April 2015
DocID027712 Rev 1
1/7
For further information contact your local STMicroelectronics sales
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STEVAL-TSP004V2
PoE 5 V - 4 A PD converter based on the PM8803 IEEE802.3at
compliant synchronous flyback controller
Data brief
Features
IEEE 802.3at compliant PD interface
Works with power supplied from Ethernet
LAN cables or from local auxiliary sources
Line Input voltage range: 40 VDC to 60 VDC
Output voltage: 5 VDC ± 5%
Output current: 4 A
Peak-to-peak output ripple: < 30 mV
Efficiency DC-DC full-load: > 92%
Overall peak efficiency: > 89%
Transient response ΔVOUTPK-PK to 50% load
step: < 170 mV
ΔV in load line case: < 0.5%
RoHs compliant
Description
The STEVAL-TSP004V2 is a reference design
for a PoE+, high-efficiency, 5 V - 4 A flyback
converter based on the PM8803 PoE controller.
The PM8803 is a highly integrated device
embedding an IEEE802.3at-compliant powered
device (PD) interface together with a PWM
controller and support for auxiliary sources.
The STEVAL-TSP004V2 reference design is
based on an isolated flyback topology CCM
converter featuring synchronous rectification with
gate driver transformer.
Schematic diagrams
STEVAL-TSP004V2
2/7
DocID027712 Rev 1
R37
0R0 1206
R1 75R
0603
C12
2.2nF
1812
2KV
C9
2.2nF
1812
2KV
R32
15K
0805
C14
1nF 10%
0603
100V
D1
STTH302S
SMC
C16
1nF 10%
0805
100V
R2 75R
0603
C18
0.1uF 10%
0805
100V
TP22
Red
R5 75R
0603
C5
10nF 10%
0603
100V
C7
10nF 10%
0603
100V
R26
0R0 1206
D12
STPS2H100A
SMA
D7
STPS2H100A
SMA
R1250R0
1206
D14
STPS2H100A
SMA
J2
SP
1
2
3
TP24
BLACK
R17
0R01206
R11
75R
0603
R12
75R
0603
TP3
BLACK
J4
DATA OUTPUT
1
2
3
4
5
6
7
8
910
D4
STPS2H100A
SMA
R7 75R
0603
R13
75R
0603
J3
DATA & POWER INPUT
1
2
3
4
5
6
7
8
910
C8
10nF 10%
0603
100V
D8
STPS2H100A
SMA
R10
75R
0603
C21
1nF 10%
0603
100V
T1
ETH1-460
23
22
24
21
20
19
6
5
4
7
3
1
2
8
9
10
18
17
16
15
14
13
11
12
R43
0R0 1206
D11
SMAJ58A
SMA
D17
STPS2H100A
SMA
TP2
Red
TP23
BLACK
D9
STPS2H100A
SMA
D13
STPS2H100A
SMA
C6
10nF 10%
0603
100V
POE+F
VSSVSSVSSVSSVSSVSSVSSVSSVSSVSSVSSVSSVSSVSSVSSVSSVSSVSSVSSVSSVSS
Chassis
Chassis
Chassis
Chassis Chassis
Chassis
RTN
POE+F
VSS
SP
AUX 1
Auxiliary input frontal or
AUXI
GSPG17042015DI1215
1 Schematic diagrams
Figure 1: STEVAL-TSP004V2 circuit schematic (1 of 2)
STEVAL-TSP004V2
Schematic diagrams
DocID027712 Rev 1
3/7
Figure 2: STEVAL-TSP004V2 circuit schematic (2 of 2)
Powercircuit
Ou tput Filter
Feedback circuit
48V AUX2
Input Filter
Auxiliary present T2P present
VSS
POE+F
SP
SA
T2P
SP
VC
T2P
VC
SA
VSS
RTN
ARTN
ARTN
RTNARTN
RTN
RTN
RTN
RTN
ARTN
RTN
TP9
Red
TP11
BLACK
R96
0R0
R117 5.1K
R112
15K 1%
1%
C28
2.2u
1210
100V
T8
COILCRAFT DA2319-AL
4
6 3
1
D52
BAT46J
SOD323
C26
33uF 20%
100V
10x10.2
R70
10K 1%
1%
C49
3.3nF
T5
COILCRAFT HA3691-AL
4
5
1 6
92
7
10
D32
MM3Z15VT1
SOD323
R84
0R0
C61 2.2n
1812
2KV
U3
Fairchild FOD817AS
4 1
23
D20
Aux det
R62
10R
TP5
Red
D28
BAT46J
SOD323
R107
10K
R122
0R0
C39
1uF
25V
0603
R108
0.30 ohm 1%
1206
TP13
Red
R92
10R
R0805
R93
1K
R51
15K
0805
R58
27K
R44
3K3
R91
10R
R89
3.3K
C69
10nF
C45
0.1uF
TP20
Red
R23
100R
1206
C60
1nF
0805
100V
Q18
MMBT3904LT1
SOT23
TP15
Red
TP12
BLACK
C68
22uF
1206
16V
R21
220R
1206
TP4
Red
D39
BAT46J
SOD323
TP8
BLACK
C38
10nF
R80
20R
R53
5R
0805
R52
3K3
Q17
Si4848DY
SO8
4
5
1
2
36
7
8
J5
1
1
2
2
C41
1uF
25V
0603
R109
0.30 ohm 1%
1206
D21
STTH302S
SMC
L5 10uH
MSS7341-103ML
1 2
D44
T2P det
C37
22uF
1206
16V
R49
0R0
1206
R38
1k
C59
1uF
25V
0603
TP10
Red
R45 24.9K
R27
27k
Q16
MMBT3906LT1
SOT23
C22 TBD
1812
2KV
R99
47K
R54
0R0
1206
C40
1uF
25V
0805
JM2
Jumper-doppio
1
2
3
R9
1K 1%
R0603
D40
BAT46J
SOD323
C55
100pF
R131
30R9 1% R0805
R101
24.9K 1%
1%
C19
10nF
L6 0.33uH
DO1813-331ML
1 2
TP16
Red
C44 0.1uF
JM1
Jumper-doppio
1
2
3
U7
Fairchild FOD817AS
41
2 3
TP21
Red
C64
2.2u
1210
100V
C54
470p
R119
3.3K
R90
1k5
TP14
Red
U1
PM8803
HTSSOP20-LARGE
VDD
12 DET
13 SP
14 CLS
15 GAT1 5
RTN 4
CS 3
ARTN 8
DCCL
16 SA
17 DT
18
T2P
20
RTN 9
GAT2 7
VC 6
Ex Pad
21
VSS 10
VB 2
CTL 1
FRS
19
VDD
11
C48
1uF
25V
0603
TP19
BLACK
R111
12.4K 1%
1%
R83
10K
C31
1.5nF
0805
D57
BAT46J
SOD323
C67
22uF
1206
16V
U4
TS431AILT
SOT23-5
3
5
4
12
D26
Out det
TP7
Red
R94
21K 1%
1%
C53
1uF
C30
68pF
0805
100V
D36
BAT46J
SOD323
C29
2.2u
1210
100V
Q12
PowerFLAT™ 5x6
STL60N3LLH5
4
5 1
2
3
6
7
8
J1
SA
1
2
3
R65
1K
R95
24.9K 1 % 1%
D34
BAT46J
SOD323
C27
22uF
1206
16V
C35
22uF
1206
16V
TP6
Red
C50
47nF
R66
10R
C34
330uF
8x10.2
16V
C5647nF
C36
0.1u
R72
120K 1%
1%
U2
Fairchild FOD817AS
41
2 3
R104 4.7K 1%
1%
R64
0R0
C23
470nF 10%
50V
0603
C33
22uF
1206
16V
TP18
Red
R103
510R
GSPG02042015DI1005
Detailed description
STEVAL-TSP004V2
4/7
DocID027712 Rev 1
2 Detailed description
The PM8803 evaluation board, STEVAL-TSP004V2, 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. Although the PM8803 can be configured
to work in several isolated topologies (self-driven or transformer gate-driven), the focus
here is on a high-efficiency isolated flyback converter topology with synchronous
rectification, 5 V output voltage with 4 A output current capability.
Auxiliary sources can be connected to the board on 2 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 use of a wall adapter with voltage lower than the internal PoE
UVLO threshold, while still benefitting from the inherent inrush and DC current limit. The
possible configurations supported by the PM8803 evaluation board as options on the same
PCB are:
Input diode bridges; 4 possible options, including active bridges
Optional 4-pair detection circuit, to detect a high power PSE source
Optional booster circuit, to increase the max input current over 800 mA
Diode or synchronous rectification; 4 package options for diode and 3 package options
for MOSFET
Primary side snubber; 3 options including active clamp
Power transformer; 3 size options for transformer gate-driven solutions and 2 size
options for self-driven applications
STEVAL-TSP004V2
Efficiency
DocID027712 Rev 1
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3 Efficiency
Figure 3: Efficiency
Revision history
STEVAL-TSP004V2
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DocID027712 Rev 1
4 Revision history
Table 1: Document revision history
Date
Version
Changes
24-Apr-2015
1
Initial release.
STEVAL-TSP004V2
DocID027712 Rev 1
7/7
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