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參數(shù)資料
| 型號： | MAX5940B |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | IEEE 802.3af PD Interface Controller For Power-Over-Ethernet |
| 中文描述： | IEEE 802.3af PD接口控制器，用于以太網(wǎng)供電 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大小： | 295K |
| 代理商： | MAX5940B |
Inrush Current Limit
The MAX5940A/MAX5940B charge the gate of the
internal MOSFET with a constant current source (10μA,
typ). The drain-to-gate capacitance of the MOSFET lim-
its the voltage rise rate at the drain, thereby limiting the
inrush current. Add an external capacitor from GATE to
OUT to further reduce the inrush current. Use the fol-
lowing equation to calculate the inrush current:
PGOOD/
PGOOD
Outputs
(MAX5940A/MAX5940B)
PGOOD is an open-drain, active-high logic output.
PGOOD goes high impedance when V
OUT
is within 1.2V
of V
EE
and when GATE is 5V above V
EE
. Otherwise,
PGOOD is pulled to V
OUT
(given that V
OUT
is at least 5V
below GND). Connect PGOOD to the ON pin of a down-
stream DC-DC converter. Connect a 100k
pullup resis-
tor from PGOOD to GND if needed.
(MAX5940B only)
PGOOD
is an open-drain, active-low logic output.
PGOOD
is pulled to V
EE
when V
OUT
is within 1.2V of V
EE
and when GATE is 5V above V
EE
. Otherwise,
PGOOD
goes high impedance. Connect
PGOOD
to the
ON
pin of
a downstream DC-DC converter. Connect a 100k
pullup resistor from
PGOOD
to GND if needed.
Thermal Dissipation
During classification mode, if the PSE applies the maxi-
mum DC voltage, the maximum voltage drop from GND
to V
RCLASS
will be 13V. If the maximum classification
current of 42mA flows through the MAX5940A/
MAX5940B, then the maximum DC power dissipation will
be 546mW, which is slightly higher than the maximum
DC power dissipation of the IC at maximum operating
temperature. However, according to the IEEE 802.3af
standard, the duration of the classification mode is limit-
ed to 75ms (max). The MAX5940A/MAX5940B handle
the maximum classification power dissipation for the
maximum duration time without sustaining any internal
damage. If the PSE violates the IEEE 802.3af standard
by exceeding the 75ms maximum classification duration,
it may cause internal damage to the IC.
I
I
x
C
C
INRUSH
G
OUT
GATE
=
M
IEEE 802.3af PD Interface Controller
For Power-Over-Ethernet
_______________________________________________________________________________________
9
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX5940A-MAX5940B | Quadruple 2-Input Positive-NAND Buffers 14-CDIP -55 to 125 |
| MAX5940AESA | IEEE 802.3af PD Interface Controller For Power-Over-Ethernet |
| MAX5940BESA | IEEE 802.3af PD Interface Controller For Power-Over-Ethernet |
| MAX5941B | IEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power Devices |
| MAX5941A | IEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power Devices |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5940BCSA+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX5940BCSA+T | 制造商:Maxim Integrated Products 功能描述:IEEE 802.3AF PD INTERFACE CONTROLLER FOR POWER-OVER-ETHERNET - Tape and Reel |
| MAX5940BESA | 功能描述:輸入/輸出控制器接口集成電路 RoHS:否 制造商:Silicon Labs 產(chǎn)品: 輸入/輸出端數(shù)量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
| MAX5940BESA+ | 功能描述:輸入/輸出控制器接口集成電路 IEEE 802.3af PD Int Controller RoHS:否 制造商:Silicon Labs 產(chǎn)品: 輸入/輸出端數(shù)量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
| MAX5940BESA+T | 功能描述:輸入/輸出控制器接口集成電路 IEEE 802.3af PD Int Controller RoHS:否 制造商:Silicon Labs 產(chǎn)品: 輸入/輸出端數(shù)量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
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