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PDF L9474 Data sheet ( Hoja de datos )
| Número de pieza | L9474 | |
| Descripción | CAR SILICON VOLTAGE REGULATOR | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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L9474www.DataSheet4U.com
ALL SILICON VOLTAGE REGULATOR
1 Features
■ High side field driver
■ Thermal protection
■ Field driver short circuit protection
■ RVC interface
■ Overvoltage protection
■ Complex diagnostics
■ Load Response Control
2 Description
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
Figure 1. Package
Multiwatt8
Table 1. Order Codes
Part Number
L9474
Package
Multiwatt8
The setpoint voltage reference is selected by the EN-
GINE CONTROL UNIT via RVC protocol.
TO ECM
L
TO ECM
FM
F+
FIELD
(ROTOR)
ASVR
G
VGO
P
FILTER
C
82nF
STARTER
TO BCM
BATTERY
STATOR
LOADS
RECTIFIER
BRIDGE
D02AT508
March 2005
Rev. 1
1/8
1 page  
L9474
Table 8. Regulation Features
Symbol
Parameter
Test Condition
www.DataSheet4U.com
Min. Typ. Max. Unit
VLON Lamp term turn on 5 threshold fL = 128Hz +/-5%
0.65
0.9
1.15
V
ILON
VL = 0.65V
0.3 1.5 mA
VP1 Initiation of regulation detection IP = 1mA (sinking current)
phase voltage threshold 6
0.35 V
VP2 Fault detection phase voltage
threshold 7
78 9 V
IP Sinking current @ P terminal
VP = 1.5V
0.5 1 1.8 mA
fIFR Initiation of field regulation
frequency
72 Hz
FSDF Field Strobe Duty Factor
@ "power up" with fPHASE < fIFR
12.5
%
LRC Load Response Control rate 8
2.125 2.5 2.875
s
fLRC LRC transition frequency
LRC disabled above this value 263 310 357
Hz
∆gnd Difference between ECM &
Alternator ground
-0.2 0.2 V
Notes:
5. A 128Hz PWM signal applied to L input, higher than this threshold, will turn on the device.
6. This threshold on the phase signal is used to detect the phase frequency, fIFR, for the Initiation of field regulation.
7. This threshold on the phase signal is used to sense the presence of the phase for fault detection purposes. Furthermore, to prevent
the loss of phase signal, a 31.25% duty cycle is applied to field output when phase drops below Vp2 and Vgo is above setpoint.
8. This is the time duration the L9474 takes to rump up from 0 % to 100% duty cycle in response to an increased load on the gen-
erator. The LRC ratio is set 1:4 and the Vreg comparator status is latched at foundamental frequency rate.
5/8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet L9474.PDF ] | |
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