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参数资料
| 型号： | MAX5952CUAX+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 20/50页 |
| 文件大小： | 1006K |
| 描述： | IC PSE CNTRLR FOR POE 36-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1,000 |
| 类型： | 以太网供电控制器（PoE） |
| 应用： | 远程外设（工业控制，相机，数据访问） |
| 内部开关： | 无 |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-BSOP（0.295"，7.50mm 宽） |
| 供应商设备封装： | 36-SSOP |
| 包装： | 带卷 (TR) |
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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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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX5952DUAX+T | 制造商:Maxim Integrated Products 功能描述:HIGH-POWER QUAD PSE CONTROLLER FOR - Tape and Reel |
| MAX5953AUTM+ | 功能描述:电压模式 PWM 控制器 IEEE 802.3af PD Int & PWM Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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