PoE synchronous flyback, IEEE802.3at compliant, 3.3 V - 6 A · PDF fileobtain a flyback CCM...

May 2015 DocID027783 Rev 1 1/31

31

AN4687Application note

PoE synchronous flyback, IEEE802.3at compliant, 3.3 V - 6 A PDconverter based on the PM8803 controller

Roberto Baragetti

Introduction

This document describes a reference design for a PoE+, high efficiency, 3.3 V - 6 A flyback converter based on the PM8803 PoE controller.

The PM8803 is highly integrated device embedding an IEEE802.3at compliant “Powered Device” (PD) interface together with a PWM controller and support for auxiliary sources.

The STEVAL-TSP009V2 reference design is based on an isolated flyback topology CCM converter with synchronous rectification and gate driver transformer. The same PCB can be populated in different ways to support various configurations and topologies (flyback with diode rectification, synchronous flyback with or without active clamp, self-driven synchronous flyback).

Figure 1. STEVAL-TSP009V2 evaluation board photo

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Contents AN4687

2/31 DocID027783 Rev 1

Contents

1 Main characteristics and circuit description . . . . . . . . . . . . . . . . . . . . . 4

2 Schematic and BOM for 3.3 V at 6 A . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.1 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.2 Bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3 Measurements results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.1 Efficiency comparison with three rectification bridge options . . . . . . . . . . 14

3.2 Converter efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.3 Voltage ripple . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.4 Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3.5 Primary side waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.6 Secondary side waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.7 Load transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3.8 PoE to auxiliary switchover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3.9 Gloop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4 Support material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

4.1 PCB layers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

5 Electrical diagram general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

DocID027783 Rev 1 3/31

AN4687 List of figures

31

List of figures

Figure 1. STEVAL-TSP009V2 evaluation board photo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Figure 2. STEVAL-TSP009V2 circuit schematic (1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Figure 3. STEVAL-TSP009V2 circuit schematic (2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Figure 4. Schematic Schottky bridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Figure 5. Schematic full active bridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Figure 6. Schematic half active bridge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Figure 7. Comparison efficiency bridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Figure 8. Overall and DC/DC efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Figure 9. Output voltage drift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Figure 10. Ripple on 3.3 V at 0.6 A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Figure 11. Ripple on 3.3 V at 6 A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Figure 12. Ripple before and after input filter with 3.3 V at 0.6 A

(measured on C26 and C28) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Figure 13. Ripple before and after input filter with 3.3 V at 6 A

(measured on C26 and C28) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Figure 14. Startup from Microsemi 9001G injector - 3.3 V at 0.6 A . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Figure 15. Startup from Microsemi 9001G injector - 3.3 V at 6 A . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Figure 16. Startup from Microsemi 9501G injector - 3.3 V at 0.6 A . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Figure 17. Startup from Microsemi 9501G injector - 3.3 V at 6 A . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Figure 18. Detail of the output voltage at startup with no load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Figure 19. Detail of the output voltage at startup with 6 A load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Figure 20. Primary steady state 0.6 A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Figure 21. Primary steady state 6 A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Figure 22. Detail of primary drain at 6 A load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Figure 23. Secondary steady state 0.6 A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Figure 24. Secondary steady state 6 A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Figure 25. Detail of secondary drain at 6 A load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Figure 26. Secondary steady state 0.6 A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Figure 27. Secondary steady state 6 A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Figure 28. Detail of secondary drain at 6 A load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Figure 29. Gloop 48 V at 6 A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Figure 30. Gloop 48 V at no load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Figure 31. Gloop 40 V at 6 A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Figure 32. Gloop 57 V at no load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Figure 33. PCB top assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25Figure 34. PCB bottom assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25Figure 35. PCB layer 1 top. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Figure 36. PCB layer 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Figure 37. PCB layer 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Figure 38. PCB layer 4 bottom. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27Figure 39. Schematic 1 of 2 (general) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28Figure 40. Schematic 2 of 2 (general) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Main characteristics and circuit description AN4687

4/31 DocID027783 Rev 1

1 Main characteristics and circuit description

The main characteristics (reference and electrical specifications) of the converter are listed in Table 1 and Table 2.

This document details the characteristics and performances of the PM8803 evaluation kit STEVAL-TSP009V2, which has been designed to cover a broad range of Power over Ethernet (PoE) applications.

The PM8803 is a highly integrated device embedding an IEEE802.3af/at compliant powered device (PD) interface together with a PWM controller and support for auxiliary sources.

Table 1. Reference

Reference code

Device PM8803

Evaluation board STEVAL-TSP009V2

Table 2. Electrical specification

Parameter Specifications

Input voltage supplies VIN [VDC] From 40 to 60 V

Auxiliary input voltage range From 30 to 60 V

Output voltage VOUT [VDC] 3.3 VDC ±5% at 6 A

Peak to peak output ripple < 25 mVPP

Efficiency DC-DC at full-load > 90%

Efficiency overall at full load > 87%

Transient response ∆VOUTPK to 50% load step < 250 mV

∆VOUT in load line case < 0.5%

GLOOP bandwidth > 4 kHz

GLOOP phase margin at 0 dB > 60 deg.

GLOOP dB margin at 0 deg. > 10 dB

DocID027783 Rev 1 5/31

AN4687 Main characteristics and circuit description

31

Even though PM8803 device can be configured to work in several isolated topologies, self-driven or a transformer gate driven; this application note focuses on a high efficiency isolated flyback converter topology with synchronous rectification, 3.3 V output voltage with 6 A output current capability.

Auxiliary sources can be connected to the board on two different input connectors. One input (AUX II) allows prevalence of the auxiliary sources with respect to the PoE, while the other input ( AUX I ) allows the usage of a wall adaptor with voltage lower than the internal PoE UVLO threshold and still benefits from the inherent inrush and DC current limit.

The possible configurations supported by the PM8803 demonstration kit as options on the same PCB are:

Alternative input bridge rectification: 4 possible options including standard diode bridges, discrete schottky diode bridges, half active bridges and full active bridges; schottky diode bridges are mounted on this eval board.

Optional 4 pairs detection circuit, to detect if power is provided on 2 pairs or on 4 pairs by a high power PSE source; this circuit is not used on this eval board.

Optional booster circuit, to increase the max. input current over 1A; this circuit is not used on this eval board.

Diode or synchronous rectification; 4 package options for the diode and 2 package options for the MOSFET;

Primary side snubber; 3 options included an active clamp; a simple R-C snubber is used on this eval board.

Power transformer; 3 size options for transformer gate driven solutions and 2 size options for self-driven applications.

The bill of material (BOM) in Table 3, provides the list of components to be mounted to obtain a flyback CCM converter with gate transformer driven synchronous rectifier, with 3.3 V output at a 6 A evaluation board.

Schematic and BOM for 3.3 V at 6 A AN4687

6/31 DocID027783 Rev 1

2 Schematic and BOM for 3.3 V at 6 A

2.1 Schematic

Figure 2. STEVAL-TSP009V2 circuit schematic (1 of 2)

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GSPG17042015DI1215

DocID027783 Rev 1 7/31

AN4687 Schematic and BOM for 3.3 V at 6 A

31

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GSPG20042015DI1120


8/31 DocID027783 Rev 1

2.2 Bill of material

Table 3. STEVAL-TSP009V2 evaluation board BOM

Item Ref. Description Value PCB footprint Supplier Voltage

1 C5 Ceramic Capacitor 10 nF - 10% C0603 TDK 100 V




5 C9 Ceramic Capacitor 2.2 nF C1812 AVX 2 kV

6 C12 Ceramic Capacitor 2.2 nF C1812 AVX 2 kV



9 C18 Ceramic Capacitor 0.1 µF - 10% C0805 TDK 100 V

10 C19 Ceramic Capacitor 10 nF C0603 Several 50 V


12 C22 Ceramic Capacitor TBD C1812 AVX 2 kV

13 C23 Ceramic Capacitor 470 nF - 10% C0603 Several 50 V

14 C26 Aluminium Capacitor 33 µF - 20% C-POL8-10Panasonic

EEEFK2A330P100 V

15 C27 Ceramic Capacitor 22 µF C1206Murata -

GRM31CR61C226ME15L

16 V

16 C28 Ceramic Capacitor 2.2 µF C1210Murata -

GRM32ER72A225KA35L

100 V

17 C29 Ceramic Capacitor 2.2 µF C1210Murata -

GRM32ER72A225KA35L

100 V

18 C30 Ceramic Capacitor 150 pF C0805 TDK 100 V

19 C31 Ceramic Capacitor 1.5 nF C0805 Several 50 V


GRM31CR61C226ME15L

16 V

21 C34 Aluminium Capacitor 330 µF C-POL8-10Panasonic

EEEFK1C331P16 V


GRM31CR61C226ME15L

16 V

23 C36 Ceramic Capacitor 0.1 µF C0603 Several 50 V

24 C37 Ceramic capacitor 22 µF C1206Murata -

GRM31CR61C226ME15L

16 V

DocID027783 Rev 1 9/31


31

25 C38 Ceramic capacitor 10 nF C0603 Several 50 V

26 C39 Ceramic capacitor 1 µF C0603 KEMET 25 V



29 C44 Ceramic capacitor 0.1 µF C0603 Several 50 V

30 C45 Ceramic capacitor 0.1 µF C0603 Several 50 V


32 C49 Ceramic capacitor 3.3 nF C0603 Several 50V



35 C54 Ceramic capacitor 470 p C0603 Several 50 V

36 C55 Ceramic capacitor 100 pF C0603 Several 50 V



39 C60 Ceramic capacitor 1 nF C0805 TDK 100 V

40 C61 Ceramic capacitor 2.2 nF C1812 AVX 2 kV

41 C64 Ceramic capacitor 2.2 µF C1210Murata -

GRM32ER72A225KA35L

100 V


GRM31CR61C226ME15L

16 V


GRM31CR61C226ME15L

16 V


45 D1 Diode STTH302S SMC STM

46 D4 Schottky diode STPS2H100A SMA STM




50 D11 TVS diode SMAJ58A SMA STM





55 D20 Diode LED Aux det KA-3528SGT Kingbright

Table 3. STEVAL-TSP009V2 evaluation board BOM (continued)



10/31 DocID027783 Rev 1

56 D21 Diode STTH302S SMC STM

57 D26 Diode LED Out det KA-3528SGT Kingbright

58 D28 Schottky Diode BAT46J SOD323 STM

59 D32 Zener diode MM3Z15VT1 SOD323 Onsemi

60 D34 Schottky diode BAT46J SOD323 STM




64 D44 Diode LED T2P det KA-3528SGT Kingbright



67 JM1 Connector Jumper-doppio 3PIN-P254 Several

68 JM2 Connector Jumper-doppio 3PIN-P254 Several

69 J1 Connector SAP-JACK-RAPC722

Several

70 J2 Connector SPP-JACK-RAPC722

Several

71 J3 ConnectorData & power

inputRJ45-8PIN Molex

72 J4 Connector Data output RJ45-8PIN Molex

73 J5 ConnectorMOR-10X10.5-

P5-2PINMOR-2POLI-508 Several

74 L5 Inductor 10 µHMSS7341-

103MLCoilcraft

75 L6 Inductor 0.33 µH DO1813H Coilcraft

76 Q12 MOSFET STL66N3LLH5PowerFLAT™

5x6STM

77 Q16 MOSFET MMBT3906LT1 SOT23 Several

78 Q17 MOSFET Si4848DY so8pwrpak-SO8 VISHAY

79 Q18 MOSFET MMBT3904LT1 SOT23 Several

80 R1 Resistor 75 R R0603 Several




84 R9 Resistor 1K - 1% R0603 Several





DocID027783 Rev 1 11/31


31



89 R17 Resistor 0R0 R0805 Several




93 R27 Resistor 27 K R0603 Several



96 R38 Resistor 1 k R0603 Several


98 R44 Resistor 1 k R0603 Several

99 R45 Resistor 24.9 k R0603 Several











110 R70 Resistor 10 K-1% R0603 Several





115 R89 Resistor 4.3 K R0603 Several






121 R95 Resistor 24.9 K-1% R0603 Several




12/31 DocID027783 Rev 1







128 R108 Resistor 0.30 Ω - 1% R1206 Bourns

129 R109 Resistor 0.30 Ω - 1% R1206 Bourns


131 R112 Resistor NM R0603 Several

132 R117 Resistor 3.3 K R0603 Several

133 R119 Resistor 1K R0603 Several



136 R131 Resistor 30R9 -1% R0805 Several

137 TP2 Test point Red TH-5013 Keystone

138 TP3 Test point Black TH-5013 Keystone






















DocID027783 Rev 1 13/31


31


159 T1 Data transfo ETH1-460 ETH1-460 Coilcraft

160 T5 Power transfoCOILCRAFT JA4173 - AL

PA2328NL Coilcraft

161 T8 Power transfoCOILCRAFT DA2319-AL

DA2318-AL Coilcraft

162 U1 Controller IC PM8803HTSSOP20-

LARGESTM

163 U2 OptocouplerFairchild

FOD817ASFOD817 Fairchild



165 U4 Voltage reference TS431AILT SOT23-5L STM





Measurements results AN4687

14/31 DocID027783 Rev 1

3 Measurements results

3.1 Efficiency comparison with three rectification bridge options

STEVAL-TSP009V2 provides different rectification bridge options: single Schottky diode, half active bridge, full active bridge and diode bridge. They are alternatively usable thanks the options available on the STEVAL-TSP009V2 demo’s PCB. Efficiency measurements have been executed to compare the different characteristics cost/efficiency through three different rectification bridge options. Here below the schematics:

Figure 4. Schematic Schottky bridge

R37

0R01206

R3215K0805

D13STPS2H100ASMA

R26

0R01206

D8STPS2H100ASMA

TP2Red

C15NM0805

TP3BLACK

D12STPS2H100ASMA

D14STPS2H100ASMA

D17STPS2H100ASMA

D9STPS2H100ASMA

D4STPS2H100ASMA

D1

STTH302SSMC

J2

SP

123

D7STPS2H100ASMA

T1 pin.4 T1 pin.10T1 pin.1 T1 pin.7SP

POE+F

VSS

AUX 1

GSPG22042015DI1500

DocID027783 Rev 1 15/31

AN4687 Measurements results

31

Figure 5. Schematic full active bridge

Figure 6. Schematic half active bridge

C77NM

R291M

0603

Q4P-Ch. 100V

SO8

4

51

6 7 8

2 3

R37

0R01206

R20200K

0603

C75NM

R19200K0603

D3

MM3Z15VT1SOD323

R34

1M0603

R281M

0603R311M

0603

R26

0R01206

R3215K0805

Q7N-Ch. 100V

SO8

4

51 2 3

6 7 8

R40200K

0603

R25200K0603

R39200K0603

C79NM

D6MM3Z15VT1SOD323

R301M

0603

R361M

0603

D2MM3Z15VT1SOD323

Q1P-Ch. 100V

SO8

4

51

6 7 8

2 3

C73NM

D15MM3Z15VT1SOD323

C15

NM0805

R42200K0603

C78NM

D18MM3Z15VT1SOD323

D19MM3Z15VT1SOD323

D5MM3Z15VT1SOD323

C72NM

Q5N-Ch. 100V

SO8

4

51 2 3

6 7 8

TP3BLACK

Q6N-Ch. 100V

SO8

4

51 2 3

6 7 8

D16MM3Z15VT1SOD323

R41200K0603

R351M0603

R331M

0603

C76NM

C74NM

TP2Red

D1

STTH302SSMC

Q2P-Ch. 100V

SO8

4

51

6 7 8

2 3

J2

SP

123

Q3P-Ch. 100V

SO8

4

51

6 7 8

2 3

R22200K0603

Q8N-Ch. 100V

SO8

4

51 2 3

6 7 8

SP

T1 pin.4 T1 pin.10

T1 pin.1 T1 pin.7

POE+F

VSS

AUX 1

GSPG22042015DI1505

R26

0R01206

R331M

0603

C76NM

D7STPS2H100ASMA

C15NM0805

R40200K0603

R42200K0603

C78NM

TP2Red

R39200K0603

Q6N-Ch. 100V

SO8

4

51 2 3

6 7 8 Q8N-Ch. 100V

SO84

51 2 3

6 7 8

R41200K0603

J2

SP

123

R341M

0603

R361M

0603

D1

STTH302SSMC

D16MM3Z15VT1SOD323

D18MM3Z15VT1SOD323

Q5N-Ch. 100V

SO8

4

51 2 3

6 7 8

C79NM

D8STPS2H100ASMA

D15MM3Z15VT1SOD323

R37

0R01206

C77NM

D4

STPS2H100ASMA

TP3BLACK

R3215K0805

R351M

0603

D19MM3Z15VT1SOD323

D9STPS2H100ASMA

Q7N-Ch. 100V

SO8

4

51 2 3

6 7 8

SP

T1 pin.4 T1 pin.10T1 pin.1 T1 pin.7

VSS

POE+F

AUX 1

GSPG22042015DI1510


16/31 DocID027783 Rev 1

The measurement has been executed providing a 48 V on the RJ45 connector and connecting the Poe+/Vss (TP22 vs TP23) with external electronic load with different current values to cover around 40 W of input power.

Figure 7. Comparison efficiency bridge

Figure 7 shows the input stage efficiency comparison with three different bridge rectification type. The green line shows the efficiency of the Schottky diode bridge option, the cheaper of them, populated with four Schottky diodes STPS2H100A of each bridge. The yellow line shows the efficiency of the full active bridge, the most efficient, using two 100 V - 240 mΩ, P-channel MOSFET on high side and two 100 V - 65 mΩ N-channel MOSFET on low side of each bridge. The red line shows the half active bridge solution, which represent a right compromise in term of cost vs. efficiency.

Changing the input bridge it is possible to gain up to 2% about on the overall converter efficiency.

96.0%

96.5%

97.0%

97.5%

98.0%

98.5%

99.0%

99.5%

100.0%0

100

200

300

400

500

600

700

800

Efficiency [%]

Input Current [mA]

Efficiency Data Transfo + Bridge

Schottky Diode Bridge

Full Active Bridge

Half Active Bridge

DocID027783 Rev 1 17/31


31

3.2 Converter efficiency

Figure 8. Overall and DC/DC efficiency

Figure 8 shows overall and DC/DC efficiencies for the converter at 48 Vindc.

The dotted green line is the STEVAL-TSP009V2 DC-DC efficiency. The measurement has been executed supplying 48 V to the input RJ45 connector J1 and measuring the input voltage by TP22/TP23, input voltage of DC/DC converter stage. Figure 8 shows also the overall efficiency comparison measured with the same DC-DC converter stage connected to the three different rectification bridge stages previously mentioned.

Please note that:

Overall efficiency includes all loss from RJ45 to the output voltage rail.

DC/DC efficiency is a figure of merit of the converter standalone and typically does not include the losses associated to the PoE interface section that are: the RJ45 connector, data transformer, bridges, power consumption of the I/F of the PM8803 device.

On the STEVAL-TSP009V2 eval board is mounted the simple Schottky diodes bridge solution (green line).

Thanks to the bridge rectification options foreseen on the pcb it is then possible to select the best compromise cost/efficiency depending on the target request.

75.0%

77.5%

80.0%

82.5%

85.0%

87.5%

90.0%

92.5%

95.0%

0.0 1.0 2.0 3.0 4.0 5.0 6.0

Efficiency

Iout [mA]

3.3 Vout Overall and DC/DC Efficiency

Overall with Schottky

Overall FAB

Overall HAB

DC-DC


18/31 DocID027783 Rev 1

Figure 9. Output voltage drift

3.3 Voltage ripple

Above measurements are referred at the output voltage ripple.

3.330

3.332

3.334

3.336

3.338

3.340

0.0 1.0 2.0 3.0 4.0 5.0 6.0

Output Voltage

Iout [mA]

3.3 Vout changhe with load

drift 3V3 at 48V

Figure 10. Ripple on 3.3 V at 0.6 A Figure 11. Ripple on 3.3 V at 6 A

DocID027783 Rev 1 19/31


31

In Figure 12 and Figure 13 a measurement of the ripple on the input voltage has been done, to give an indication of the noise at the input of the converter.

3.4 Startup

Figure 12. Ripple before and after input filter with 3.3 V at 0.6 A (measured on C26 and C28)

Figure 13. Ripple before and after input filter with 3.3V at 6A (measured on C26 and C28)

Figure 14. Startup from Microsemi 9001G injector - 3.3 V at 0.6 A

Figure 15. Startup from Microsemi 9001G injector - 3.3 V at 6 A


20/31 DocID027783 Rev 1

Figure 16. Startup from Microsemi 9501G injector - 3.3 V at 0.6 A

Figure 17. Startup from Microsemi 9501G injector - 3.3 V at 6 A

Figure 18. Detail of the output voltage at startup with no load

Figure 19. Detail of the output voltage at startup with 6 A load

DocID027783 Rev 1 21/31


31

3.5 Primary side waveforms

Figure 20. Primary steady state 0.6 A Figure 21. Primary steady state 6 A

Figure 22. Detail of primary drain at 6 A load


22/31 DocID027783 Rev 1

3.6 Secondary side waveforms

3.7 Load transients

Figure 23. Secondary steady state 0.6 A Figure 24. Secondary steady state 6 A

Figure 25. Detail of secondary drain at 6 A load

Figure 26. Secondary steady state 0.6 A Figure 27. Secondary steady state 6 A

DocID027783 Rev 1 23/31


31

3.8 PoE to auxiliary switchover

In Figure 28 is shown a smooth transition from a PoE line set to 54 V toward an auxiliary adapter at 44 V; the output voltage is maintained stable during the transition.

3.9 Gloop

Figure 28. Detail of secondary drain at 6 A load

Figure 29. Gloop 48 V at 6 A Figure 30. Gloop 48 V at no load

Gloop 48V 6AMag [B/A] (dB)

30.000

-30.000

24.000

18.000

12.000

6.000

0.000

-6.000

-12.000

-18.000

-24.000

Phase [B-A] (deg)

100.000

-100.000

80.000

60.000

40.000

20.000

0.000

-20.000

-40.000

-60.000

-80.000

1 k 10 k 100 k

1 2

01/23/14 09:46:34

M1 M2Frequency 4.68 kHz 20.30 kHzMagnitude -0.001 dB -10.094 dBPhase 67.018 deg -0.024 deg


30.000

-30.000

24.000

18.000

12.000

6.000

0.000

-6.000

-12.000

-18.000

-24.000

Phase [B-A] (deg)

100.000

-100.000

80.000

60.000

40.000

20.000

0.000

-20.000

-40.000

-60.000

-80.000

1 k 10 k 100 k

1 2

01/23/14 09:51:50



24/31 DocID027783 Rev 1

Figure 31. Gloop 40 V at 6 A Figure 32. Gloop 57 V at no load


30.000

-30.000

24.000

18.000

12.000

6.000

0.000

-6.000

-12.000

-18.000

-24.000

Phase [B-A] (deg)

100.000

-100.000

80.000

60.000

40.000

20.000

0.000

-20.000

-40.000

-60.000

-80.000

1 k 10 k 100 k

1 2

01/23/14 09:49:07



30.000

-30.000

24.000

18.000

12.000

6.000

0.000

-6.000

-12.000

-18.000

-24.000

Phase [B-A] (deg)

100.000

-100.000

80.000

60.000

40.000

20.000

0.000

-20.000

-40.000

-60.000

-80.000

1 k 10 k 100 k

1 2

01/23/14 09:53:09


DocID027783 Rev 1 25/31

AN4687 Support material

31

4 Support material

4.1 PCB layers

Figure 33. PCB top assembly

Figure 34. PCB bottom assembly

Support material AN4687

26/31 DocID027783 Rev 1

Figure 35. PCB layer 1 top

Figure 36. PCB layer 2

Figure 37. PCB layer 3

DocID027783 Rev 1 27/31

AN4687 Support material

31

Figure 38. PCB layer 4 bottom

Electrical diagram general AN4687

28/31 DocID027783 Rev 1

5 Electrical diagram general

Figure 39. Schematic 1 of 2 (general)

Q3

SO

8

4

51678

23

D1

STT

H30

2SS

MC

D25

<Des

crip

tion>

41

32

-+

Q22

2N70

02

D6

SO

D32

3

R13 75R

0603

R7

75R

0603

C5

10nF

0603

100V

D33

BAT

46J

SO

D32

3

R41

0603

C73

D5

SO

D32

3

D13

SM

AS

TPS

2H10

0A

R2

75R

0603

R31

0603

Q6

SO

8 4

5 123

678

D14

SM

AS

TPS

2H10

0A

J4

DAT

A O

UTP

UT

1 2 3 4 5 6 7 8

910

R29

0603

Q2

SO

8

4

51678

23

C74

C13

NM

0603

100V

D8

SM

AS

TPS

2H10

0A

D47

BAT

46J

SO

D32

3

R36

0603

R30

0603

U12

Sha

rp P

C3H

7 - N

M41 2

3

C6

10nF

0603

100V

Q7

SO

8

4

5 123

678

J2 SP

1 2 3

D56

MM

3Z15

VT1

SO

D32

3

Q5

SO

8

4

5 123

678

C14

1nF

0603

100V

R6

1M 0603

D11

SM

AJ5

8AS

MA

R5

75R

0603

D18

SO

D32

3

D12

SM

AS

TPS

2H10

0A

R24

1M 0603

D48

BAT

46J

SO

D32

3

T11

Puls

e P

E65

855N

L - N

M

4

3 2

1

R19

0603

R28

0603

Q1

SO

84

51678

23

R32

15K

0805

D50

4P d

et

R43

0R12

06

C79

R34

0603

R35

0603

D9

SM

AS

TPS

2H10

0A

C77

C72

D3

SO

D32

3

D15

SO

D32

3

D4

SM

AS

TPS

2H10

0A

D19

SO

D32

3D49

BAT

46J

SO

D32

3

U6

Fairc

hild

FO

D81

7AS

41 2

3

C7

10nF

0603

100V

T2

Wur

th 7

4422

6S -

NM

2

34

1

R55

1M 0603

T1

ETH

1-46

0

2322 242120196 5 47 3 128910

181716151413

1112

R20

0603

R16

NM

0805

TP22

Red

R37

0R0

1206

R10 75R

0603

C20

NM

0603

100V

Q4

SO

84

51678

23

D10 NM

SM

AR12

50R

1206

C9

2.2n

F

1812

2KV

C17

NM

0805

100V

R46 47K

D17

SM

AS

TPS

2H10

0A

R8

1M 0603

R25

0603

R10

00N

M

0603

R11 75R

0603

C15

NM

0805

C76

R15

NM

0805

C12

2.2n

F

1812

2KV

TP3

BLA

CK

C8

10nF

0603

100V

D24

<Des

crip

tion>

4

1

3

2

-+

R47

3K3

R26

0R0

1206

C21

1nF

0603

100V

R14

NM

1206

R42

0603

D29

BAT

46J

SO

D32

3

R17

0R12

06

J3

DAT

A &

PO

WE

R IN

PU

T

1 2 3 4 5 6 7 8

910

R33

0603

C75

R12 75R

0603

R40

0603

TP24

BLA

CK

C78

C16

1nF

0805

100V

D7

SM

AS

TPS

2H10

0A

D30

BAT

46J

SO

D32

3

TP23

BLA

CK

Q8

SO

8 4

5 123

678

R1

75R

0603

TP2

Red

D16

SO

D32

3

C18

0.1u

F08

0510

0V

D2

SO

D32

3

R22

0603

TP25

Red

R39

0603

SS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS V

F+EOP

F+EOP

F+EOP

Cha

ssis

Cha

ssis

Cha

ssis

Cha

ssis

Cha

ssis

Cha

ssis

RTN

RTN

PO

E+F

VS

S

Vout

SP

PO

E+F

VS

S

Inpu

t Com

mon

Mod

e Fi

lter

Opt

iona

l 4

pairs

det

ectio

n ci

rcui

t

AUX

1

Auxi

liary

inpu

t fro

ntal

or A

UX

I

4 pa

irs d

etec

tion

sign

al

DocID027783 Rev 1 29/31

AN4687 Electrical diagram general

31

Figure 40. Schematic 2 of 2 (general)

Q19

MM

BT39

04LT

1SO

T23

TP9

Red

C42

NM

16V

0603

TP11

BLAC

K

R96

0R

Q25

TSSO

P6

3

561

4

2

D46

STPS

8L30

DEE

Pow

erFL

AT 3

x3

D22

STPS

15L4

5CB

DPA

K

A1 K

A2

R117

5.1K

R130

100K

R127

1M

C62

NM

0805

100V

R60

0R

R112

15K

1%

T5

Coilc

raft

HA

3691

-AL

4 516 9

2

7 10

C28

2.2u

1210

100V

D42

NM

SMA

T8CO

ILCR

AFT

DA

2319

-AL

4 631

L70.

33uH

DO

3316

P-10

3ML

12

R56

NM

D52 BA

T46J

SOD

323

C26

33uF

100V

10x1

0.2

R70

21K

1%

C49

10nF

D32

MM

3Z15

VT1

SOD

323

U11

Shar

p PC

3H7

41 2

3

U5

TS24

31A

ILT

SOT2

3

1 3

2

R84 0R

C61

2.2n

1812

2KV

U3

Fairc

hild

FO

D81

7AS

41 2

3

D20

Aux

det

R62

10R

U10

Shar

p PC

3H7

41 2

3

TP5

Red

D28

BAT4

6J

SOD

323

R107

10k

R122 0R

D45

STPS

15L3

0CD

JFPo

wer

FLAT

5x6

A1 K

A2

Q9

MM

BT39

06LT

1 N

MSO

T23

C39

1uF

16V

0603

R108

0.30

ohm

1206

TP13

Red

R92

22R

R080

5

R48

0R

R080

5

R93

1K

R51

15K

0805

R58

27K

R44

1K

R91

10

R67

NM 1%

R89

3.3K

C69

10nF

C45

0.1u

F

T4

PA01

84-P

ulse

1 854

TP20

Red

D23

NM

SMA

C43

NM

4x6

25V

R23

220

1206

C60

1nF 08

05100V

Q18

MM

BT39

04LT

1SO

T23

C71

470p

F50

V

Q11

TBD

SOT2

31

3 2

T9

COIL

CRA

FT G

A32

78-B

L

4 125

711 81210 93 6

TP15

Red

C32

NM

0805

TP12

BLAC

K

R100 NM

C68

10uF

1206

16V

R21 22

012

06

TP4

Red

T7

COIL

CRA

FT P

OE1

3P

4 123

987 10

D39

BAT4

6J

SOD

323

TP8

BLAC

K

C38

10nF

R80

10R

R73

NM

132

R53

10R

0805

C47

NM

R52

1K

D55

MM

3Z15

VT1

SOD

323

Q17

Si48

48D

YSO

84

5 123

678

J5

11

22

C41

1uF

16V

0603

R129

100K

R109

0.30

ohm

1206

D21

STTH

302S

SMC

C24

NM

0805

L510

uH

MSS

7341

-103

ML

12

D44

T2P

det

C37

10uF

1206

16V

R49

0R 1206

R38

1k

R997 N

M 1% R998 N

M 1%

C59

1uF

16V

0603

C63

2.2u

1210

100V

TP10

Red

T6

COIL

CRA

FT P

OE3

00F-

50L

4 12 5

711 812 10 9

3 6

R45

33K

R27

27k

Q16

MM

BT39

06LT

1SO

T23

C22

TBD

1812

2KV

R99

47K

R54

0R 1206

C40

NM

16V

0805

D38 BA

T46J

SOD

323

JM2

Jum

per-

dopp

io

1

2

3

R9 1K 1

%r0

603

D40

BAT4

6JSO

D32

3

R59

0R 1206

R102

NM

0805

1%

C55

100p

F

R131

30R9

1%

r080

5

R101

24.9

K1%

C19

NM

R57

NM

L60.

33uH

DO

1813

-331

ML

12

TP16

Red

C51

47nF

1206

200V

C44

0.1u

F

Q10 TB

DD

Pack

13

3

2

2

JM1

Jum

per-

dopp

io

1

2

3

Q14

MM

BT39

04LT

1SO

T23

C25

NM

R98

0R

U7

Fairc

hild

FO

D81

7AS 4

1 23

TP21

Red

C64

2.2u

1210

100V

C54

470p

R119

1K

R90

680R

D41

BAT4

6J

SOD

323

TP14

Red

U1

PM88

03H

TSSO

P20-

LARG

E

VDD

12

DET

13

SP14

CLS

15

GAT

15

RTN

4

CS3

ART

N8

DCC

L16

SA17

DT

18

T2P

20

RTN

9

GAT

27

VC6

Ex Pad21

VSS

10

VB2

CTL

1

FRS

19

VDD

11

C48

1uF

16V

0603

TP19

BLAC

K

D31

BAT4

6J

NM

SOD

323

U9

Shar

p PC

3H7

41 2

3

R111

12.4

k1%

R83

10K

C31

1nF

0805

D57

BAT4

6JSO

D32

3

C67

10uF

1206

16V

D51 BA

T46J

SOD

323

Q21

IRF6

216P

bFSO

8

4

5 123

678

R999

NM

1%

U4

TS43

1AIL

TSO

T23-

5

3 5

4 12

D26

Out det

R97 NM

TP7

Red

R94

21k

1%

C53

1uF

C30

100p

F08

0510

0V

D36

BAT4

6JSO

D32

3

D54

BAT4

6JSO

D32

3

C29

2.2u

1210

100V

R106

10K

T10

COIL

CRA

FT F

A27

06-B

L

NM

4 125

711 81210 93 6

Q12

STL6

6N3L

LH5

Pow

er F

lat 5

x6

4

5123

678

J1 SA

1 2 3

R65

1K

R95

24.9

K1%

C57

0.1u

F

R128

NM

D34 BA

T46J

SOD

323

C27

10uF

1206

16V

C35

10uF

1206

16V

R71

NM

TP6

Red

C50

0.1u

F

R66

10R

R18

NM

1206

C70

1 nF 50

V06

03

C34

330u

F

8x10

.26.

3V

C66

NM

C56

47nF

C46

NM

Q15

MM

BT39

04LT

1 N

MSO

T23

C36

0.1u

D35

BAT4

6J N

MSO

D32

3

D43

STPS

2L30

UF

SMB

Q20

Si23

25D

SSO

T23

1

3 2

Q13 TB

DSO

T223

13

3

2

2

R72

100k

1%

Q24 STS4

NF1

00SO

8

4

51

6 7 8

2 3

U2

Fairc

hild

FO

D81

7AS 4

1 23

R104

4.7K

1%

TP17

Red

R64 0R

C23

470n

F 1

0% 50V

0603

C33

10uF

1206

16V

Q23

MM

BTA

92SO

T23

TP18 Re

d

R103

510R

D53

BAT4

6JSO

D32

3

R126

100K

D37

BAT4

6JSO

D32

3

RTN

ART

N

ART

N

RTN

ART

N

RTN

RTN

RTN

RTN

ART

N

RTN

VSS

POE+

F SP

SA

T2P

SP

VAU

X

VAU

X

SA

VC T2P

P_dr

ain

P_so

urce

P_ga

te

P_dr

ain

P_so

urce

P_ga

te

VC

Ano

deKa

thod

e

Kath

ode

Ano

de

Vaux

P

RTN

Vin

Vin

P_dr

ain

Vaux

P

RTN

Kath

ode

Vo

Vgat

e

Vgat

e

SA

VSS

Vo

VSS

POE+

F

Vout

Pow

er c

ircui

t

Out

put F

ilter Fe

edba

ck c

ircui

t

48V

AU

X 2

Inpu

t Filt

er

Boos

ter

NO

TE fo

r Res

isto

rs W

here

not

indi

cate

d th

e bo

dy is

060

3 an

d to

lera

nce

5% N

OTE

for C

apac

itors

Whe

re n

ot in

dica

ted

the

body

is 0

603

and

the

volta

ge is

50V

NO

TE

The

ART

N is

a d

edic

ated

pla

ne o

f sig

nal g

roun

d th

at w

ill b

e co

nnec

ted

to th

e RT

N p

ower

gro

und

plan

e cl

ose

to p

in 4

and

9 o

f PM

8803

Opt

ion

Activ

e Cl

amp

Prev

eder

e fo

otpr

int 1

206,

0805

pe

r C40

I fo

otpr

int d

evon

o es

sser

e il

piu'

pos

sibi

le s

ovra

ppos

ti,

al fi

ne d

i min

imiz

zare

lo

spaz

io u

sato

.

Opt

o :u

n fo

otpr

int n

ell'a

ltro

SOT2

3-6L

Alte

rnat

ive

mos

fet

pack

ages

Alte

rnat

ive

diod

e pa

ckag

es

NO

TE fo

r Jum

pers

JM1

and

JM2

Mov

e th

e sh

ort o

n bo

th ju

mpe

rs a

t the

sam

e tim

e: - s

hort

bet

wee

n pi

n 1

and

3 w

hen

used

AU

X2 in

put

- sho

rt b

etw

een

pin

2 an

d 3

whe

n us

ed A

UX1

inpu

t.

For P

M88

03C

only

Prev

eder

e fo

otpr

int 1

206

e 12

10 p

er C

51

NM

NM

Auxi

liary

pre

sent

T2P

pres

ent

Opt

ion

Boos

ter

Opt

ion

Sel

f Driv

en 2

alte

rnat

ive

pow

er tr

ansf

orm

er

NM

NM

Revision history AN4687

30/31 DocID027783 Rev 1

6 Revision history

Table 4. Document revision history

Date Revision Changes

25-May-2015 1 Initial release.

DocID027783 Rev 1 31/31

AN4687

31

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