Features
• Based on PM8804 and PM8805
• 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 VDC
• Output voltage: 5 VDC ± 2.5%
• Output current: 8 A
• Peak-to-peak output ripple: < 50 mV
• DC-DC full load efficiency: > 91%
• Overall full load efficiency: > 90%
• Transient response ΔV pk-pk 100% to 50% load step ≈ 700mV
• Switching frequency ≈ 280 KHz
Description
The STEVAL-POE002V1 power device evaluation board is equipped with a DC-DC
converter stage, managed by the PM8804 controller, which provides 40 W (5 V-8 A)
on the output.
The DC-DC converter stage is based on the fixed frequency Flyback topology with a
secondary synchronous rectification managed by the controller via gate driver
transformer.
The evaluation board embeds also the PM8805 controller, dedicated to the Ethernet
interface (compliant with the Standard IEEE802.3.af/at/bt) and to the full active bridge
rectification.
Product summary
Power over Ethernet-PD
converter based on
PM8804 and PM8805
STEVAL-
POE002V1
PWM peak current mode
controller for PoE and
telecom systems
PM8804
IEEE802.3bt PoE-PD
interface with integrated
dual-active bridge
PM8805
Power over Ethernet - PD converter with 5 V 8 A output, synchronous Flyback,
IEEE802.3bt standard compliant
STEVAL-POE002V1
Data brief
DB3628 - Rev 1 - October 2018
For further information contact your local STMicroelectronics sales office.
www.st.com
1STEVAL-POE002V1 schematic diagrams
Figure 1. STEVAL-POE002V1 circuit schematic (1 of 4)
100V
IN36
19
IN36
20
Orange
FAUX
1
IN45
10
T7
NM
5
2
17
Green
IN78
5
5
100V
4
3
their final value could be selected from the table
based on the output power and Type of the PD.
7
T1
21
100V
2
4
Note for Class1 and Class2 resistors:
11
744272102
100V
J2
2
VB
C9
NM
1812
2VB
4
NM
3.9K3.9K
10x10.2
R5
STBY
2KV
27
VOUT
L6
B88069X9231T203-NM
26.1K
5
4
VOB
Chassis
R10
1k
R57
17
R20
2
C1
10nF
0603
T0
PGD
R475R
L8
0603
C13
100nF
0805
C2
Ferrite bead 0805
10nF
0603
R21
NM
R375R
R58
NM
3
IN12
3
D3
SMA
2
VOB
BAV70
NM
D6
C5
2.2nF
1812
IN12
42
U20
SMC
NM
C15
33uF-NM
100V
4
100V
B88069X9231T203-NM
R14
1%
VOUT 28
23
ETH1-460
22
1
Brown
33
NC
1
U11
SMC
NM
U19
SMC
material X7R and tolerance ±10%
100 nF 100 V is X7R ±10% 0805.
0805
1%
IN78
RAUX
11
SM15T68CA
C62
1nF
0805
C7
NM
1812
26
RV2
1
3
IN78 40
VOB
ExPad EP6
ExPad
Data output
15
1
D4
T8
NM
8
GND12
U8
SMC
10
C11
1 nF
0603
Ferrite bead 0805
100V
1KV
R175R
C12
1 nF
0603
14
0805
2
RAUX
VB
T0
QFN56-8X8X1-49PIN
R60
NM
IN45
4
31
8T1
Blue
744272102
SM15T68CA
C4
10nF
0603
Note for resistors:
R6
75R
IN12
where not indicated the body is 0603 and tolerance ±5%
Note for capacitors:
where not indicated the body is 0603, the voltage is 100 V
Chassis
1
2
T5
1
IN12
16
VOB
2010
43
GND78
13
19
6
0805
L5
100V
12
CLS1
9T2
C18
470 pF
0603
15
6
22 GND36
VOB
Data and power input
C8
NM
1812
U17
SMC
T1
0603
3
100V
3
1
CLS1
1
D5
2
36
IN45
100V
16
Chassis
VDC
1
SM15T68CA
U18
SMC
24
21
1KV
U1
2
1KV
Ferrite bead 0805
18
0603
PM8805
9
0R0
CLS2
PGD 25
C64
1nF
0805
C14
10nF
4
2
GND
CTRL 24
0805
Chassis
14 GND12
VB
T2
1KV
9
L7
EP1
C19
100nF
0805
32
IN36 23
Ferrite bead 0805
R90R
VCP
Brown
0603
20
NM0805
RV1
38
37
100V
100V
0603
9
Blue
3
35
GND45
8
EP5
Note for surge arrester:
8
NM0805
U21
SMC
NM
R107
3.9K
VOB
C65
NM
0805
U5
SMC
75R
C10
2.2nF
1812
Chassis
12
Chassis
R22
150R
DET
41
IN78
75R
T2
100V
6
D7
EP3
SM15T68CA
C17
100nF
0805
7
Note for T0 T1 T2 signals:
they might not be used
U16
SMC
NM
Green
R8
U10
SMC
NM
T6
IN45
7
C3
10nF
0603
100V
18
ExPad
EP4 ExPad
R7
75R
C16
4.7uF
1210
4
AGND
7T0
STBY
R19
T1
foreseen on PCB footprint for
B88069X9231T203
0603
100V
R59
GND36
Chassis
29
VDD 30
U9
SMC
0603
J1
1
GND78
SM15T68CA
39
34
3
10 FAUX
2KV
U7
SMC
NM
ExPad EP2
ExPad
0603
U6
SMC
NM
6
1
13
VOB
3
2
R18
1
2
C6
NM
1812
Orange
100V
GND45
0805
1%
0805
10
R275R
R23
36R5
Figure 2. STEVAL-POE002V1 circuit schematic (2 of 4)
C86
NM
100k
0805
3
D14
2
C82
D43
C84
SOD323
STBY
BAT46J
VDC
SMC
0R-NM
D45
10nF
0R-NM
GND
SMC
SHDN
D46
BAT46J
FAUX
0805
C85
NM
SOD323
R122
47K
R115
R121
47K
0805
Raux +live PoE
J9
3
2
SOD323
R117
100k
R75
1k
D47
3k9
BAT46J
RAUX
D44
J10
BAT46J
CLS1
D37
2
R114
SOD323
R118
1
STTH302S
R67
0R-NM
BAT46J
P2
3
AUX Rear
4
STBY High
D42
AUXF
SOD323
R116
R77
FAUX
R0805
STBY
VOB
10nF
SLEEP/WKUP
SOD323
AUX Front
3
3k9
C83
D40
BAT46J
RAUX
100k
VB
STTH302S
1
R76
0R
FAUX
0805
R69
100k
R119
R123
1k
STBY
0805
D41
0805
P1
D20
AUXR
AutoClass
RAUX
2
VB
4
1
3k9
SOD323
R120
10nF
D39
1
BAT46J
STEVAL-POE002V1
STEVAL-POE002V1 schematic diagrams
DB3628 - Rev 1 page 2/5
Figure 3. STEVAL-POE002V1 circuit schematic (3 of 4)
1%
SGND
47nF
2KV
R29
10R
33nF
DT 50ns 91K
C24
4.7µF
1210
VOUT Led
C542200pF
1812
2
VSN
SOT23 SOT23
R27
3Mega
D11
100V
0805
turret
1
NC1
R33
6
Q2
SOD323
0603
C51
1nF
0805
S1
R4682k
1
680R
C46
1nF
0805
C26
NM
0805
16V
2
VSN
2
Note
Feedback loop must be fine tuned
taking into account also the
overall capacitance due to
VDC
C58
Note
6.3V
R35
STL110NS3LLH7
synch MOSFET
N ch 60 V 10 milli max Qt <30nc
PGND
V5V
G4
16QFN_3X3X0.75_0.5
C60
SGND
C31
4.7µF
1210
0805
11
GAT2
VC
J4
0603
10K
10x10.2
R44
R100
R47
R412K2
5
3
R49
0R
CS
C27
NM
TP10
R26
0R
6
10K
C39
1nF
MMBT3906LT1
D9
BAS70
C56
NM
100nF
6K8
R52
20k
1%
R62
NM
R34
20R
PGND
PGND
0805
D5
C36
100µF
1210
2
PGD
10K
1
Fsw 300khz 82K
SS 10ms
100pF
Input Filter
C29
33µF
100V
2KV
0603
1206
D7
Alternative primary MOSFET
C20NM
1812
SGND
C34
2200pF
1812
C22
2200pF
1812
C41
100µF
1210
4
G4
9
CoilCraft NA6083-BL
11
R24
0R
GAT1
10
PGND
0805
BZX84C10-NM
R53
U4
0603
R30
NM
TS431AILT
2
3
Q4
0603
0805
C5333nF
J6
Note
Note
PowerFLAT 5x6
C33
4.7µF
1210
2
Power circuit
Feedback circuit
2KV
C25
100pF
TP9
C52
2KV
2KV
C59
0805
VINpf
8
VIN
BSC500N20NS3G
R4591K
L20R
1
0805
16V
C37
100µF
1210
U3
8
C50
100nF
25V
DO3316H-121MLD
Q3
0805
VSP
D8
4
C43
330µF-NM
8x10.5
SGND
Common Mode Filter
C32
4.7µF
1210
R4810R
R51
GND
C38
100µF
1210
R55
12K
PowerFLAT 5x6
C21
2200pF
1812
C57
S1
T3
C
Q1
3.3K
1%
D8
C35
2200pF
1812
A
12
3DT
SOD323
R25
100R
0805
1
S3
100V
1206
COILCRAFT DA2319-AL
FOD817AS
PGND
16V
VINnf
1%
T4
R108
R100
5
SOD323
S2
330R
R42
9
XAL5050-562
Chassis
16V
100V
C45
NM
25V
2010
SOD323
16V
1
R31
NM
0805
C49
100nF25V
0805
7
NC2
6
PGD
2
4
1
12
10
0805
BSC039N06NS
Alternative synch MOSFET
L4120nH
R32
10R
1
R40
D13
BAS70
MMBT3904LT1-NM
D10
BAS70
C30
NM
the electronics circuits that
the converter is powering
D15
PGND
MODE
13
16V
1%
D12
BAS70
0805
SGND
100V
NC
100V
C40
100µF
1210
R50
SGND
100V
T2
NM
0603
SMA
SOT23-5
5
1
L30R
C28
NM
SOT23
PM8804
100V
1%
100V
U2
turret
C42
100µF
1210
fine tuned in the final application
R3810R
150nF
S3
D6
Note
17
Note
PM8804 parameters must be
Primary MOSFET
N ch 150-200V 50 milli max Qt <30nc
EEEFK2A330P
R43
FDMS86252
3
Ex Pad
VGS
3
R37
0R
R56
22nF
X5RX5R
0805
R3610R
C48
D7
1206
Blanking 70ns 130K
BLK
16
10k
7
1
S2
FSW
2SS
AGND
14
CTL
15
C55
2.2µF
25V
R28150R
R54
15K
1%
L1
4
0805
0805
2
Internal auxiliary voltage must be
set between 9V and 10V
from no load to full load
NM
X5RX5RX5RX5R
Note
C47
2.2µF
25V
D5
Auxiliary voltage
4
C23
1nF
0805
100pF
R61
3.3K
3
130K
1%
4
D82KV
D6
C44
100nF
1K5
Figure 4. STEVAL-POE002V1 circuit schematic (4 of 4)
1%
R110
NM
U12
V5V
SGND
C74
NM
PGND
D36
NM
U14
Note
place the optional circuit on the bottom side.
1N4148WS-NM
R106
0R
1
0805
5
SGND
1
4
2
1VCC
100R
SRK1000-NM
0R
R109 NM
TS431AILT
3
R112
2 4
VAUX
6
DVS
D35
VGS
R104
39K
1%
3
TS2431-NM
NM
3
U13
SOD323
330R
VSN
1
0603
SOT23
2
C78
SOT23-5
1%
U15
2
C76
NM
R101
R102
PGD
GND
3GD
R113
0R
C75
BAS70-NM
100p
1uF
1
FOD817AS
D38
V5V
C81
NM
47K
2
4
TON
5
R105
SOD323
R111 R103
12K
STEVAL-POE002V1
STEVAL-POE002V1 schematic diagrams
DB3628 - Rev 1 page 3/5
Revision history
Table 1. Document revision history
Date Version Changes
16-Oct-2018 1 Initial release.
STEVAL-POE002V1
DB3628 - Rev 1 page 4/5
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STEVAL-POE002V1
DB3628 - Rev 1 page 5/5
