STEVAL-POE003V1 Data brief 5V/20A, active clamp forward converter, Power Over Ethernet (PoE) - IEEE 802.3bt compliant reference design Features * * Product summary Features of PM8805 PoE-PD interface - System in package integrating a double active bridge, hot-swap MOSFET and PoE-PD interface - PoE-PD single-signature interface compliant with IEEE 802.3bt - Detection and support of 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 IEEE802.3.af/at/bt classification indication through a combination of the T0, T1 and T2 signals (open drain) - VFQFPN43 8x8 mm with 6 exposed pads Features of 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 settable time - Soft turn off (optionally disabled) - Dual 1Apk, low side complementary gate drivers - GATE2 optionally turned off for reduced consumption - 80% maximum duty cycle with internal slope compensation - VFQFPN 3.0x3.0x1.0 16L 0.5 mm pitch WEEE compliant RoHS compliant high power PoE PD / 5 V up to 20 A active clamp forward evaluation board STEVALPOE003V1 * * PWM peak current mode controller for PoE and telecom systems PM8804 Description IEEE802.3bt PoE-PD interface with integrated dual-active bridge PM8805 This reference design represents a PoE Class 8 converter designed for high efficiency conversion over a wide load range. It is based on the PM8805 PoE-PD interface compliant with the IEEE802.3bt standard, and a DC-DC forward active clamp converter driven by the PM8804 PWM controller. The PM8805 system on package device embeds two active bridges and an IEEE802.3bt compliant Powered Device (PD) interface. It can be used in all mediumto-high power 2P and 4P high efficiency PoE and PoE+ applications such as point of sales and retail logistics devices. The PM8804 PWM controller represents an integrated solution for a smart and efficient 48 V converter, including 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. DB3653 - Rev 2 - May 2019 For further information contact your local STMicroelectronics sales office. www.st.com STEVAL-POE003V1 Specifications 1 Specifications Table 1. Specifications Parameter DB3653 - Rev 2 Specs Classification Class 8 Vin at RJ45 connector (J1) From 41.2 to 57 V Iin at RJ45 connector (J1) 1.0 A max each pair Vout 5 V +/- 2% Iout 20 A total max Max ouput power 100 W max Efficiency overall peak > 92% @ 13 A Vin at frontal jack connector (J9) 48 V +/- 2 V Iin at frontal jack connector (J9) 2.0 A total max Vin at rear jack connector (J10) 48 V +/- 2 V Iin at rear jack connector (J10) 2.5 A total max Operating temperature 0 - 50 C 20 A full load page 2/12 STEVAL-POE003V1 System board layout 2 System board layout Figure 1. PCB top assembly DB3653 - Rev 2 page 3/12 STEVAL-POE003V1 Efficiency measurements 3 Efficiency measurements The STEVAL-POE003V1 consists of a POE interface compliant with the last standard IEEE802.3bt, created with the PM8805 interface and a forward active clamp DC-DC converter that receives a DC voltage from POE interface. PM8805 device integrates two N-channel MOSFET bridges, one for every 2-pair of the POE interface, and an hotswap MOSFET placed in series with the outputs of two bridges. The following figure shows the efficiency of the single forward converter, and the overall efficiency that also includes the power losses of the POE interface. Figure 2. STEVAL-POE003V1 efficiency measurements The dotted lines give the overall efficiency of the STEVAL-POE003V1 at different DC input voltages applied to RJ45 connector J1. The continuous lines show the DC-DC forward efficiency, representing a figure of merit of the standalone converter. The following losses relating to the POE interface are not included: * RJ45 connector J1 * POE data transformer T1 * Common chokes T7, T8 placed on the two power supplies pairs * PM8805 interface that integrates dual power mos bridges and a hot swap MOSFET * Input filter of the forward converter This efficiency is measured between output test points TP8/TP9 and input test points TP5/TP6 of the forward converter. DB3653 - Rev 2 page 4/12 STEVAL-POE003V1 STEVAL-POE003V1 schematic diagrams 4 STEVAL-POE003V1 schematic diagrams Figure 3. STEVAL-POE003V1 circuit schematic (1 of 3) DB3653 - Rev 2 page 5/12 1 2 3 AUX Re ar J 10 TP 2 TP -Bla ck R121 20K 0805 TP 1 TP -Re d TP 4 TP -Bla ck C85 20K 0805 D41 S TP S 4S 200S S MC VDC AUXR VOB R69 100k 0805 BAT46J Raux +live PoE AUX Fro nt C86 NM 0805 R76 0R 0805 D14 S OD323 BAT46J R119 NM R77 0R R118 0R-NM D20 D40 S OD323 AutoClass R122 47K 0805 R120 4k3 STBY High 1 2 3 S TBY SS MODE P GD C84 1nF R67 0R-NM 0805 P1 S OD323 D37 R75 1k R0805 3 1 R131 0 R117 4k7 S OD323 D43 4 2 S LEEP/WKUP BAT46J AUXF BAT46J D42 S TP S 4S 200S S MC BAT46J TP 3 TP -Re d D45 R130 2.2K-NM 1% R129 6K8-NM 1% C83 1nF S OD323 FAUX R115 100k Q14 2N7002 S OT-23 Q13 2N7002 S OT-23 D39 BAT46J R128 10K 1% R132 NM S OD323 D47 1k R123 3 1 P2 D46 100k R116 D44 OVP S TBY C81 22nF D51 S OD323 GND CLS 1 R127 470K 1% FAUX_MAN RAUX_MAN D52 BAS 70-05 S OT23 OVP C82 1nF RAUX D53 BAS 70-05 S OT23 GND R114 4k7 S OD323 4 2 S HDN BAT46J DB3653 - Rev 2 BAS 70 J9 U24 3 1 2 2 FOD817AS 1 U22 3 2 R102 220 VB 4 S OT23 TS 2431-AILT-NM R133 100K S TBY FAUX RAUX R126 10 1% VB 5 3 4 1 C78 NM S OT23-5 TS 431AILT U23 R105 NM VOUT R103 12K 1% S GND R101 NM 1% R104 45K3 1% STEVAL-POE003V1 schematic diagrams STEVAL-POE003V1 Figure 4. STEVAL-POE003V1 circuit schematic (2 of 3) page 6/12 GND GND C34 2200pF 1812 2KV C21 2200pF 1812 2KV 270K R41 NM R43 130K C53 33nF R45 MODE SS 1 2 R26 0R 1206 4 3 R46 91K Cha s s is R27 3M-NM 2010 C23 1nF 0805 100V T2 NM P GD 1 2 3 4 1 0R L3 0R L2 AGND SS DT FS W C26 1nF 0805 100V 1 2 2 C27 NM 0805 U2 PM8804 AGND C52 100pF 12 11 10 9 17 R28 0R 0603 4.7uF 1210 100V C24 TP 12 TP -Re d C50 100nF 25V 0603 R78 0R 1206 C47 2.2uF 25V 0603 Q3 MMBT3904LT1-NM SOT23 R36 10R 0805 C51 1nF 0805 100V R62 NM 0805 R30 NM 0805 C28 NM 0805 TP 5 TP -Re d TP 6 TP -Bla ck C35 2200pF-NM 1812 2KV C22 2200pF-NM 1812 2KV R47 2K VC GAT2 P GND GAT1 Ex P a d C46 1nF 0805 100V D8 SMAJ58A S MA 16QFN_3X3X0.75_0.5 BLK 16 NC 4.7uF 1210 100V 4.7uF 1210 100V D13 BAS 16J S OD323 P GND R38 10R 0805 C45 100nF 25V 0603 Q4 4.7uF 1210 100V C33 R44 0R05 1210 R40 10k P GND R108 0R05 1210 G4 PowerFLAT 5x6 BS C190N15NS 3 D48 BAS 16J S OD323 D9 BAS 16J S OD323 P GND C32 C31 L9 1m H LP S 4018-105ML 1 2 D11 BZX84C10-NM S OT23 R31 NM 0603 Input Filte r C30 NM 0805 L1 Coilcra ft XAL5050-562 5.6uH 2 C29 33uF 100V 10x10.2 EEEFK2A330P 1 C A R24 5 NC1 8 VIN 6 P GD 7 NC2 CS 14 MODE 13 CTL 15 10 4 6 5 2 1 3 4 6 1 P owe r circuit D12 BAS 70 S OD323 TP 7 TP -Re d 2KV 1812 C54 2200pF G4 R25 10K 0603 9 8 7 12 11 10 T3 RA7129-BL 8 2 5 S GND S GND T4 P OE120P L-xxL_-NM 2KV 1812 C20 NM P GND C25 100nF 0603 D5 D6 D7 D8 S1 S2 S3 C48 47nF 200V 1206 G4 Q1 TP 14 TP -Re d C75 100pF 0805 50V R29 1K R17 22R C49 NM 1206 200V R15 NM 1206 S TL110NS 3LLH7 PowerFLAT 5x6 GS L Q7 FDMC86259P VS N VS P VS P VS N S1 S2 S3 D2 BZX84C10 S OT23 G4 Q5 C56 NM AGND C58 100nF R50 220R 1% S TL110NS 3LLH7 S GND R32 10R 0805 G4 Q10 P BS S 5240T-NM S OT23 R37 10K GS L PowerFLAT 5x6 GS H TP 13 TP -Re d C39 1nF 0805 NC Q9 P BS S 4240T S OT23 D1 BAS 16J S OD323 R16 5R6-NM 0805 C A 0R 1206 D5 D6 D7 D8 S1 S2 S3 D5 D6 D7 D8 D5 D6 D7 D8 3 4 R124 10R 0805 C95 1nF 0805 1 2 1 C96 2.2uF 25V 0603 D50 BAS 70 S OD323 R35 1K S GND U12 3 1 2 C41 47uF 1210 16V NC 2 R51 560R C60 22nF 4 1 C43 330uF 16V 8x10.5 TS431AILT S OT23-5 C59 220pF C57 22nF U4 R56 10K G4 C55 100nF 25V 0603 R54 15K 1% R53 4.7K 1% S GND TP 11 turre t R55 12k 1% R52 20k 1% C44 0.1uF 0603 25V D15 R61 3.3k 0805 Q8 STL110NS3LLH7-NM powe rFLAT 5x6 VOUT R49 0R C38 47uF 1210 16V TP 10 turre t R48 10R TP 9 TP -Bla ck C42 47uF 1210 16V TP 8 TP -Re d Q11 P BS S 5240T-NM S OT23 GS H Fe e dba ck circuit 5 3 C37 47uF 1210 16V D17 BZX84C10 S OT23 D16 BAS 16J S OD323 R33 5R6-NM 0805 Q12 P BS S 4240T S OT23 D49 BAS 70 S OD323 S OT23 TS2431-AILT-NM R125 47K C40 47uF 1210 16V R34 22R C76 100pF 0805 50V C36 47uF 1210 16V S GND VS N VS P L4 S ER2013-362L 2 S GND Q2 STL110NS3LLH7-NM powe rFLAT 5x6 U3 Fairchild FOD817AS S GND S1 S2 S3 D5 D6 D7 D8 S1 S2 S3 C A D5 D6 D7 D8 S1 S2 S3 DB3653 - Rev 2 J4 J6 VOUT Le d VDC STEVAL-POE003V1 schematic diagrams STEVAL-POE003V1 Figure 5. STEVAL-POE003V1 circuit schematic (3 of 3) page 7/12 STEVAL-POE003V1 Revision history Table 2. Document revision history DB3653 - Rev 2 Date Version 18-Oct-2018 1 03-May-2019 2 Changes Initial release. Updated document title. Minor changes to cover page Features and Description. page 8/12 STEVAL-POE003V1 Contents Contents 1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 2 System board layout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 Efficiency measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4 STEVAL-POE003V1 schematic diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 DB3653 - Rev 2 page 9/12 STEVAL-POE003V1 List of tables List of tables Table 1. Table 2. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 DB3653 - Rev 2 page 10/12 STEVAL-POE003V1 List of figures List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. DB3653 - Rev 2 PCB top assembly . . . . . . . . . . . . . . . . . . . STEVAL-POE003V1 efficiency measurements STEVAL-POE003V1 circuit schematic (1 of 3) STEVAL-POE003V1 circuit schematic (2 of 3) STEVAL-POE003V1 circuit schematic (3 of 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4 5 6 7 page 11/12 STEVAL-POE003V1 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. 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(c) 2019 STMicroelectronics - All rights reserved DB3653 - Rev 2 page 12/12