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L9915

STMicroelectronics
Part Number L9915
Manufacturer STMicroelectronics
Description C-terminal alternator voltage regulator
Published Jun 26, 2023
Detailed Description L9915 C-terminal alternator voltage regulator (CTAVR) Datasheet - production data '!0'03 Multiwatt8 Features  F...
Datasheet PDF File L9915 PDF File

L9915
L9915

Overview
L9915 C-terminal alternator voltage regulator (CTAVR) Datasheet - production data '!0'03 Multiwatt8 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 The device 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 Self start frequency threshold High frequency threshold to exit prexcitation option Freq.
threshold to exit/enter LRC Temp range, C Package Packing L9915-CB fPSS,1(1) fPHPrex,1(1) fPLRC,1(1) Tj = -40 to +150 Multiwatt8 Tube 1.
Other values for VBITD, fPHPrex, fMsw and VBisp can be possible.
ST reserves the right to decide on a case by case basis.
June 2014 This is information on a product in full production.
DocID026400 Rev 1 1/21 www.
st.
com Contents Contents L9915 1 Functional description .
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5 1.
1 Application schematic .
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