Alternator voltage regulator with load response （交流发电机电压调节器与负载响应）.pdf

L9409 Alternator voltage regulator with load response control Features ■ IC regulator for 12 V type alternator ■ Fixed frequency regulation loop ■ 130 mhigh side field driver ■ Fail safe device with double sensing of battery voltage (VB and VS) ■ Load response control (LRC) function activates after an initial time delay Multiwatt8 ■ Self start function from phase frequency ■ “Z” shaped regulation curve compliant with VW specification. of sudden electrical loads during alternator low ■ Key recognition from L input speed operations (f 310 Hz). Both the analog and digital duty cycle are applied to a high side ■ Field driver, lamp driver and relay driver short driver. protection The device is able to regulate the voltage either ■ Complex diagnostics using a feedback signal from B pin or from S pin ■ Thermal shutdown at 175 °C depending on application needs. S pin is intended to have a clear direct connection with the positive Description terminal of the car battery. If this connection gets lost the device will regulate voltage using B pin The L9409 is a monolithic multifunction alternator giving a