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参数资料
| 型号： | NCP1081DEG |
| 厂商： | ON Semiconductor |
| 文件页数： | 4/18页 |
| 文件大小： | 257K |
| 描述： | IC CONV CTLR POE-PD 40W 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： | 1.1A |
| 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 |
NCP1081
http://onsemi.com
4
SIMPLIFIED APPLICATION DIAGRAMS
Figure 4. NonIsolated Flyback with Extra Winding
Cpd
NCP1081
GATE
RTN
FB
VPORTN2
VDDH
VDDL
Rcs
Cvddh
C1comp
C2comp
Rcomp
Css
M1
R4
VPORTN1
CLASS
ARTN
ILIM1
INRUSH
TEST1
TEST2
Rclass
Rilim1
Rinrush
R1
R2
UVLO
CS
VPORTP
Rslope
D1
D2
T1
R5
Voutput
Spare
Pairs
RJ45
DB1
DB2
LD1
Rd1
Cvddl
nCLASS_AT
R3
Cload
Rosc
Data
Pairs
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 NCP1081 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
Cpd
NCP1081
GATE
RTN
FB
VPORTN2
VDDH
VDDL
Rcs
Cvddh
C1comp
C2comp
Rcomp
Css
M1
Cload
R3
R4
VPORTN1
CLASS
ARTN
ILIM1
INRUSH
TEST1
TEST2
Rclass
Rilim1
Rinrush
R1
R2
UVLO
CS
VPORTP
L1
Rslope
Voutput
T1
D1
D2
D3
Spare
Pairs
RJ45
DB1
DB2
LD1
Rd1
Cvddl
nCLASS_AT
Data
Pairs
Rosc
Figure 5 shows the NCP1081 used in a nonisolated forward topology.
High Power Considerations
The NCP1081 is designed to implement various
configurations of highpower PoE systems including those
based on the IEEE802.3at standard. High power operation
can be enabled by a Dual Event Layer 1 classification or a
Single Event Layer 1 classification combined with a Layer 2
high power classification. The NCP1081 also supports
proprietary designs capable of delivering 25 W to 40 W to
the load in twopair configurations. A separate application
note describes these implementations (AND8332).
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相关代理商/技术参数 |
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| NCP1081DER2G | 功能描述:DC/DC 开关控制器 POE-PD 40W DC-DC RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| NCP1081SPCGEVB | 功能描述:电源管理IC开发工具 HPOWER POE-PD SPLITTER RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| NCP1082 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Integrated PoE-PD & DC-DC Converter Controller with 9V Auxiliary Supply Support |
| NCP1082DEG | 功能描述:直流/直流开关转换器 POE-PD 13W DC-DC AUX SUPP RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| NCP1082DER2G | 功能描述:直流/直流开关转换器 POE-PD 13W DC-DC AUX SUPP RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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