STEVAL-POE005V1 Data brief 12V/8A, active clamp forward converter, Power Over Ethernet (PoE) IEEE 802.3bt compliant reference design Features * * Product summary High power PoE PD, 12 V up to 8 A active clamp forward evaluation board STEVALPOE005V1 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) is connected to, and provides successful IEEE802.3 af /at /bt classification indication as combination of the T0, T1 and T2 signals (open drain) - Smart operational 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 start up with adjustable time - Soft turn off (optionally disabled) - Dual 1 APK, low side complementary gate drivers - - - GATE2 optionally 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 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. DB3699 - Rev 2 - May 2019 For further information contact your local STMicroelectronics sales office. www.st.com STEVAL-POE005V1 Efficiency 1 Efficiency The STEVAL-POE005V1 reference design consists of a PoE interface compliant with the IEEE 802.3bt standard and a forward active clamp DC-DC converter that receives DC voltage from the PoE interface. The figure below shows the efficiency of a single forward converter and the overall efficiency including the PoE interface power losses. Figure 1. STEVAL-POE005V1 overall and DC-DC forward efficiency The dotted lines indicate the STEVAL-POE005V1 efficiency at different DC input voltages applied to RJ45 connector J1. The continuous line indicates the DC-DC forward efficiency, which does not include the following losses associated with the PoE interface section: * RJ45 connector J1 * PoE data transformer T1 * common chokes T7 and T8 placed on the two power supply pairs * PM8805 interface that integrates the dual power MOS bridges and a hot swap MOSFET * Forward converter input filter This efficiency is measured between output test points TP8/TP9 and input test points TP5/TP6 of the forward converter. DB3699 - Rev 2 page 2/7 Chassis U16 SM15T68CA VB C12 1nF 0805 250V B88069X9231T203-NM RV1 C7 1nF-NM 1812 2KV C6 1nF-NM 1812 2KV Green R18 3.9K T2 D4 U5 SMC SM15T68CA T8 C9 1nF-NM 1812 2KV R19 3.9K T1 D5 VB NM 0805 R59 C11 1nF 0805 250V T0 D6 0805 R60 T2 T1 T0 R20 3.9K NM FAUX RAUX L7 C2 10nF 0805 250V R6 75R 0603 NM L8 2 C97 47K 0603 STBY L6 2 Green Orange R22 51R1 1% 0805 U7 SMC NM U21 SMA NM TP17 TP-Red Ferrite bead 0805 1 C62 33nF 0805 100V C13 100nF 0805 100V Chassis IN36 R23 36R5 1% 0805 CLS1 U6 SMC NM C63 33nF 0805 100V 2 Ferrite bead 0805 1 L5 24 23 22 21 20 19 18 17 16 15 14 13 U11 SMC NM Brown U20 SMA NM Chassis U8 SMC NM TP16 TP-Red 2 1 12 EP4 2 3 4 5 6 7 8 9 10 11 EP1 1 C93 C92 10nF-NM 10nF-NM 1210 1210 C 94 1KV C91 1KV 10nF-NM 10nF-NM 1210 1KV 1210 1KV TP18 TP-Red IN78 C61 33nF 0805 100V IN45 Blue Wurth 7490220123 3 4 5 6 8 7 9 10 11 12 T1 Mounted Wurth 7490220123 Coilcraft WA8704-ALD ExPad IN78 IN12 ExPad VB STBY CLS1 CLS2 AGND T0 T1 T2 FAUX RAUX U1 PM8805 TP15 TP-Red IN36 ExPad VOUT VOUT NC PGD CTRL VCP DET VDD VOB ExPad ExPad ExPad IN45 VOB C5 2.2nF 2KV 1812 0603 R475R 0603 R375R 0603 R275R 0603 R175R QFN56-8X8X1-49PIN their final value could be selected from table based on the output power and Type of the PD. NOTE for Class1 and Class2 resistors C98 47K 0603 Ferrite bead 0805 1 C64 33nF 0805 100V 0805 R58 2 NM T5 NM 0805 R57 Chassis IN12 C4 10nF 0805 250V C3 10nF 0805 250V C10 1nF 2KV 1812 R8 75R 0603 R7 75R 0603 Ferrite bead 0805 1 T7 C1 10nF 0805 250V U19 SM15T68CA R5 75R 0603 U10 SMC SM15T68CA T6 NM B88069X9231T203-NM RV2 C8 U17 1nF-NM SM15T68CA 1812 U18 SM15T68CA 2KV Brown Blue 1 2 10 9 DATA & POWER INPUT 4 3 1 2 Orange RN102-2-02-1M1 1 J1 1 2 3 4 RN102-2-02-1M1 1 2 3 4 5 6 7 8 4 3 4 3 2 T1 43 42 GND78 GND78 41 40 IN12 IN12 15 16 GND12 GND12 13 14 IN78 IN78 37 36 IN45 IN45 35 34 GND45 GND45 39 38 VOB VOB VOB VOB 17 18 IN36 IN36 19 20 GND36 GND36 21 22 23 EP3 28 27 26 25 24 32 31 30 29 EP6 EP5 EP2 33 C90 10nF-NM 1210 C88 10nF-NM 1210 C19 10nF 0805 100V C14 10nF 100V R14 26.1K 1% VOB C87 10nF-NM 1KV1210 1KV C89 10nF-NM 1KV1210 1KV 3 SMAJ58A D7 SMA D3 BAV70 2 DB3699 - Rev 2 U9 SMC NM C18 1.5nF 0603 100V Chassis Chassis J2 R21 NM 0805 2010 R90R R107 EEEFK2A330P C17 100nF 0805 100V TP20 TP-Red TP19 TP-Red 4.7uF 1210 100V C16 SGND 0R0 C15 33uF 100V 10x10.2 DATA OUTPUT 1 2 3 4 5 6 7 8 10 9 PGD GND VDC NOTE for Capacitors Where not indicated the body is 0603, the voltage is 100V material X7R and tolerance 10% 100nF 100V is X7R 10%0805. NOTE for Resistors Where not indicated the body is 0603 and tolerance 5% 2 1 Chassis STEVAL-POE005V1 schematic diagrams STEVAL-POE005V1 STEVAL-POE005V1 schematic diagrams Figure 2. STEVAL-POE005V1 circuit schematic (1 of 3) page 3/7 DB3699 - Rev 2 1 2 3 C85 20K 0805 VDC R119 NM R77 0R R118 0R-NM D40 D20 SOD323 R120 4k3 STBY High TP2 TP-Black R121 20K 0805 R76 0R 0805 D14 SOD323 R131 0 R117 4k7 SOD323 D43 R130 2.2K-NM 1% R129 6K8-NM 1% C83 1nF SOD323 D45 R115 100k Q14 2N7002 SOT-23 Q13 2N7002 SOT-23 D39 R128 10K 1% BAT46J P2 R132 NM SOD323 D47 1k R123 3 1 D46 100k R116 OVP STBY C81 22nF D51 SOD323 GND R127 470K 1% FAUX_MAN RAUX_MAN D52 BAS70-05 SOT23 OVP C82 1nF D53 BAS70-05 SOT23 GND R114 4k7 SOD323 4 2 D44 CLS1 BAS70 SS SOD323 D37 R75 1k R0805 P1 4 SHDN BAT46J MODE PGD C84 1nF R67 0R-NM 0805 3 12 SLEEP/WKUP RAUX AUX Rear 1 2 3 R69 100k 0805 BAT46J D41 STPS4S200S SMC AUXR VOB AUXF BAT46J TP1 TP-Red C86 NM 0805 D42 STPS4S200S SMC STBY TP4 TP-Black R122 47K 0805 TP3 TP-Red FAUX J10 AUX Front J9 SOT23 U24 3 1 2 2 FOD817AS 1 3 U22 2 R102 1K VB 4 TS2431-AILT R133 100K STBY FAUX RAUX R126 10 1% VB 4 1 U23 C78 NM 5 TS431AILT-NM SOT23-5 3 R105 330R VOUT R103 12K 1% SGND R101 NM 1% R104 56K 1% STEVAL-POE005V1 schematic diagrams STEVAL-POE005V1 Figure 3. STEVAL-POE005V1 circuit schematic (2 of 3) BAT46J BAT46J BAT46J AutoClass Raux +live PoE page 4/7 GND GND C34 2200pF 1812 2KV C21 2200pF 1812 2KV R41NM R43130K C53 10nF MODE SS 1 R26 0R 1206 4 3 2 R45330K R4691K Chassis R27 3M-NM 2010 C23 1nF 0805 100V T2 NM PGD 1 2 3 4 1 0R L3 0R AGND SS DT FSW C26 1nF 0805 100V 1 2 2 C27 NM 0805 PM8804 U2 AGND C52 100pF 12 11 10 9 17 R28 0R 0603 TP12 TP-Red C50 100nF 25V 0603 R78 0R 1206 C47 2.2uF 25V 0603 Input Filter NC D13 BAS16J SOD323 PGND R38 10R 0805 C45 100nF 25V 0603 D11 BZX84C10-NM SOT23 R31 NM 0603 4.7uF 1210 100V 4.7uF 1210 100V Q4 4.7uF 1210 100V C33 R44 0R05 1210 R40 10k PGND R108 0R100 1210 G4 PowerFLAT 5x6 BSC190N15NS3 D48 BAS16J SOD323 D9 BAS16J SOD323 PGND C32 C31 L9 1mH LPS4018-105ML 1 2 C30 NM 0805 L1 Wurth 74439346056 5.6uH 2 C29 33uF 100V 10x10.2 EEEFK2A330P 1 Auxiliary voltage 4.7uF 1210 100V C24 Q3 MMBT3904LT1-NM SOT23 R36 10R 0805 C51 1nF 0805 100V R62 NM 0805 R30 NM 0805 C28 NM 0805 TP5 TP-Red TP6 TP-Black C35 2200pF-NM 1812 2KV C22 2200pF-NM 1812 2KV R47 2K VC GAT2 PGND GAT1 Ex Pad C46 1nF 0805 100V D8 SMAJ58A SMA 16QFN_3X3X0.75_0.5 BLK 16 L2 15 CTL C A R24 5 NC1 8 VIN 6 PGD 7 NC2 CS 14 MODE 13 6 5 2 1 3 4 6 Power circuit D12 BAS70 SOD323 TP7 TP-Red 2KV 1812 C54 2200pF G4 R25 10K 0603 9 8 7 12 11 10 SGND T3 750370225 Rev 03 10 4 5 8 2 1 SGND T4 POE120PL-xxL_-NM 2KV 1812 C20NM PGND C25 100nF 0603 D5 D6 D7 D8 S1 S2 S3 0R 1206 C48 47nF 200V 1206 D6 D7 D8 Q1 C49 NM 1206 200V R15 NM 1206 PowerFLAT 5x6 G4 STL90N6F7 GSL Q7 FDMC86259P VSN TP14 TP-Red VSP VSN C75 100pF 0805 50V R29 1K R17 22R C56 NM AGND C58 100nF R50 390R 1% STL90N6F7 G4 Q5 Synchronous rectifiers SGND R32 10R NM 0805 G4 Q10 PBSS5240T-NM SOT23 R37 10K GSL PowerFLAT 5x6 GSH TP13 TP-Red D2 BZX84C10 SOT23 D1 BAS16J SOD323 C39 1nF NM 0805 VSP NC Q9 PBSS4240T SOT23 R16 5R6-NM 0805 3 4 VSN C76 100pF 0805 50V R35 1K R34 22R NC R124 18R 0805 C95 1nF 0805 1 L4 7443631000 2 1 C96 2.2uF 25V 0603 D50 BAS70 SOD323 2 U12 D49 BAS70 SOD323 C40 47uF 1210 16V NM SOT23 TS2431-AILT R125 47K SGND SGND C36 47uF 1210 16V 3 1 2 C41 47uF 1210 16V NM 2 R51 2K C60 22nF 4 1 G4 TP8 TP-Red TS431AILT-NM SOT23-5 TP11 turret R55 5K23 1% R52 20k 1% C44 100nF 0603 25V D15 R61 10k 0805 powerFLAT 5x6 Q8 STL90N6F7-NM VOUT R49 0R C38 47uF 1210 16V TP10 turret R54 4K64 1% NM R53 4.7K 1% C59 220pF D5 D6 D7 D8 R48 0R C55 100nF 25V 0603 SGND TP9 TP-Black C42 47uF C43 1210 100uF 16V 16V 6.3x5.8mm NM C57 22nF NM U4 R56 10K Q11 PBSS5240T-NM SOT23 GSH Feedback circuit 5 3 C37 47uF 1210 16V D17 BZX84C10 SOT23 D16 BAS16J SOD323 R33 5R6-NM 0805 Q12 PBSS4240T SOT23 This circuit at the bottom side under the equivalent circuit of the top side SGND U3 Fairchild FOD817AS SGND Q2 STL90N6F7-NM powerFLAT 5x6 VSP J4 J6 VOUT Led S1D5 S2 S3 D5 D6 D7 D8 S1 S2 S3 C A D5 D6 D7 D8 S1 S2 S3 D5 D6 D7 D8 S1 S2 S3 C A DB3699 - Rev 2 S1 S2 S3 VDC STEVAL-POE005V1 schematic diagrams STEVAL-POE005V1 Figure 4. STEVAL-POE005V1 circuit schematic (3 of 3) page 5/7 STEVAL-POE005V1 Revision history Table 1. Document revision history DB3699 - Rev 2 Date Version 05-Oct-2018 1 07-May-2019 2 Changes Initial release. Updated document title. Minor changes to cover page Features and Description. page 6/7 STEVAL-POE005V1 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. 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