L9915

STMICROELECTRONICS  L9915  芯片, C-端 交流发电机电压调节器, 多瓦特

The is a monolithic Alternator Voltage Regulator, includes the control section, the field power stage, fault diagnostic circuit which drives a warning lamp and the protection against short circuits. This device regulates in close loop the output of an automotive generator by controlling the field winding current by means of a pulse-width modulation PWM high side driver at fixed frequency. The set-point voltage reference selected by the Engine Control Unit via C-terminal protocol is temperature flat. An internal voltage reference thermally compensated is present in the device and used when the protocol coming from ECU is absent or the wire is broken. A self-bias circuitry is present on L pin in order to turn-ON the warning lamp also when the device is not supplied battery connection broken.

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High side field driver

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Field short circuit protection

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Regulated voltage driven by ECU protocol driven

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Regulated voltage thermally compensated without protocol

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Self start function

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Load response control LRC

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Field monitor FM output

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Thermal shutdown