参数资料
| 型号： | MAX6496ATA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/16页 |
| 文件大小： | 0K |
| 描述： | IC CTLR PROT SW 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： | 1 |
| 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： | 标准包装 |
| 其它名称： | MAX6496ATA+TDKR |
MAX6495–MAX6499
72V, Overvoltage-Protection Switches/
Limiter Controllers with an External MOSFET
10
Maxim Integrated
where IGATE is GATE’s 100A sourcing current, ILOAD
is the load current at startup, and COUT is the output
capacitor.
MOSFET Selection
Select external MOSFETs according to the application
current level. The MOSFET’s on-resistance (RDS(ON))
should be chosen low enough to have a minimum volt-
age drop at full load to limit the MOSFET power dissipa-
tion. Determine the device power rating to
accommodate an overvoltage fault when operating the
MAX6495/MAX6496/MAX6499 in overvoltage-limit mode.
During normal operation, the external MOSFET dissi-
pates little power. The power dissipated in the MOSFET
during normal operation is:
P= ILOAD2 x RDS(ON)
where P is the power dissipated in the MOSFET, ILOAD
is the output load current, and RDS(ON) is the drain-to-
source resistance of the MOSFET.
Most power dissipation in the MOSFET occurs during a
prolonged overvoltage event when operating the
MAX6495/MAX6496/MAX6499 in voltage-limiter mode.
The power dissipated across the MOSFET is as follows
(see the
Thermal Shutdown in Overvoltage-Limiter
Mode section):
P = VDS x ILOAD
where VDS is the voltage across the MOSFET’s drain
and source.
Thermal Shutdown
The MAX6495–MAX6499 thermal-shutdown feature
turns off GATE if it exceeds the maximum allowable
thermal dissipation. Thermal shutdown also monitors
the PC board temperature of the external n-channel
MOSFET when the devices sit on the same thermal
island. Good thermal contact between the MAX6495–
MAX6499 and the external n-channel MOSFET is essen-
tial for the thermal-shutdown feature to operate effec-
tively. Place the n-channel MOSFET as close to
possible to OUTFB.
When the junction temperature exceeds TJ = +160°C,
the thermal sensor signals the shutdown logic, turning
off the GATE output and allowing the device to cool.
The thermal sensor turns the GATE on again after the
IC’s junction temperature cools by 20°C. Thermal-over-
load protection is designed to protect the MAX6495–
MAX6499 and the external MOSFET in the event of cur-
rent-limit fault conditions. For continuous operation, do
not exceed the absolute maximum junction-temperature
rating of TJ = +150°C.
Peak Power-Dissipation Limit
The MAX6495–MAX6499 activate an internal 100mA
pulldown on GATE when
SHDN goes low, OVSET
exceeds its threshold or UVSET falls below its threshold.
Once the voltage on GATE falls below the OUTFB volt-
age, current begins to flow from OUTFB to the 100mA
pulldown through the internal clamp diode, discharging
the output capacitors.
Depending on the output capacitance and the initial volt-
age, a significant amount of energy may be dissipated
by the internal 100mA pulldown. To prevent damage to
the device ensure that for a given overvoltage threshold,
the output capacitance does not exceed the limit provid-
ed in Figure 4. This output capacitance represents the
sum of all capacitors connected to OUTFB, including
reservoir capacitors and DC-DC input filter capacitors.
Thermal Shutdown in Overvoltage-Limiter Mode
When operating the MAX6495/MAX6496/MAX6499 in
overvoltage-limit mode for a prolonged period of time, a
thermal shutdown is possible. The thermal shutdown is
dependent on a number of different factors:
The device’s ambient temperature
The output capacitor (COUT)
The output load current (IOUT)
The overvoltage threshold limit (VOV)
MAXIMUM OUTPUT CAPACITANCE
vs. OVERVOLTAGE THRESHOLD
MAX6495
fig04
OVERVOLTAGE THRESHOLD (V)
MAXIMUM
OUTPUT
CAPACITANCE
(μ
F)
60
50
40
30
20
10
100
1000
10,000
100,000
10
070
SAFE OPERATING AREA
Figure 4. Safe Operating Area for 100mA Pulldown.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6496EVKIT+ | 功能描述:电源管理IC开发工具 MAX6496 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX6497ATA+ | 制造商:Maxim Integrated Products 功能描述:OVERVOLT PROT CNTRLR 8TDFN EP - Rail/Tube |
| MAX6497ATA+T | 功能描述:电流和电力监控器、调节器 72V Over V Protect Switch/Limiter RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX6498ATA+ | 制造商:Maxim Integrated Products 功能描述:OVERVOLT PROT CNTRLR 8TDFN EP - Rail/Tube |
| MAX6498ATA+T | 功能描述:电流和电力监控器、调节器 72V Over V Protect Switch/Limiter RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
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