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參數資料
| 型號： | MAX5952CUAX+ |
| 廠商： | Maxim Integrated |
| 文件頁數： | 20/50頁 |
| 文件大?。?/td> | 1006K |
| 描述： | IC PSE CNTRLR FOR POE 36-SSOP |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 30 |
| 類型： | 以太網供電控制器（PoE） |
| 應用： | 遠程外設（工業控制，相機，數據訪問） |
| 內部開關： | 無 |
| 工作溫度： | 0°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 36-BSOP（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 36-SSOP |
| 包裝： | 管件 |
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High-Power, Quad, PSE Controller
for Power-Over-Ethernet
20 ______________________________________________________________________________________
Figure 3a. Foldback Current Characteristics
48V
28V
V
SU_LIM
V
SU_LIM
/ 3
(V
SENSE_
- V
EE
)
(V
OUT_
- V
EE
)
Figure 3b. Foldback Current Characteristics for High-Power
Mode
48V
10V
V
SU_LIM
V
SU_LIM
/ 3
(V
RS
- V
EE
)
(V
OUT_
- V
EE
)
High-Power Mode
When CL_DISC (R17h[2]) is set to 0, high-power mode
is configured by setting the ICUT bits to any combina-
tion other than 000, 110, or 111 (note that 000 is the
default value for the IEEE standard limit). See Table 3
and the Register Map and Description section.
Foldback Current
During startup and normal operation, an internal circuit
senses the voltage at OUT_ and reduces the current-
limit value when (V
OUT
_ - V
EE
) > 28V. The foldback
function helps to reduce the power dissipation on the
FET. The current limit eventually reduces to 1/3 of I
LIM
when (V
OUT
_ - V
EE
) > 48V (see Figure 3a). For high-
power mode, the foldback starts when (V
OUT
_ - V
EE
) >
10V (see Figure 3b). In high-power mode, the current
limit (I
LIM
) is reduced up to 1/8 of its programmed value
when (V
OUT
_ - V
EE
) > 48V.
MOSFET Gate Driver
Connect the gate of the external n-channel MOSFET to
GATE_. An internal 50礎 current source pulls GATE_ to
(V
EE
+ 10V) to turn on the MOSFET. An internal 40礎
current source pulls down GATE_ to V
EE
to turn off the
MOSFET.
The pullup and pulldown current controls the maximum
slew rate at the output during turn-on or turn-off. Use
the following equation to set the maximum slew rate:
where C
GD
is the total capacitance between GATE and
DRAIN of the external MOSFET. Current limit and the
capacitive load at the drain control the slew rate during
startup. During current-limit regulation, the MAX5952
manipulates the GATE_ voltage to control the voltage at
SENSE_ (V
RS
). A fast pulldown activates if V
RS
over-
shoots the limit threshold (V
SU_LIM
). The fast pulldown
current increases with the amount of overshoot. The
maximum fast pulldown current is 100mA.
During turn-off, when the GATE voltage reaches a value
lower than 1.2V, a strong pulldown switch is activated
to keep the MOSFET securely off.
V
t
I
C
OUT
GATE
GD
=
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX5952CUAX+ | 功能描述:熱插拔功率分布 Quad PSE Controller for POE RoHS:否 制造商:Texas Instruments 產品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5952CUAX+T | 功能描述:熱插拔功率分布 Quad PSE Controller for POE RoHS:否 制造商:Texas Instruments 產品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5952DEAX+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX5952DEAX+T | 制造商:Maxim Integrated Products 功能描述:HIGH-POWER QUAD PSE CONTROLLER FOR - Tape and Reel |
| MAX5952DUAX+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
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