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參數(shù)資料
| 型號(hào)： | NCP1094MNRG |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 2/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC INTERFACE CTLR POE-PD 10-DFN |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | HIPO™ |
| 控制器類型： | PoE-PD 接口 |
| 接口： | IEEE 802.3af |
| 電流 - 電源： | 500mA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-VFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 10-DFN-EP（3x3） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | NCP1094MNRGOSDKR |
NCP1093, NCP1094
http://onsemi.com
10
Auxiliary Supply
To support application connected to nonPoE enabled
networks and minimize the bill of materials, the NCP1094
supports drawing power from an external supply and allows
simplified designs with PoE or auxiliary supply priorities.
In most of the cases, the auxiliary supply is connected
between VPORTP and RTN with a serial diode between
VPORTP and VAUX, as shown in Figure 10.
NCP1094
Data
Pairs
Cline
Spare
Pairs
Rclass
Rinrush
RJ45
DB1
DB2
Z_line
RTN
VPORTN
CLASS
INRUSH
AUX
VPORTP
DET
To DCDC
Converter
Cpd
PGOOD
Rdet
VAUX (+)
VAUX ()
Figure 10. Auxiliary Supply Dominant PD Interface
The NCP1094 offers an AUX input pin which turns off the
pass switch when pulled high. This feature is useful for PD
applications where the auxiliary supply has to be dominant
over the PoE supply. When the auxiliary supply is inserted
on a POE powered application, the pass switch
disconnection will move the current path from the PSE to the
rear auxiliary supply. Since the current delivered by the PSE
will goes below the DC MPS level (specified in IEEE
802.3 af/at standard), the PSE will disconnect the PoEPD
and the application will remain supplied by the auxiliary
supply. The transition will happen without any power
conversion interruption since the PGOOD indicator stays
active (high impedance state).
Figure 11 depicts an other PD application where the POE
supply is dominant over the VAUX supply. A diode D1 has
been added in order to not corrupt the PD detection signature
when the dcdc converter is supplied by VAUX.
NCP1094
Data
Pairs
Cline
Spare
Pairs
Rclass
Rinrush
RJ45
DB1
DB2
Z_line
RTN
VPORTN
CLASS
INRUSH
AUX
VPORTP
DET
To DCDC
Converter
Cpd
PGOOD
Rdet
VAUX (+)
VAUX ()
D1
Figure 11. PoE Supply Dominant PD Interface
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