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PDF L9407F Data sheet ( Hoja de datos )
| Número de pieza | L9407F | |
| Descripción | CAR ALTERNATOR VOLTAGE REGULATOR | |
| Fabricantes | STMicroelectronics | |
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L9407F
CAR ALTERNATOR VOLTAGE REGULATOR
PRODUCT PREVIEW
s FULLY MONOLITHIC DESIGN
s LOW SIDE FIELD DRIVER
s THERMAL PROTECTION
s FIELD SHORT CIRCUIT PROTECTION
s PROTECTED DIAGNOSTIC LAMP DRIVER
s PROTECTED HIGH SIDE RELAY DRIVER
s COMPLEX DIAGNOSTICS
s LOAD RESPONSE CONTROL
s DFM OUTPUT (FIELD MONITOR)
Multiwatt 8
ORDERING NUMBER: L9407F
DESCRIPTION
The L9407F is a monolithic multifunction alternator
voltage regulator intended for use in automotive ap-
plication. It includes the control section, the field pow-
er stage, fault diagnostic circuit which drives a
warning lamp, and the protection against short cir-
cuits.
CIRCUIT OPERATION
The alternator's voltage regulator performs the fol-
lowing main functions:
– 1) voltage regulation
– 2) protection
– 3) control fault diagnosis
– 4) load response control
VOLTAGE REGULATION
The alternator voltage is compared with a reference
voltage in an amplifier, whose output determines the
switching frequency of output power MOS whose
current excites the coil of the alternator; as the regu-
lators are a self-oscillating type this frequency de-
pends on the whole system parameter set including
the alternator characteristics. The regulators have an
integrated filter in the voltage sensing path guaran-
teeing the correct behaviour of the devices also when
the rectifier diodes feature very high switching
spikes. The internal filtering allows the usage of the
device also with very long cables connecting the al-
ternator to the battery with an impedance so high to
cause a superimposed ripple on the alternator volt-
age higher than 5-6V. Consequently it doesn't need,
in the standard application, any external component.
Anyway an external application (2.2uF or 2.7uF)
must be inserted between A+ and ground when using
the device with very long cables.
PROTECTION
It is present a protection against short circuits of the
lamp and the relay power drivers (D+) and of the field
power driver (DF), a thermal drivers shutdown pro-
tection and an overvoltage protection of D+ power
drivers.
DIAGNOSIS
The circuit detects fault conditions related to the
phase and DF status and receives informations from
one of the three alternator phases. In order to prevent
spurious indications, fault warnings are not displayed
immediately but are dalayed by a fixed time.
LOAD RESPONSE CONTROL
The internal circuit regulates the soft start character-
istics (activated always at engine start) and the soft
attack characteristics.
February 2003
This is preliminary information on a new product now in development. Details are subject to change without notice.
1/11
1 page  
L9407F
ELECTRICAL CHARACTERISTCS (continued)
(Tcase = -40ºC ÷ 150ºC; unless otherwise specified)
Symbol
Parameter
Test Condition
Min. Typ. Max Unit
EN Soft start enable frequency Tcase = 25ºC
range
Tcase = -40 to150ºC
144 160
136 160
176
184
Hz
Hz
f_RESS_SS Reset frequency range to
enable soft start
40 50 60 Hz
DISAB Soft start enable frequency
range
Tcase = 25ºC
Tcase = -40 to150ºC
367 408
347 408
449
469
Hz
Hz
f-dfm
Output open drain switching
freq.
preexc. mode; Isink=14mA
30
400 Hz
VL-DF- Output low voltage saturation I-sink=14mA
MON
1.5 V
I-DF-MON Short circuit current protection V-DF-MON=24V field fully on
15
120 mA
Ilk-DF- Output leakage current
MON
V-DF-MON=24V field off
0.1 mA
t-TM Output voltage rise time
R=2.7K Ohm; C=1nF;
Valim=13.5V (Fig. 6)
0.05
50 us
t-TD Output voltage fall time
R=2.7K Ohm; C=1nF;
Valim=13.5V (Fig. 6)
0.05
50 us
t-D Diagnostic Alarm Delay Time
0.15 0.5 s
Figure 1. DF Monitor Electrical configuration
L9407F
Alternator
Field
A+
DF
Control
Circuit
Field driver
Regulator assy
Valim
DF_MON
to the ECU
R
C
DFMon driver
Test circuit
5/11
5 Page 
L9407F
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted
by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
STMicroelectronics acknowledges the trademarks of all companies referred to in this document.
The ST logo is a registered trademark of STMicroelectronics
© 2003 STMicroelectronics - All Rights Reserved
STMicroelectronics GROUP OF COMPANIES
Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan -Malaysia - Malta - Morocco -
Singapore - Spain - Sweden - Switzerland - United Kingdom - United States.
http://www.st.com
11/11
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| PDF Descargar | [ Datasheet L9407F.PDF ] | |
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