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参数资料
| 型号： | NCP1081DEG |
| 厂商： | ON Semiconductor |
| 文件页数： | 14/18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
14
ILIM1 /
INRUSH
VDDA1
Vbg1
VDDA1
VPORTNx
Ilim_ref
NCP1081
Figure 11. Current Limitation Configuration (Inrush & Ilim1 Pins)
Ilim1
Vds_pgood
threshold
VPORTNx
Pass Switch
Inrush
I_pass_switch
NCP1081
RTN
VDS_PGOOD
0
1
VDDA1
VDDA1
1 V / 9.2 V
2 V
Current_limit_ON
&
detector
Figure 12. Inrush and Ilim1 Selection Mechanism
VDDA1
When VPORT reaches the UVLO_on level, the Cpd
capacitor is charged with the INRUSH current (in order to
limit the internal power dissipation of the passswitch).
Once the Cpd capacitor is fully charged, the current limit
switches from the inrush current to the current limit level
(ilim1) as shown in Figure 12. This transition occurs when
both following conditions are satisfied:
1. The VDS of the passswitch is below the
Vds_pgood low level (1 V typical).
2. The passswitch is no longer in current limit
mode, meaning the gate of the passswitch is
high (above 2 V typical).
The operational current limit will stay selected as long as
Vds_pgood is true (meaning that RTNVPORTN
1,2
is
below the high level of Vds_pgood). This mechanism allows
a current level transition without any current spike in the
passswitch because the operational current limit (ilim1) is
enabled once the passswitch is not limiting the current
anymore, meaning that the Cpd capacitor is fully charged.
Thermal Shutdown
The NCP1081 includes thermal protection which shuts
down the device in case of high power dissipation. Once the
thermal shutdown (TSD) threshold is exceeded, following
blocks are turned off:
" DCDC controller
" Passswitch
" VDDH and VDDL regulators
" CLASS regulator
When the TSD error disappears and if the input line
voltage is still above the UVLO level, the NCP1081
automatically restarts with the current limit set in the inrush
state, the DCDC controller is disabled and the Css
(softstart capacitor) discharged. The DCDC controller
becomes operational as soon as capacitor Cpd is fully
charged.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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