NCP1081SPCGEVB
Compact, high efficiency,
30W Reference platform
with the NCP1081
Evaluation Board
User's Manual
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EVAL BOARD USER’S MANUAL
Board Details
The NCP1081SPCGEVB implements a PoE power
splitter that converts the voltage on the Ethernet cable to a
lower voltage. The board is equipped with 2 RJ45
connectors, one connector serves as the data and power input
and the other connector is the data output. Ethernet data is
untouched by the board and simply forwarded.
Figure 1. Front Side of EVB
Warnings
Close to the switching MOSFET voltages on the board
may exceed 200 V (@250 kHz). Temperature of board and
its components may exceed 85°C during normal operation.
The Evaluation board was designed to operate correctly
under these conditions.
The input voltage should never exceed 57 V nor should
the evaluation board be loaded with loads higher than the
specified 30 W. Exceeding the specified input and output
values could permanently damage the board.
Figure 2. Back Side of EVB
Table 1. EVALUATION BOARD SPECIFICATIONS
Characteristic
Min
Typ
Max
Unit
Input Voltage, PoE Input
36
−
57
V
Output Voltage
−
12
−
V
Output Current
−
−
2.5
A
Oscillator Frequency
−
250
−
kHz
Output Ripple
−
−
170
mV
Efficiency
−
−
88
%
© Semiconductor Components Industries, LLC, 2011
December, 2011 − Rev. 0
1
Publication Order Number:
EVBUM2028/D
NCP1081SPCGEVB
Table 2. BOARD CONNECTOR DESCRIPTION
Connector
Pin
J4
1
TX+/BI_DA+, Data and Power Input, Pair 1, Mode A
2
TX−/BI_DA−, Data and Power Input, Pair 1, Mode A
3
RX+/BI_DB+, Data and Power Input, Pair 2, Mode A
4
NC/BI_DC+, Data and Power Input, Pair 1, Mode B
5
NC/BI_DC+, Data and Power Input, Pair 1, Mode B
6
RX−/BI_DB−, Data and Power Input, Pair 2, Mode A
7
NC/BI_DD+, Data and Power Input, Pair 2, Mode B
8
NC/BI_DD−, Data and Power Input, Pair 2, Mode B
1
TX+/BI_DA+, Data Output
2
TX−/BI_DA−, Data Output
3
RX+/BI_DB+, Data Output
4
NC/BI_DC+, Data Output
5
NC/BI_DC+, Data Output
6
RX−/BI_DB−, Data Output
7
NC/BI_DD+, Data Output
8
NC/BI_DD−, Data Output
J1
JOUT
Description
12V
12 V Regulated Output
GND
GND Regulated Output
3
12 V Regulated Output
Figure 3. Layout (Top)
Figure 4. Layout (Bottom)
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NCP1081SPCGEVB
Figure 5. All Layers and Dimensiones
Figure 6. Schematic
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NCP1081SPCGEVB
Table 3. BILL OF MATERIALS
Designator
Qua
ntity
Description
Value
U1
1
Power over
Ethernet
controller
NCP1081
C1,
C2,
C3,
C4,
Cf1
5
Capacitor
SMD
100n/50V
Cf
1
Capacitor
Polar
Cfb1
1
Cfb2
Tolerance
Footprint
Manufacturer
Manufacturer Part
Number
Substitution
Allowed
Lead
Free
TSSOPEP
20
ON Semiconductor
NCP1081DEG
No
Yes
10%
0805-C-S
Walsin
0805B104K500CT
Yes
Yes
10u/20V
10%
C-TANT-B
AVX
TAJB106K020R
Yes
Yes
Capacitor
SMD
39n/50V
10%
0805-C-S
AVX
08055C393KAT2A
Yes
Yes
1
Capacitor
SMD
12n/50V
10%
0805-C-S
AVX
08055C123KAT2A
Yes
Yes
Cgnd
1
Capacitor
SMD
2200p/2kV
10%
1812
Walsin
1812B222K202LT
Yes
Yes
Cline,
Cpd1,
Cpd2
3
Capacitor
SMD
100n/100V
10%
1206-C
AVX
12061C104KAT2A
Yes
Yes
Cout
1
Capacitor
Polar
68u/25V/5
5mR
10%
C-TANT-E
AVX
TPME686K025R0055
No
Yes
Cpd
1
Capacitor
Polar
100u/63V
20%
CRD10.0L
17.0RM5.0
Hitano
EXR101M63
No
Yes
Csn1
1
Capacitor
SMD
100p/200V
10%
0805-C-S
AVX
08052A101JAT2A
Yes
Yes
Csn2
1
Capacitor
SMD
470p/200V
10%
0805-C-S
AVX
08052C47KJAT2A
Yes
Yes
Css
1
Capacitor
SMD
47n/50V
10%
0805-C-S
AVX
08055C473KAT2A
Yes
Yes
Cvdd
h
1
Capacitor
SMD
2.2u/16V
(+80%)
to
(-20%)
0805-C-S
AVX
0805YC225MAT2A
Yes
Yes
Cvddl
1
Capacitor
SMD
470n/50V
10%
0805-C-S
AVX
08055C474KAZ2A
No
Yes
T3
1
PoE Plus
Transformer
SM-00112
EFD20
NUFLUX
SM-00112
No
Yes
Dbr1,
Dbr2,
Dbr3,
Dbr4,
Dbr5,
Dbr6,
6
SMD Schottky
Rectifier
MBRS110
0T3G
403A-03
ON Semiconductor
MBRS1100T3G
No
Yes
Dbw,
Dgate
2
SMD
Switching
Diode
BAS16HT
1G
SOD323
ON Semiconductor
BAS16HT1G
Yes
Yes
Dsec
1
SMD Schottky
Rectifier
12CWQ06
FNPBF
DPAK
Vishay
12CWQ06FNPBF
No
Yes
Dsn,
Dsn1
2
SMD Ultrafast
Rectifiers
MURS120
T3G
403A-03
ON Semiconductor
MURS120T3G
No
Yes
Zbr3,
Zbr4
2
SMD Zener
MMSZ16T
1G
SOD123
ON Semiconductor
MMSZ16T1G
Yes
Yes
Zline
1
SMD TVS
Zener
1SMA58A
T3G
SMA
ON Semiconductor
/ Multicomp
1SMA58AT3G /
SMAJ58A
Yes
Yes
Ztvs
1
SMD TVS
Zener
1SMB100
AT3G
403A-03
ON Semiconductor
/ Multicomp
1SMB100AT3G /
SMAJ58A
Yes
Yes
J1, J4
2
8 Position 8
Contact
(8P8C)
modular jack
communication
s connector
RJ45
95501-288
1
MOLEX
95501-2881
Yes
Yes
L1
1
Drum Core
Choke
10uH/3A
10X12
Prismatic
9404037403
No
Yes
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NCP1081SPCGEVB
Table 3. BILL OF MATERIALS
Designator
Qua
ntity
Description
Value
Led
1
LED
Q1
1
Q4
Tolerance
Footprint
Manufacturer
Manufacturer Part
Number
Substitution
Allowed
Lead
Free
KP-2012S
GC
0805-D-S
EVERLIGHT
17-21SYGC/S530-E2/T
R8
Yes
Yes
MOSFET
N-CHANNEL
Si7462DP
SOPP8
Vishay Siliconix
Si7462DP
No
Yes
1
MOSFET
N-CHANNEL
FDS3992
SO-8
Fairchild
FDS3992
No
Yes
Qgate
1
Transistor
PNP
BFT92
SOT23
Philips
BFT92
Yes
Yes
Rbias
1, Rsl
2
Resistor SMD
5.1k
5%
0805-R-S
Walsin
WR08X512JTL
Yes
Yes
Rbias
2
1
Resistor SMD
20k
1%
0805-R-S
Walsin
WR08X2002FTL
Yes
Yes
Rbr3,
Rbr4,
Rosc
3
Resistor SMD
150k
1%
0805-R-S
Walsin
WR08X1503FTL
Yes
Yes
Rbw,
Rsn2
2
Resistor SMD
75
1%
0805-R-S
Walsin
WR08X750JTL
Yes
Yes
Rclas
s
1
Resistor SMD
30.1
1%
0805-R-S
Yageo
RC0805FR-0730R1L
Yes
Yes
Rcs
1
Resistor SMD
0.1/3W
1%
2512-S
Bourns
CRA2512-FZ-R100ELF
Yes
Yes
Rdet1
1
Resistor SMD
24.9k
1%
0805-R-S
Walsin
WR08X2492FTL
Yes
Yes
Rdet2
1
Resistor SMD
845
1%
0805-R-S
Yageo
RC0805FR-07845RL
Yes
Yes
Rfb1
1
Resistor SMD
15k
1%
0805-R-S
Walsin
WR08X1502FTL
Yes
Yes
Rfb2
1
Resistor SMD
3.92k
1%
0805-R-S
Walsin
WR08X3921FTL
Yes
Yes
Rfb3
1
Resistor SMD
820
1%
0805-R-S
Yageo
RC0805FR-07820RL
Yes
Yes
Rgate
1
Resistor SMD
10
1%
0805-R-S
Walsin
WR08X10R0FTL
Yes
Yes
Rilim1
1
Resistor SMD
44.2K
1%
0805-R-S
Walsin
WR08X4422FTL
Yes
Yes
Rinru
sh
1
Resistor SMD
121k
1%
0805-R-S
Walsin
WR08X1213FTL
Yes
Yes
Rled
1
Resistor SMD
1k
5%
0805-R-S
Yageo
RC080JR-07KL
Yes
Yes
Rsn1
1
Resistor SMD
330E /1W
5%
2512-S
Walsin
WR25X331JTL
Yes
Yes
T1,
T2
2
WE-LAN
SMD-10/100
BASE T
POE+
350uH
OCL
720mA
IDC
2%
SMD
Wurth-Elektronik
749012011
No
Yes
U2
1
HIGH
ISOLATION
VOLTAGE
SSOP
PHOTOCOUP
LER
PS2801-1F3-A
SSOP4
CEL
PS2801-1
No
Yes
U3
1
Programmable
Shunt Voltage
Reference
TL432BID
BZTG4
SOT23
Texas-Instruments
TL432BIDBZTG4
No
Yes
0805-C-S
ON Semiconductor
MMSZ16T1G
Vishay
Si7113
Csi
1
Capacitor
NC
Csn
1
Capacitor
NC
1206-C
Zbr1,
Zbr2
2
SMD Zener
NC
SOD123
Rbr1,
Rbr2
2
Resistor SMD
NC
0805-R-S
Rdet1
’
1
Resistor SMD
NC
0805-R-S
Rsn
1
Resistor SMD
NC
2512-S
Q2,
Q3
2
P-Channel
30V (D-S)
MOSFET
NC
POWERP
ACK
1212-8
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