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參數(shù)資料
| 型號： | MAX6397MATA-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, DSO8 |
| 封裝： | 3 X 3 MM, 0.80 MM HEIGHT, MO-229WEEC, TDFN-8 |
| 文件頁數(shù)： | 2/18頁 |
| 文件大小： | 299K |
| 代理商： | MAX6397MATA-T |
MAX6397/MAX6398 As the transient begins decreasing, OUT fall time will
depend on the MOSFET’s GATE charge, the internal
charge-pump current, the output load, and the tank
capacitor at OUT.
For fast-rising transients and very large-sized MOSFETs,
add an additional external bypass capacitor from GATE
to GND to reduce the effect of the fast-rising voltages at
IN. The external capacitor acts as a voltage-divider
working against the MOSFETs’ drain-to-gate capaci-
tance. For a 6000pF Cgd, a 0.1F capacitor at GATE will
reduce the impact of the fast-rising VIN input.
Caution must be exercised when operating the
MAX6397/MAX6398 in voltage-limiting mode for long
durations. If the VIN is a DC voltage greater than the
MOSFET’s maximum gate voltage, the FET will dissipate
power continuously. To prevent damage to the external
MOSFET, proper heatsinking should be implemented.
Applications Information
Load Dump
Most automotive applications run off a multicell, 12V
lead-acid battery with a nominal voltage that swings
between 9V and 16V (depending on load current,
charging status, temperature, battery age, etc.). The
battery voltage is distributed throughout the automobile
and is locally regulated down to voltages required by
the different system modules. Load dump occurs when
the alternator is charging the battery and the battery
becomes disconnected. Power in the alternator (essen-
tially an inductor) flows into the distributed power sys-
tem and elevates the voltage seen at each module. The
voltage spikes have rise times typically greater than
5ms and decays within several hundred milliseconds
but can extend out to 1s or more depending on the
characteristics of the charging system (Figure 5).
These transients are capable of destroying semicon-
ductors on the first ‘fault event.’
Setting Overvoltage Thresholds
SET provides an accurate means to set the overvoltage
level for the MAX6397/MAX6398. Use a resistor-divider to
set the desired overvoltage condition (Figure 6). SET has
a rising 1.215V threshold with a 5% falling hysteresis.
Begin by selecting the total end-to-end resistance,
RTOTAL = R1 + R2. Choose RTOTAL to yield a total cur-
rent equivalent to a minimum 100 x ISET (SET’s input
bias current) at the desired overvoltage threshold.
For example:
With an overvoltage threshold set to 20V:
RTOTAL < 20V/(100 x ISET)
where ISET is SET’s 50nA input bias current.
RTOTAL < 4M
Use the following formula to calculate R2:
where VTH is the 1.215V SET rising threshold and VOV
is the overvoltage threshold.
R2 = 243k
, use a 240k standard resistor.
RTOTAL = R2 + R1, where R1 = 3.76M.
Use a 3.79M
standard resistor.
A lower value for total resistance dissipates more
power but provides slightly better accuracy.
RV
R
V
TH
TOTAL
OV
2
=×
Overvoltage Protection Switch/Limiter
Controllers Operate Up to 72V
10
______________________________________________________________________________________
MAX6397
MAX6398
IN
SET
GATE
OUT
GND
VBATT
R1
R2
COUT
Figure 4. Overvoltage Limiter Protection Switch Configuration
100ms
200ms
300ms
400ms
tRISE > 5ms
VPEAK
VBATT
Figure 5. Load Dump Voltage Profile
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6397SATA | 制造商:Maxim Integrated Products 功能描述:OVERVOLTAGE PROTECTION SWITCH/LIMIT - Rail/Tube |
| MAX6397SATA+ | 制造商:Maxim Integrated Products 功能描述:VOLT SUPERVISOR CNTRLR 1.215V 8TDFN EP - Rail/Tube |
| MAX6397SATA+T | 功能描述:監(jiān)控電路 Over Volt Protection Switch/Limiter RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6397SATA-T | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6397TATA | 制造商:Maxim Integrated Products 功能描述:OVERVOLTAGE PROTECTION SWITCH/LIMIT - Rail/Tube |
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