参数资料
| 型号： | MAX5980EVKIT# |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/49页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT MAX5980 |
| 标准包装： | 1 |
| 系列： | * |
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Quad, IEEE 802.3at/af PSE Controller
for Power-over-Ethernet
80ms
150ms
t DET(1)
150ms
t DET(2)
19ms
t CLASS
t
0V
-4V
-9.1V
-18V
-54V
V OUT_ - V AGND
Figure 1. Detection, Classification, and Port Power-Up Sequence
2-Event PD Classification
If the result of the first classification event is Class 0 to 3,
then only a single classification event occurs as shown
in Figure 1. However, if the result is Class 4 (or Class
5), the device will perform a second classification event
as shown in Figure 2. Between the classification cycles,
the device performs a first and second mark event as
required by the IEEE 802.3at standard, forcing a -9.3V
probing voltage at OUT_.
Powered State
When the device enters a powered state, the t FAULT
timer is reset and power is delivered to the PD. PGOOD_
(R10h[7:4], Table 16) is set to 1 when the device
enters the normal power condition. PGOOD_ immedi-
ately resets to 0 whenever the power to the port is turned
off. The power-good change bits, PG_CHG_ (R02h[3:0],
Table 8) are set both when the port powers up and when
it powers down.
18
Overcurrent Protection
A sense resistor, R SENSE_ , connected between SENSE_
and SVEE_ monitors the load current. Under normal oper-
ating conditions, the voltage across R SENSE_ (V RSENSE_ )
never exceeds the current-limit threshold, V SU_LIM . If
V RSENSE_ exceeds V SU_LIM , an internal current-limiting
circuit regulates the GATE_ voltage, limiting the current
to I LIM = V SU_LIM /R SENSE_ . During transient conditions,
if V RSENSE_ exceeds V SU_LIM by more than 500mV, a
fast pulldown circuit activates to quickly recover from the
current overshoot. During startup, if the current-limit con-
dition persists, when the startup timer, t START , times out,
the port shuts off, and the TSTART_ bit is set (R08h[3:0]
and R09h[3:0], Table 11).
In the normal powered state, the device checks for
overcurrent conditions as determined by V CUT . The
t FAULT counter sets the maximum allowed continuous
overcurrent period. The t FAULT counter increases when
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| MAX5980EVKIT# | 功能描述:电源开关 IC - POE / LAN MAX5980 Eval Kit RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6 |
| MAX5980EVKIT+ | 功能描述:电源开关 IC - POE / LAN RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6 |
| MAX5980GTJ+ | 功能描述:电源开关 IC - POE / LAN 0-16V Hot-Swap Controller RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6 |
| MAX5980GTJ+T | 功能描述:电源开关 IC - POE / LAN 0-16V Hot-Swap Controller RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6 |
| MAX5980UTJ+ | 功能描述:电源开关 IC - POE / LAN 0-16V Hot-Swap Controller RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6 |
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