April 2015
DocID027732 Rev 1
1/7
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STEVAL-TSP009V2
PoE 3.3 V - 6 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: 3.35 VDC ± 5%
Output current: 6 A
Peak-to-peak output ripple: < 25 mV
Efficiency DC-DC full-load: > 90%
Overall peak efficiency: > 87%
Transient response ΔVOUTPK-PK to 50% load
step: < 250 mV
ΔV in load line case: < 0.5%
RoHs compliant
Description
The STEVAL-TSP009V2 is a reference design
for a PoE+, high-efficiency, 3.3 V - 6 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-TSP009V2 reference design is
based on an isolated flyback topology CCM
converter featuring synchronous rectification with
gate driver transformer.
Schematic diagrams
2/7
DocID027732 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-TSP009V2 circuit schematic (1 of 2)
STEVAL-TSP009V2
Schematic diagrams
DocID027732 Rev 1
3/7
Figure 2: STEVAL-TSP009V2 circuit schematic (2 of 2)
Powercircuit
Ou tput Filter
Feedback circuit
48V AUX2
Input Filter
NOTE for Resistors
Where not indicated the body is 0603 and tolerance 5%
NOTE for Capacitors
Where not indicated the body is 0603 and the voltage is 50V
NOTE
The ARTN is a dedicated plane of signal ground that will be connected
to the RTN power ground plane close to pin 4 and 9 of PM8803
NOTE for Jumpers JM1 and JM2
Move the short on both jumpers at the same time:
- short between pin 1 and 2 when used AUX2 input
- short between pin 2 and 3 when used AUX1 input.
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
R23
100R
1206
D32
MM3Z15VT1
SOD323
R90
750R R94
21K-1%
1%
TP5
Red
C53
1uF
C44 0.1uF
Q17
Si4848DY
SO8
4
5
1
2
36
7
8
TP4
Red
R93
510R
R51
15K
0805
D57
BAT46J
SOD323
JM1
Jumper-doppio
1
2
3
C60
1nF
0805
100V
R58
27K
C36
0.1u
D34
BAT46J
SOD323
C27
22uF
1206
16V
C30
150pF
0805
100V
R44
1K
C35
22uF
1206
16V
D39
BAT46J
SOD323
Q18
MMBT3904LT1
SOT23
TP6
Red
C59
1uF
25V
0603
C67
22uF
1206
16V
TP9
Red
D28
BAT46J
SOD323
C28
2.2u
1210
100V
R91
10R
J5
1
1
2
2
C50
100nF
R107
10K
R66
10R
TP8
BLACK
R84
0R0
C33
22uF
1206
16V
D36
BAT46J
SOD323
TP10
Red
TP14
Red
R122
0R0
C55
100pF
R72
120K-1%
1%
R131
30R9 1% R0805
C61 2.2n
1812
2KV
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
TP11
BLACK
C41
1uF
25V
0603
U3
Fairchild FOD817AS
4 1
23
D20
Aux det
C29
2.2u
1210
100V
R101
24.9K-1%
1%
TP15
Red
R62
10R
C48
1uF
25V
0603
R45 24.9K
C19
10nF
TP19
BLACK
R96
0R0
C34
330uF
8x10.2
16V
T8
COILCRAFT DA2319-AL
4
6 3
1
TP18
Red
R89
4.3K
C69
10nF
C5647nF
U4
TS431AILT
SOT23-5
3
5
4
12
U7
Fairchild FOD817AS
41
2 3
R109
0.30 ohm - 1%
1206
C39
1uF
25V
0603
R103
510R
TP12
BLACK
D21
STTH302S
SMC
Q12
PowerFLAT™ 5x6
STL66N3LLH5
4
5 1
2
3
6
7
8
TP21
Red
R27
27K
R117 3.3K
C38
10nF
C64
2.2u
1210
100V
J1
SA
1
2
3
D26
Out det
L5 10uH
MSS7341-103ML
12
C45
0.1uF
R108
0.30 ohm - 1%
1206
U2
Fairchild FOD817AS
41
2 3
R111
12.4K-1%
1%
R83
10K
D44
T2P det
R104 4.7K-1%
1%
R80
27R
C37
22uF
1206
16V
TP20
Red
Q16
MMBT3906LT1
SOT23
D52
BAT46J
SOD323
R65
1K
R49
0R0
1206
R53
1R0
0805
R38
1k
C68
22uF
1206
16V
C26
33uF - 20%
100V
10x10.2
R70
10K-1%
1%
TP13
Red
C22 TBD
1812
2KV
R64
0R0
C54
470p
C49
3.3nF
R21
220R
1206
R95
24.9K-1 % 1%
R119
1K
R99
47K
T5
COILCRAFT JA4173 - AL
4
5
1 6
92
7
10
R54
0R0
1206
C40
1uF
25V
0805
C23
470nF 10%
50V
0603
R92
10R
R0805
L6 0.33uH
DO1813-331ML
1 2
TP16
Red
R52
1K
TP7
Red
C31
1.5nF
0805
R112
NM
1%
JM2
Jumper-doppio
1
2
3
R9
1K 1%
R0603
D40
BAT46J
SOD323
Detailed description
4/7
DocID027732 Rev 1
2 Detailed description
The PM8803 evaluation board, STEVAL-TSP009V2, 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, 3.3 V output voltage with 6 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-TSP009V2
Efficiency
DocID027732 Rev 1
5/7
3 Efficiency
Figure 3: Efficiency
Revision history
6/7
DocID027732 Rev 1
4 Revision history
Table 1: Document revision history
Date
Version
Changes
24-Apr-2015
1
Initial release.
STEVAL-TSP009V2
DocID027732 Rev 1
7/7
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