100V 4.7uF 1210 100V R17 22R-NM PGND TP6 TP-Black 2 8 4 10 C75 100pF-NM 0805 50V GSL Q9 PBSS4240T-NM SOT23 T4 POE120PL-xxL_-NM Input Filter NC R33 5R6 0805 Q2 STL110NS3LLH7-NM powerFLAT 5x6 G4 R37 10K D16 BAS16J SOD323 VSN R34 22R-NM NC C76 100pF-NM 0805 50V SGND Chassis GSH Q12 PBSS4240T-NM SOT23 R35 1K-NM Q10 PBSS5240T-NM SOT23 D2 BZX84C10-NM SOT23 D5 D6 D7 D8 R16 5R6 0805 SGND R29 1K-NM 0R R26 0R 1206 VSP C20NM 2KV 1812 C24 Q8 STL110NS3LLH7-NM powerFLAT 5x6 G4 R56 10K S1 S2 S3 L1 Coilcraft XAL5050-562 5.6uH 2 C 1 C22 2200pF-NM 1812 2KV D5 D6 D7 D8 2 Q11 PBSS5240T-NM SOT23 D17 BZX84C10-NM SOT23 A GND C34 2200pF 1812 2KV L2 0R C 1 C21 2200pF 1812 2KV A 0R 1206 VDC S1 S2 S3 R24 SGND 5 This circuit goes on the bottom side under the equivalent circuit on the top side 1 6 TP13 TP-Red T3 MA5509-BL 12 11 10 VSP Q3 MMBT3904LT1-NM SOT23 R62 NM 0805 C47 2.2uF 25V 0603 6 C45 100nF 25V 0603 D11 BZX84C10-NM SOT23 NC D5 D6 D7 D8 Q1 GSL D48 BAS16J SOD323 C54 2200pF STL110NS3LLH7 2KV 1812 D15 TP11 turret TP9 TP-Black R49 0R U3 Fairchild FOD817AS D13 BAS16J SOD323 R15 NM 1206 C49 NM 1206 200V C56 NM R40 10k C25 100nF 0603 R44 0R22 1210 R108 0R05 1210 PGND D12 BAS70 SOD323 Q7 FDMC86259P G4 4 1 3 2 R48 12R R50 220R 1% C58 100nF D5 D6 D7 D8 C50 100nF 25V 0603 C48 47nF 200V 1206 G4 10 12 MODE C52 100pF C44 0.1uF 0603 25V J6 SGND R51 820R D50 BAS70 SOD323 R125 47K R25 10K 0603 D49 BAS70 SOD323 C60 22nF 1 U12 C96 2.2uF 25V 0603 C57 22nF C59 220pF AGND S1 S2 S3 9 11 MODE 3 C55 100nF 25V NM R52 20k 1% SGND R53 4.7K 1% 3 2 SOT23 TS2431-AILT-NM 4 1 2 5 U4 TS431AILT SOT23-5 R54 15K 1% R55 12k 1% Power circuit SGND DB3669 - Rev 3 C38 47uF 1210 16V C42 47uF 1210 16V C43 330uF 16V 8x10.5 SGND D5 D6 D7 D8 R38 10R 0805 TP12 TP-Red 13 BLK 17 R47 2K R41NM AGND C37 47uF 1210 16V R124 10R 0805 R32 10R 0805 SGND S1 S2 S3 VIN 6 7 5 NC1 NC2 PGD 8 GAT2 VC 16 R43130K PGND 16QFN_3X3X0.75_0.5 AGND CS SS GAT1 PM8804 DT SS C41 47uF 1210 16V PowerFLAT 5x6 Ex Pad U2 FSW CTL 1 15 3 2 14 4 C53 33nF C40 47uF 1210 16V TP7 TP-Red Q4 BSC190N15NS3 R45200K C36 47uF 1210 16V PGND R78 0R 1206 R4691K C95 1nF 0805 STL110NS3LLH7 Synchronous rectifiers PGND C51 1nF 0805 100V G4 PowerFLAT 5x6 PowerFLAT 5x6 C39 1nF 0805 R61 1.5k 0805 G4 GSH VSN 5 A C46 1nF 0805 100V Q5 9 8 7 2 1 D9 BAS16J SOD323 R31 NM 0603 C PGD L9 1mH LPS4018-105ML 2 S1 S2 S3 R30 NM 0805 1 J4 D5 D6 D7 D8 TP14 TP-Red Auxiliary voltage R28 150R 0603 VOUT TP10 turret TP8 TP-Red L4 SER2011-202L 1 2 VOUT Led 3 4 S1 S2 S3 R36 10R 0805 Feedback circuit page 3/5 STEVAL-POE006V1 Revision history Table 1. Document revision history DB3669 - Rev 3 Date Version 20-Dec-2018 1 07-May-2019 2 14-Jun-2019 3 Changes Initial release. Updated document title. Minor changes to cover page Features and Description. Minor text changes. page 4/5 STEVAL-POE006V1 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. 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