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| 型号： | NCP1082DEG |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/17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
12
Auxiliary Supply Support
To support applications connected to non PoE enabled
networks and minimize the bill of materials, the NCP1082
supports drawing power from an external supply. The
NCP1082 supports the IEEE 802.3af standard when the PoE
capability is available and acts as a regular DC-DC converter
when there is no power source on the Ethernet cable as
shown in Figure 11.
Auxiliary supply support can be implemented in three
ways depending on where the auxiliary supply is injected.
The front, rear and direct auxiliary supply configurations are
explained in more detail in the application note AND9080.
UVLO
VPORTN1,2
NCP1082
VPORTP
Rdet1
Raux2
VAUX(+)
Rdet2
Pass
Switch
RTN
Raux1
Raux3
AUX
D1
D2
POE(+)
POE()
VPORT
Cpd
DCDC Stage
VAUX()
to VPORTN1,2 (Front AUX Configuration)
to RTN (Rear AUX Configuration)
Or
Figure 11. Front and Rear Auxiliary Supply Input with Support for Very Low Input Voltages
Optional
for very low
VAUX only
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
NCP1082 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 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 12.
ILIM1 /
INRUSH
VDDA1
Vbg1
VDDA1
VPORTNx
Ilim_ref
NCP1082
Figure 12. Current Limitation Configuration (Inrush & Ilim1 Pins)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| NCP1083 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Integrated High Power PoE-PD Interface & DC-DC Converter Controller with 9V Auxiliary Supply Support |
| NCP10-837R-D | 制造商:Panduit Corp 功能描述: |
| NCP1083DEG | 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 |
| 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 |
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