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| 型号： | MAX6397ZATA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/18页 |
| 文件大小： | 0K |
| 描述： | IC SW OVERVOLT PROT 8-TDFN |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 电压 - 工作： | 72V |
| 技术： | 混合技术 |
| 功率（瓦特）： | 1.45W |
| 电路数： | 1 |
| 应用： | 通用 |
| 封装/外壳： | 8-WDFN 裸露焊盘 |
| 供应商设备封装： | 8-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
Overvoltage Protection Switch/Limiter
Controllers Operate Up to 72V
V IN
10V/div
GATE
V GATE
10V/div
V BATT
R1
IN
MAX6397
SET MAX6398
OUT
10ms/div
V OUT
10V/div
R2
GND
Figure 2a. MAX6397/MAX6398 GATE Waveform During Over-
voltage Switch Mode
V IN
10V/div
V GATE
10V/div
V OUT
10V/div
4ms/div
Figure 2b. MAX6397/MAX6398 GATE Waveform During Over-
voltage Limit Mode
GATE cycles on-off-on-off-on in a sawtooth waveform
until OUT remains below the overvoltage fault threshold
and GATE remains constantly on (V IN + 10V). The over-
voltage limiter’s sawtooth GATE output operates the
MOSFET in a switched-linear mode while the input volt-
age remains above the overvoltage fault threshold. The
sawtooth frequency depends on the load capacitance,
load current, and MOSFET turn-on time (GATE charge
current and GATE capacitance).
GATE goes high when the following startup conditions
are met: V IN is above the UVLO threshold, SHDN is
high, an overvoltage fault is not present and the device
is not in thermal shutdown.
Figure 3. Overvoltage Switch Protection Configuration
Overvoltage Monitoring
When operating in overvoltage mode, the MAX6397/
MAX6398 feedback path (Figure 3) consists of IN,
SET ’s internal comparator, the internal gate charge
pump, and the external n-channel MOSFET resulting in
a switch-on/off function. When the programmed over-
voltage threshold is tripped, the internal fast compara-
tor turns off the external MOSFET, pulling GATE to OUT
within t OV and disconnecting the power source from
the load. When IN decreases below the adjusted over-
voltage threshold, the MAX6397/MAX6398 slowly
enhance GATE above OUT, reconnecting the load to
the power source.
Overvoltage Limiter
When operating in overvoltage limiter mode, the
MAX6397/MAX6398 feedback path (Figure 4) consists
of OUT, SET’s internal comparator, the internal gate
charge pump and the external n-channel MOSFET,
which results in the external MOSFET operating as a
voltage regulator.
During normal operation, GATE is enhanced 10V above
OUT. The external MOSFET source voltage is monitored
through a resistor-divider between OUT and SET. When
OUT rises above the adjusted overvoltage threshold, an
internal comparator sinks the charge-pump current, dis-
charging the external GATE, regulating OUT at the set
overvoltage threshold. OUT remains active during the
overvoltage transients and the MOSFET continues to con-
duct during the overvoltage event, operating in switched-
linear mode.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6398ATT | 制造商:Maxim from Components Direct 功能描述:MAXIM MAX6398ATT VOLTAGE SUPERVISORS - Rail/Tube 制造商:Maxim 功能描述:Maxim MAX6398ATT Voltage Supervisors |
| MAX6398ATT+ | 制造商:Maxim Integrated Products 功能描述:VOLT SUPERVISOR CNTRLR 1.215V 6TDFN EP - Rail/Tube |
| MAX6398ATT+T | 功能描述:电压监测器/监控器 Over Volt Protection Switch/Limiter RoHS:否 制造商:Texas Instruments 监测电压数:2 监测电压:Adjustable 输出类型:Open Drain 欠电压阈值: 过电压阈值: 准确性:1 % 工作电源电压:1.5 V to 6.5 V 工作电源电流:1.8 uA 最大工作温度:+ 125 C 封装 / 箱体:SON-6 安装风格:SMD/SMT |
| MAX6398ATT-T | 功能描述:电压监测器/监控器 RoHS:否 制造商:Texas Instruments 监测电压数:2 监测电压:Adjustable 输出类型:Open Drain 欠电压阈值: 过电压阈值: 准确性:1 % 工作电源电压:1.5 V to 6.5 V 工作电源电流:1.8 uA 最大工作温度:+ 125 C 封装 / 箱体:SON-6 安装风格:SMD/SMT |
| MAX6399ATA | 制造商:Maxim Integrated Products 功能描述:OVERVOLTAGE PROTECTION SWITCH LIMIT - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
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