Page 1
Semiconductor Components Industries, LLC, 2011
December, 2011 − Rev. 0
1 Publication Order Number:
EVBUM2006/D
NCP1083QBCGEVB
Compact, high efficiency,
30W Reference platform
with the NCP1083
Evaluation Board
User's Manual
Board Details
The NCP1083QBCGEVB implements a PoE module that
converts the power from the Ethernet cable to a lower
voltage. The board also supports getting its power from and
auxiliary input, in case PoE network is not available
Warnings
Close to the switching MOSFET voltages on the board
may exceed 200 V (@250 kHz). Temperature of board and
its components may exceed 85C 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 1. Front Side of EVB
Figure 2. Back Side of EVB
Table 1. EVALUATION BOARD SPECIFICATIONS
Characteristic Min Typ Max Unit
Input Voltage, PoE Input 36 − 57 V
Input Voltage, Auxiliary Input 24 − 57 V
Output Voltage − 12 − V
Output Current − − 2.5 A
Oscillator Frequency − 250 − kHz
Output Ripple − − 170 mV
Efficiency − − 88 %
http://onsemi.com
EVAL BOARD USER’S MANUAL
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Table 2. BOARD CONNECTOR DESCRIPTION
Connector Pin Description
P1 1 nClassAT, Notification Towards External Processor that IEEE802.3at, 2nd Event Classification
Has Completed
2 Not Connected
3 Vin, PoE, Pair 1
4 Vin, PoE, Pair 1
5 Vin, PoE, Pair 2
6 Vin, PoE, Pair 2
7 Vaux, Positive Auxiliary Input Supply
8 Vaux_gnd, Auxiliary Input Supply Ground
Jout 1 12 V Regulated Output
2 12 V Regulated Output
3 12 V Regulated Output
4 GND Regulated Output
5 GND Regulated Output
6 GND Regulated Output
Figure 3. Layout Front Figure 4. Layout Back
Figure 5. Silkscreen Front Figure 6. Silkscreen Back
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Figure 7. Schematic
Table 3. BILL OF MATERIALS
Desig-
nator
Qua
ntity
Description Value Toler-
ance
Footprint Manufacturer Manufacturer Part
Number
Substitution
Allowed
Lead
Free
U1 1 Power over
Ethernet
controller
NCP1083 TSSOPEP20ON Semiconductor NCP1083DEG No Yes
Cf1 1 Capacitor
SMD
0.1u/50V 10% 0805-C-S Walsin 0805B104K500CT Yes Ye s
Cline,
Cpd1
2 Capacitor
SMD
100n/100V 10% 1206-C AVX 12061C104KAT2A Yes Ye s
Csn1 1 Capacitor
SMD
100p/200V 10% 0805-C-S AVX 08052A101JAT2A Yes Yes
Cfb2 1 Capacitor
SMD
12n/50V 10% 0805-C-S AV X 08055C123KAT2A Yes Yes
Cvddh1 Capacitor
SMD
2.2u/16V (+80%)
to
(-20%)
0805-C-S AVX 0805YC225MAT2A Yes Yes
Cgnd 1 Capacitor
SMD
2200p/2kV 10% 1812 Walsin 1812B222K202LT Ye s Yes
Cfb1 1 Capacitor
SMD
39n/50V 10% 0805-C-S AV X 08055C393KAT2A Yes Ye s
Cvddl 1 Capacitor
SMD
470n/50V 10% 0805-C-S AVX 08055C474KAZ2A No Ye s
Csn2 1 Capacitor
SMD
470p/200V 10% 0805-C-S AVX 08052C47KJAT2A Ye s Ye s
Css 1 Capacitor
SMD
47n/50V 10% 0805-C-S AV X 08055C473KAT2A Yes Ye s
Cpd 1 Electrolytic
Capacitor
100u/63V 20% CRD10.0L
17.0RM5.0
Hitano EXR101M63 No Yes
Cf 1 Capacitor
Polar
10u/20V 10% C-TANT-B AV X TAJB106K020R Yes Ye s
Cout 1 Capacitor
Polar
68u/25V/5
5mR
10% C-TANT-E AVX TPME686K025R0055 No Ye s
T3 1 PoE Plus
Transformer
SM-00112 EFD20 NUFLUX SM-00112 No Yes
Daux11 SMD Schottky
Rectifier
MBRS2H1
00T3G
403A-03 ON Semiconductor MBRS2H100T3G No Ye s
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Table 3. BILL OF MATERIALS
Desig-
nator
Lead
Free
Substitution
Allowed
Manufacturer Part
Number
ManufacturerFootprintToler-
ance
ValueDescriptionQua
ntity
Dsn,
Dsn1
2 SMD Ultrafast
Rectifiers
MURS120
T3G
403A-03 ON Semiconductor MURS120T3G No Ye s
Dbr1,
Dbr2,
Dbr3,
Dbr4 ,
Dbr5,
Dbr6,
6 SMD Schottky
Rectifier
MBRS110
0T3G
403A-03 ON Semiconductor MBRS1100T3G No Ye s
Dbw,
Dgate
2 SMD
Switching
Diode
BAS16HT
1G
SOD323 ON Semiconductor BAS16HT1G Ye s Yes
Dsec 1 SMD Schottky
Rectifier
12CWQ06
FNPBF
DPAK Vishay 12CWQ06FNPBF No Ye s
Ztvs 1 SMD TVS
Zener
1SMB100
AT3G
403A-03 ON Semiconductor
/ Multicomp
1SMB100AT3G /
SMAJ58A
Yes Ye s
Zaux1 1 SMD Zener MM3Z3V3
ST1G
SOD323 ON Semiconductor MM3Z3V3ST1G Ye s Yes
Zbr3,
Zbr4
2 SMD Zener MMSZ16T
1G
SOD123 ON Semiconductor MMSZ16T1G Ye s Ye s
Zline 1 SMD TVS
Zener
1SMA58A
T3G
SMA ON Semiconductor
/ Multicomp
1SMA58AT3G /
SMAJ58A
Yes Ye s
JOUT 1 Header, 6-Pin Header 6 HDR1X6 FCI 8614-00-36-1-Y0-10 Yes Ye s
P1 1 Header, 8-Pin Header 8 HDR1X8 FCI 8614-00-36-1-Y0-10 Yes Ye s
L1 1 Drum Core
Choke
10uH/3A 10X12 Prismatic 9404037403 No Ye s
Q1 1 MOSFET
N-CHANNEL
Si7462DP SOPP8 Vishay Siliconix Si7462DP No Ye s
Q4 1 MOSFET
N-CHANNEL
FDS3992 SO-8 Fairchild FDS3992 No Ye s
Qgate 1 Transistor
PNP
BFT92 SOT23 Philips BFT92 Ye s Yes
U2 1 HIGH
ISOLATION
VOLTAGE
SSOP
PHOTOCOUP
LER
PS2801-1-
F3-A
SSOP4 CEL PS2801-1 No Ye s
U3 1 Programmable
Shunt Voltage
Reference
TL432BID
BZTG4
SOT23 Texas-Instruments TL432BIDBZTG4 No Ye s
Rcs 1 Resistor SMD 0.1/3W 1% 2512-S Bourns CRA2512-FZ-R100ELF Ye s Yes
Rgate 1 Resistor SMD 10 1% 0805-R-S Walsin WR08X10R0FTL Ye s Yes
Rinrush1 Resistor SMD 121k 1% 0805-R-S Walsin WR08X1213FTL Ye s Yes
Rbr3,
Rbr4,
Rosc
3 Resistor SMD 150k 1% 0805-R-S Walsin WR08X1503FTL Ye s Yes
Rfb1 1 Resistor SMD 15k 1% 0805-R-S Walsin WR08X1502FTL Ye s Yes
Rbias21 Resistor SMD 20k 1% 0805-R-S Walsin WR08X2002FTL Ye s Yes
Rclass1 Resistor SMD 30.1 1% 0805-R-S Yageo RC0805FR-0730R1L Yes Ye s
Rdet1 1 Resistor SMD 24.9k 1% 0805-R-S Walsin WR08X2492FTL Ye s Yes
Rfb2 1 Resistor SMD 3.92k 1% 0805-R-S Walsin WR08X3921FTL Ye s Yes
Rsn1 1 Resistor SMD 330 /1W 5% 2512-S Walsin WR25X331JTL Ye s Yes
Raux11 Resistor SMD 39.2k 1% 0805-R-S Walsin WR08X3922FTL Ye s Yes
Rilim1 1 Resistor SMD 44.2K 1% 0805-R-S Walsin WR08X4422FTL Ye s Yes
Rbias
1, Rsl
2 Resistor SMD 5.1k 5% 0805-R-S Walsin WR08X512JTL Ye s Ye s
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Table 3. BILL OF MATERIALS
Desig-
nator
Lead
Free
Substitution
Allowed
Manufacturer Part
Number
ManufacturerFootprintToler-
ance
ValueDescriptionQua
ntity
Rbw,
Rsn2
2 Resistor SMD 75 1% 0805-R-S Walsin WR08X750JTL Ye s Ye s
Rfb3 1 Resistor SMD 820 1%
0805RS
Yageo RC0805FR-07820RL Yes Ye s
Rdet2 1 Resistor SMD 845 1% 0805-R-S Yageo RC0805FR-07845RL Ye s Yes
Rdet1’1 Resistor SMD NC 0805-R-S
Rbr1,
Rbr2
2 Resistor SMD NC 1% 0805-R-S
Q2,
Q3
2 P-Channel
30V (D-S)
MOSFET
NC POWERP
ACK
1212-8
Vishay Si7113
Csi 1 Capacitor
SMD
NC 0805-C-S
Zbr1,
Zbr2
2 SMD Zener NC SOD123 ON Semiconductor MMSZ16T1G
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
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