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參數(shù)資料
| 型號(hào)： | L9911F |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | BRUSH DC MOTOR CONTROLLER, SFM8 |
| 封裝： | ROHS COMPLIANT, MULTIWATT-8 |
| 文件頁(yè)數(shù)： | 15/19頁(yè) |
| 文件大?。?/td> | 276K |
| 代理商： | L9911F |
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L9911
Circuit operation
Doc ID 10990 Rev 6
5/19
1
Circuit operation
The alternator's voltage regulator performs the following main functions:
1.
voltage regulation
2.
protection
3.
control fault diagnosis
4.
load response control
1.1
Voltage regulation
The alternator voltage is compared with a reference voltage in an amplifier, whose output
determines the switching frequency of output power MOS whose current excites the coil of
the alternator; as the regulator is in fixed-frequency topology, the field switching frequency
does not depend on the alternator characteristics. The regulators have an integrated filter in
the voltage sensing path guaranteeing the correct behavior of the devices also when the
rectifier diodes feature very high switching spikes. The internal filtering allows the usage of
the device also with very long cables connecting the alternator to the battery with an
impedance so high to cause a superimposed ripple on the alternator voltage higher than 5-
6V. Consequently it doesn't need, in the standard application, any external component.
Anyway an external capacitor (2.2F) must be inserted between A+ and ground when using
the device with very long cables.
1.2
Protection
It is present a protection against short circuits of the lamp and the relay power drivers (L)
and of the field power driver (F+), a thermal drivers shutdown protection and an overvoltage
protection of L power drivers.
1.3
Diagnosis
The circuit detects fault conditions related to the phase and F+ status and receives
informations from one of the three alternator phases. In order to prevent spurious
indications, fault warnings are not displayed immediately but are delayed by a fixed time.
1.4
Load response control
The internal circuit regulates the soft start characteristics (activated always at engine start)
and the soft attack characteristics.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L9911I | 功能描述:低壓差穩(wěn)壓器 - LDO Car Alternator Reg Multifunction Volt RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| L9911K | 功能描述:低壓差穩(wěn)壓器 - LDO Multi Smart Volt REG DC 24V 4W 7 to 18V RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| L9911P | 功能描述:低壓差穩(wěn)壓器 - LDO Car Alternator Reg Multifunction Volt RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| L9911U | 制造商:STMicroelectronics 功能描述:PTS SMARTPOWER - Rail/Tube 制造商:STMicroelectronics 功能描述:IC VREG MULTIFUN AUTO MULTIWATT8 制造商:STMicroelectronics 功能描述:PTS Smartpower |
| L9911V | 功能描述:低壓差穩(wěn)壓器 - LDO Car Alternator Reg Multifunction Volt RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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