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參數(shù)資料
| 型號(hào)： | L9407F |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PSFM8 |
| 封裝： | MULTIWATT-8 |
| 文件頁(yè)數(shù)： | 8/14頁(yè) |
| 文件大小： | 211K |
| 代理商： | L9407F |
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L9407F
Functional description
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1
Functional description
1.1
Circuit operation
The alternator's voltage regulator performs the following main functions:
●
voltage regulation
●
protection
●
control fault diagnosis
●
load response control
1.2
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 regulators are a self-oscillating type this frequency depends on the
whole system parameter set including 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 application (2.2F or 2.7F) must be inserted between A+
and ground when using the device with very long cables.
1.3
Protection
It is present a protection against short circuits of the lamp and the relay power drivers (D+)
and of the field power driver (DF), a thermal drivers shutdown protection and an overvoltage
protection of D+ power drivers.
1.4
Diagnosis
The circuit detects fault conditions related to the phase and DF 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.
1.5
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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