STEVAL-POE002V1

STEVAL-POE002V1 Data brief 5V/8A, synchronous flyback converter, Power over Ethernet (PoE) IEEE 802.3bt compliant reference design Features PM8805 4-pair 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 V DC Output stage managed by configurable PM8804 controller Output voltage: 5 V 2.5% DC 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 700 mV Switching frequency 280 KHz Description The STEVAL-POE002V1 reference design is a two-stage converter for a powered device (PD), and is able to deliver up to 40 W (5 V/8 A) DC from appropriate 4-pair PoE power sourcing equipment (PSE), or an external auxiliary supply. The first stage is the Ethernet interface is based on the PM8805 controller with integrated full active bridge rectification. The PoE controller is compliant with the third generation IEEE 802.3bt specification (as well as the preceding 802.3af/at standards), with improved features and increased power capacity that allow new application possibilities for PoE networks, including point of sales and retail logistics Product summary devices. PoE-PD converter based STEVAL- The second stage is the DC-DC converter designed around a fixed frequency flyback on PM8804 and PM8805 POE002V1 topology managed by the configurable PM8804 PWM controller, with secondary PWM peak current mode synchronous rectification via a gate driver transformer. controller for PoE and PM8804 telecom systems IEEE802.3bt PoE-PD interface with integrated PM8805 dual-active bridge DB3628 - Rev 2 - May 2019 www.st.com For further information contact your local STMicroelectronics sales office.STEVAL-POE002V1 STEVAL-POE002V1 schematic diagrams 1 STEVAL-POE002V1 schematic diagrams Figure 1. STEVAL-POE002V1 circuit schematic (1 of 4) Chassis Chassis T1 12 1 1 13 2 2 3 3 11 4 J2 4 5 J1 5 14 6 Orange 6 7 R175R 7 15 10 8 8 0603 16 9 Chassis Chassis Green 17 Data output 8 R275R Data and power input 18 7 0603 6 19 5 Blue 20 R375R 21 4 0603 22 3 Brown 23 2 R475R 24 1 0603 R5 R6 R7 R8 ETH1-460 75R 75R 75R 75R 0603 0603 0603 0603 C1 C2 C3 C4 10nF 10nF 10nF 10nF 0603 0603 0603 0603 C6 C7 C8 C9 100V 100V 100V 100V C5 SM15T68CA U16 NM NM NM NM U19 2.2nF U17 U18 C10 SMC SMC 2KV 1812 1812 SMC SMC 1812 1812 2.2nF SM15T68CA 1812 SM15T68CA 1KV 1KV SM15T68CA 1KV 1KV 2KV R90R 1812 2010 RV1 RV2 Chassis Note for surge arrester: B88069X9231T203-NM B88069X9231T203-NM L5 foreseen on PCB footprint for R57 1 2 IN45 Blue B88069X9231T203 NM0805 Ferrite bead 0805 Note for Class1 and Class2 resistors: C62 U10 U20 C11 T7 T5 1nF their final value could be selected from the table SMC SMC 1 nF 0805 0603 NM NM 744272102 NM based on the output power and Type of the PD. 100V 100V L6 R58 1 2 IN78 Brown NM 0805 Ferrite bead 0805 U11 U8 SMC SMC NM NM L7 R59 1 2 IN12 Orange NM0805 Chassis Ferrite bead 0805 C64 U5 U21 C12 T8 T6 1nF SMC SMC 1 nF NM 744272102 0805 NM 0603 NM 100V 100V L8 R60 1 2 Green NM 0805 Ferrite bead 0805 U6 U7 SMC SMC NM NM Chassis VOB VOB R14 100V 0805 26.1K 100nF 1% Note for T0 T1 T2 signals: EP1 EP2 C13 1 ExPad ExPad 33 they might not be used IN78 IN45 BAV70 32 C65 VB 2 VCP 31 VB D3 3 VB DET 30 NM STBY 4 STBY VDD 29 C14 0805 5 CLS1 U1 VOB EP6 10nF 100V R107 D4 D5 D6 CLS2 ExPad 100V 6 EP5 PGD T2 T1 T0 AGND ExPad 7 PM8805 0R0 T0 8 28 T1 VOUT VDC 9 QFN56-8X8X1-49PIN 27 Note for resistors: T2 VOUT 10 26 FAUX FAUX NC R21 where not indicated the body is 0603 and tolerance 5% 11 25 R18 R19 R20 RAUX RAUX PGD NM 24 3.9K 3.9K 3.9K CTRL 0805 C15 Note for capacitors: T0 12 23 IN12 IN36 33uF-NM CLS1 EP4 EP3 where not indicated the body is 0603, the voltage is 100 V ExPad ExPad C16 T1 C17 material X7R and tolerance 10% R10 4.7uF 100nF 100V T2 1k 1210 0805 100 nF 100 V is X7R 10% 0805. R23 R22 C18 10x10.2 D7 U9 0805 100V 100V 36R5 150R 470 pF C19 SMA SMC 1% 1% 0603 100nF SM15T68CA VB 0805 0805 NM 100V 0805 100V GND Figure 2. STEVAL-POE002V1 circuit schematic (2 of 4) CLS1 AUXF SMC J9 STTH302S 1 VOB VB 2 VB 3 D42 D14 D20 D40 R122 SLEEP/WKUP SHDN SOD323 SOD323 47K D39 C86 D44 AUX Front 1 2 1 2 0805 NM 0805 3 4 3 4 R69 P1 P2 100k R67 R118 0805 0R-NM 0R-NM 0805 R75 AUXR R123 1k R0805 1k R119 R76 R77 0R 100k 0R-NM R115 R116 100k D47 D46 100k SMC D37 D43 D45 J10 SOD323 SOD323 STTH302S SOD323 SOD323 SOD323 1 VDC 2 3 D41 R121 47K C85 R117 R114 C82 R120 C84 C83 AUX Rear 0805 NM 3k9 3k9 3k9 10nF 10nF 10nF 0805 GND RAUX RAUX FAUX FAUX STBY STBY DB3628 - Rev 2 page 2/5 9 10 2 1 3 4 2 1 Raux +live PoE BAT46J 3 4 2 1 3 4 2 1 3 4 BAT46J AutoClass STBY High STBY 13 43 14 GND12 GND78 42 GND12 GND78 15 41 16 IN12 IN78 40 IN12 IN78 17 39 VOB VOB 18 38 VOB VOB 19 37 BAT46J IN36 IN45 20 36 IN36 IN45 21 35 GND36 GND45 22 34 GND36 GND45 BAT46J BAT46J 1 3 2 FAUX 9 10 BAT46J BAT46J RAUX