STEVAL-TSP004V2
PoE 5 V - 4 A PD converter based on the PM8803 IEEE802.3at
compliant synchronous flyback controller
Data brief
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.
Features
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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
April 2015
DocID027712 Rev 1
For further information contact your local STMicroelectronics sales
office
1/7
www.st.com
Chassis
1
2
3
4
5
6
7
8
GSPG17042015DI1215
DocID027712 Rev 1
1
2
3
0R0 1206
R26
0R0 1206
TP3
BLACK
R37
R32
15K
0805
TP2
Red
Auxiliary input frontal orAUXI
SP
AUX 1
J2
DATA & POWER INPUT
J3
10
9
2/7
STTH302S
SMC
D1
SP
D14
STPS2H100A
SMA
D7
STPS2H100A
SMA
C5
10nF 10%
0603
100V
R10
75R
0603
R12
75R
0603
D17
STPS2H100A
SMA
D4
STPS2H100A
SMA
Chassis
C12
2.2nF
2KV
1812
C6
C7
10nF 10% 10nF 10%
0603
0603
100V
100V
R11
75R
0603
C8
10nF 10%
0603
100V
R13
75R
0603
D12
STPS2H100A
SMA
D8
STPS2H100A
SMA
D13
STPS2H100A
SMA
D9
STPS2H100A
SMA
2
1
3
4
5
6
8
7
9
10
11
12
ETH1-460
T1
24
23
22
21
20
19
18
17
16
15
14
13
75R
75R
0603
R7 75R
0603
R5 75R
0603
R2
0603
R1
Chassis
TP23
BLACK
C16
1nF 10%
0805
100V
TP22
Red
TP24
BLACK
R1250R0
C9
2.2nF
2KV
1812 1206
R17
0R0 1206
R43
0R01206
VSS
POE+F
Chassis
J4
VSS
C21
1nF 10%
0603
100V
RTN
C14
1nF 10%
0603
100V
POE+F
DATA OUTPUT
C18
D11
0.1uF 10% SMAJ58A
0805
SMA
100V
Chassis
1
2
3
4
5
6
7
8
10
1
9
Chassis
Schematic diagrams
STEVAL-TSP004V2
Schematic diagrams
Figure 1: STEVAL-TSP004V2 circuit schematic (1 of 2)
VSS
SP
POE+F
27k
C19
10nF
R27
R38
1k
C69
10nF
R101
24.9K 1%
1%
R64
0R0
SA
J1
1
2
3
MMBT3904LT1
SOT23
Q18
R49
1206
0R0
R0805
R72
120K 1%
1%
R54
1206
0R0
C23
470nF 10%
50V
0603
R9
1K 1%
R0603
24.9K 1 % 1%
R95
30R9 1%
R131
T2P
R51
15K
0805
TP8
BLACK
TP7
Red
TP11
BLACK
11
12
13
14
15
16
17
18
19
20
R70
10K 1%
1%
HTSSOP20-LARGE
PM8803
VDD
VDD
DET
SP
CLS
DCCL
SA
DT
FRS
T2P
SA
Ex Pa d
21
D21
U1
0805
100V
C60
1nF
VSS
RTN
ARTN
GAT2
VC
GAT1
RTN
CS
VB
CTL
R65
1K
R58
27K
SMC
10
9
8
7
6
5
4
3
2
1
10nF
C38
STTH302S
TP14
Red
TP4
Red
C41
1uF
25V
0603
ARTN
C53
1uF
ARTN
SOD323
BAT46J
D52
2.2u
1210
100V
C64
L5
10uH
2
VC
C54
470p
R89
3.3K
C40
1uF
25V
0805
510R
R103
R66
10R
Inpu t Filter
C26
33uF 20%
100V
10x10.2
MSS7341-103ML
1
ARTN
SOD323
BAT46J
D57
R0805
R92
10R
RTN
RTN
D28
10R
R62
SOD323
TP15
Red
1206
RTN
RTN
Q17
SO8
VSS
SP
3
3
Si4848DY
0.1uF
C45
R108
R109
0.30 ohm 1% 0.30 ohm 1%
1206
1206
TP18
Red
4
Red
TP16
R23
100R
1206
TP19
BLACK
R21
220R
C30
68pF
0805
100V
R107
10K
0R0
R84
BAT46J
Powercircuit
D32
MM3Z15VT1
SOD323
C39
1uF
25V
0603
2.2u
1210
100V
2.2u
1210
100V
RTN
C29
C28
TP9
Red
5
6
7
8
1
2
3
48V AUX2
TBD
2KV
1812
T5
9
10
7
6
T8
JM1
Jumper-doppio
6
4
JM2
Jumper-doppio
1
1
3
1
SA
RTN
COILCRAFT DA2319-AL
COILCRAFT HA3691-AL
5
4
2
1
C22
2
DocID027712 Rev 1
2
R45
R83
10K
C44
24.9K
0.1uF
U2
D36
BAT46J
SOD323
BAT46J
SOD323
D34
8
7
6
5
0805
C31
1.5nF
2
1
3
4
Fairchild FOD817AS
R80
20R
TP10
Red
TP5
Red
Q12
R44
3K3
ARTN
RTN
C50
47nF
R90
1k5
C27
22uF
1206
16V
U3
22uF
1206
16V
C67
22uF
1206
16V
C68
C61
2
3
T2P
VC
1812
2.2n
2KV
SOD323
L6
0.33uH
2
R117
C59
1uF
25V
0603
5.1K
2
3
4
1
C56
47nF
22uF
1206
16V
C35
2
1
3
4
Fairchild FOD817AS
U7
Feedback circuit
SOT23-5
TS431AILT5
U4
SOD323
R93
1K
22uF
1206
16V
C33
BAT46J
D40
R99
47K
C49
3.3nF
Ou tpu t Fil ter
DO1813-331ML
1
BAT46J
D39
1
4
Fairchild FOD817AS
22uF
1206
16V
C37
Auxiliary present
TP21
Red
D20
Aux det
Q16
MMBT3906LT1
SOT23
TP13
Red
PowerFLAT™ 5x6
STL60N3LLH5
3
2
1
0805
R53
5R
R119
3.3K
TP20
Red
D44
T2P det
R112
15K 1%
1%
R111
12.4K 1%
1%
R94
21K 1%
1%
C36
0.1u
2
1
J5
BLACK
TP12
2
1
TP6
Red
T2P present
0R0
R122
D26
4.7K 1%
1%
R104
C55
100pF
R96
0R0
Out de t
C48
1uF
25V
0603
R91
10R
C34
330uF
16V
8x10.2
R52
3K3
STEVAL-TSP004V2
Schematic diagrams
Figure 2: STEVAL-TSP004V2 circuit schematic (2 of 2)
GSPG02042015DI1005
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4
Detailed description
2
STEVAL-TSP004V2
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:

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4/7
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
DocID027712 Rev 1
STEVAL-TSP004V2
3
Efficiency
Efficiency
Figure 3: Efficiency
DocID027712 Rev 1
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Revision history
4
STEVAL-TSP004V2
Revision history
Table 1: Document revision history
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Date
Version
24-Apr-2015
1
DocID027712 Rev 1
Changes
Initial release.
STEVAL-TSP004V2
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