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参数资料
| 型号： | NCP1083DEG |
| 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 |
NCP1083
http://onsemi.com
14
When the auxiliary input supply is above 13.5 V, connect
the AUX pin to VPORTN
1,2
. When the auxiliary supply is
below 13.5 V (but above 9 V), calculate the voltage dividers
Raux1, Raux3 and Raux2, Rdet1, Rdet2 to divide the input
voltage using the below formulas together with the formulas
from the previous section. This will ensure that for valid input
voltages, the voltage at the UVLO and AUX pins are above
their threshold voltages. Note that the maximum voltage is
3.3 V.
R
aux3
+
R
aux1
V
t
V
aux
* V
dp
* V
t
R
aux1
+ 20 kW
R
aux2
+
V
aux
* V
dp
* V
d
* V
t
V
t
845
*
V
aux
*V
dp
*V
d
*V
t
24 K
Where V
d
is the voltage drop over the rectifiers and masking
diodes (typical 0.6 V), V
dp
is the forward drop of the
NCP1083 internal diode (typical 0.5 V), and V
t
is the
threshold voltage on the AUX pin (typical 1.5 V).
Note that as soon as the auxiliary supply is connected the
PoE interface (detection and classification) is disabled and
does not allow the PD device to be powered from the
Ethernet until the auxiliary supply is removed.
If the PoE PD device was drawing the current from the
Ethernet cable before the auxiliary supply is connected, the
power will continue to be supplied from the Ethernet cable
unless the voltage of the auxiliary supply is higher than the
Ethernet supply voltage.
Inrush and Operational Current Limitations
The inrush current limit and the operational current limit
are programmed individually by an external Rinrush and
Rilim1 resistors respectively connected between INRUSH
and VPORTN
1,2
, and between ILIM1 and VPORTN
1,2
as
shown in Figure 14.
ILIM1 /
INRUSH
VDDA1
Vbg1
VDDA1
VPORTNx
Ilim_ref
NCP1083
Figure 14. Current Limitation Configuration (Inrush & Ilim1 Pins)
Ilim1
Vds_pgood
threshold
VPORTNx
Pass Switch
Inrush
I_pass_switch
NCP1083
RTN
VDS_PGOOD
0
1
VDDA1
VDDA1
1 V / 9.2 V
2 V
Current_limit_ON
&
detector
Figure 15. Inrush and Ilim1 Selection Mechanism
VDDA1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1083DER2G | 功能描述:DC/DC 开关控制器 POE-PD 40W DC-DC AUX SUPP 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 |
| NCP1083QBCGEVB | 功能描述:电源管理IC开发工具 HIGH POWER POE-PD MODULE 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 |
| NCP1083WIRGEVB | 功能描述:电源管理IC开发工具 POE-PD MODULE WITH VAUX 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 |
| NCP1086 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:1.5 A Adjustable and 3.3 V Fixed Output Linear Regulator |
| NCP1086/D | 制造商:未知厂家 制造商全称:未知厂家 功能描述:1.5 A Adjustable and 3.3 V Fixed Output Linear Regulator |
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