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参数资料
| 型号： | MAX5921FESA+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 12/18页 |
| 文件大小： | 386K |
| 描述： | IC HOT-SWAP CTRLR -48V 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电源电压： | -20 V ~ -80 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
-48V Hot-Swap Controllers with External
R
SENSE
and High Gate Pulldown Current
12 ______________________________________________________________________________________
Overcurrent Fault Integrator
The MAX5921/MAX5939 feature an overcurrent fault inte-
grator. When an overcurrent condition is detected, an
internal digital counter is incremented. The clock period
for the digital counter is 32祍 for the 500祍 maximum
current-limit duration version and 128祍 for 2ms maxi-
mum current-limit duration devices. An overcurrent of
less than 32祍 is interpreted as an overcurrent of 32祍.
When the counter reaches 500祍 (the maximum current-
limit duration) for the MAX5921/MAX5939A, an overcur-
rent fault is generated. If the overcurrent fault does not
last 500祍, then the counter begins decrementing at a
rate 128 (maximum current-limit duty cycle) times slower
than the counter was incrementing. Repeated overcur-
rent conditions generate a fault if the duty cycle of the
overcurrent condition duty ratio is greater than the maxi-
mum current-limit duty cycle (see Figure 14).
Thermal Shutdown
The MAX5921/MAX5939 include internal die-tempera-
ture monitoring. When the die temperature reaches the
thermal-shutdown threshold, T
OT
, the MAX5921/
MAX5939 pull GATE low and turn off the external MOS-
FET. If a good thermal path is provided between the
MOSFET and the MAX5921/MAX5939, the device offers
thermal protection for the external MOSFET. Placing the
MAX5921/MAX5939 near the drain of the external MOS-
FET offers the best thermal protection because most of
the power is dissipated in its drain.
After a thermal shutdown fault has occurred, the
MAX5921_ turns the external FET off for a minimum
time of t
OFF
, allowing the MOSFET to cool down. The
MAX5921_ device restarts after the temperature drops
20癈 below the thermal-shutdown threshold.
The MAX5939_ latches off after a thermal shutdown
fault. The MAX5939_ can be restarted by toggling UV
low or cycling power. However, the device keeps the
external FET off for a minimum time of t
OFF
when tog-
gling UV.
Applications Information
Sense Resistor
The circuit-breaker current-limit threshold is set to 50mV
(typ). Select a sense resistor that causes a drop equal
to or above the current-limit threshold at a current level
above the maximum normal operating current. Typically,
set the overload current to 1.5 to 2.0 times the nominal
load current plus the dynamic load-capacitance charg-
ing current during startup. Choose the sense resistor
power rating to be greater than (V
CL
)
2
/ R
SENSE
.
V
GATE
- V
EE
2V/div
I
D
(Q1)
2A/div
10ms/div
Figure 9. Automatic Restart After a Short Circuit
V
EE
V
DD
OV
UV
-48V
V
UV
= 1.255
R4 + R5 + R6
R5 + R6
R4
R5
R6
3
2
4
8
V
OV
= 1.255
R4 + R5 + R6
R6
MAX5921
MAX5939
-48V RTN
(SHORT PIN)
-48V RTN
Figure 10. Undervoltage and Overvoltage Sensing
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5921FESA+ | 功能描述:热插拔功率分布 48V- Hot-Swap Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5921FESA+T | 功能描述:热插拔功率分布 48V- Hot-Swap Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5921FESA-T | 功能描述:热插拔功率分布 RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5922AEUI | 功能描述:热插拔功率分布 RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5922AEUI+ | 功能描述:热插拔功率分布 48V Single-Port Network Power Switch RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
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