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Features
High side field driver
Thermal protection
Field driver short circuit protection
RVC interface
Overvoltage protection
Complex diagnostics
Load Response Control
Figure 1. Package
Multiwatt8
2
Description
Table 1. Order Codes
Part Number
L9474
Package
Multiwatt8
The L9474 is a monolithic multifunction generator
Voltage regulator intended for use in automotive ap-
plications.
This device regulates the output of an automotive
generator by controlling the field winding current by
means of a variable frequency PWM high side driver.
Figure 2. Schematic Diagram
The setpoint voltage reference is selected by the EN-
GINE CONTROL UNIT via RVC protocol.
TO ECM
L
V
GO
STARTER
F
M
F+
TO BCM
TO ECM
ASVR
P
STATOR
BATTERY
FIELD
(ROTOR)
G
FILTER
82nF
RECTIFIER
BRIDGE
D02AT508
LOADS
March 2005
Rev. 1
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