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L9915B Datasheet(PDF) 1 Page - STMicroelectronics |
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L9915B Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 20 page  This is information on a product in full production. February 2015 DocID027541 Rev 1 1/20 L9915B C-terminal alternator voltage regulator (CTAVR) Datasheet - production data Features Fully monolithic design High side field driver Field short circuit protection Regulated voltage driven by ECU (protocol driven) Regulated voltage thermally compensated (without protocol) Lamp driver (wake up and warning detection) Self start function Load response control (LRC) Field monitor (FM) output Thermal shutdown Description L9915B is a monolithic alternator voltage regulator intended for use in automotive application. It 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). Table 1. Device summary Order code Internal thermal drift option High frequency threshold to exit prexcitation option Temp range, C Package Packing L9915B VBITD fPHPrex Tj = -40 to +150 Multiwatt8 Tube www.st.com |
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