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参数资料
| 型号： | NCP1082DEG |
| 厂商： | ON Semiconductor |
| 文件页数： | 4/17页 |
| 文件大小： | 214K |
| 描述： | IC CONV CTLR POE-PD 13W 20-TSSOP |
| 标准包装： | 74 |
| 类型： | 以太网供电开关（PoE） |
| 应用： | 远程外设（工业控制，相机，数据访问） |
| 内部开关： | 是 |
| 电流限制： | 500mA |
| 电源电压： | 0 V ~ 57 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 20-TSSOP-EP |
| 包装： | 管件 |
NCP1082
http://onsemi.com
4
SIMPLIFIED APPLICATION DIAGRAMS
Figure 4. NonIsolated Flyback with Extra Winding and Rear Auxiliary Support
NCP1082
Rcs
Cvddl
Cvddh
Cpd
Css
Rosc
M1
T1
Cload
LD1
Rd1
Rclass
Rilim1
Rinrush
Rslope
Voutput
D1
GATE
RTN
FB
VPORTN2
VDDH
VDDL
VPORTN1
CLASS
ARTN
ILIM1
INRUSH
TEST
AUX
UVLO
CS
VPORTP
Data
Pairs
Spare
Pairs
R1
R2
RJ45
DB1
DB2
Raux1
VAUX(+)
VAUX()
Raux2
Raux3
D3
D4
Cline
Z_line
COMP
SS
OSC
R3
R4
C1comp
C2comp
Rcomp
R5
D2
Figure 4 shows the same nonisolated flyback configuration as Figure 3, but adds a 12 V auxiliary bias winding on the
transformer to provide power to the NCP1082 DCDC controller via its VDDH pin. This topology shuts off the current flowing
from VPORTP to VDDH and therefore reduces the internal power dissipation of the PD, resulting in higher overall power
efficiency.
Figure 5. NonIsolated Forward Converter with Rear Auxiliary Support
NCP1082
Rcs
Cvddl
Cvddh
Cpd
Css
Rosc
M1
T1
Cload
LD1
Rd1
Rclass
Rilim1
Rinrush
Rslope
Voutput
D1
GATE
RTN
FB
VPORTN2
VDDH
VDDL
VPORTN1
CLASS
ARTN
ILIM1
INRUSH
TEST
AUX
UVLO
CS
VPORTP
Data
Pairs
Spare
Pairs
R1
R2
RJ45
DB1
DB2
Raux1
VAUX(+)
VAUX()
Raux2
Raux3
D4
D5
Cline
Z_line
COMP
SS
OSC
R3
R4
C1comp
C2comp
Rcomp
D3
D2
L1
Figure 5 shows the NCP1082 used in a nonisolated forward topology.
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