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PDF L9911 Data sheet ( Hoja de datos )
| Número de pieza | L9911 | |
| Descripción | CAR ALTERNATOR MULTIFUNCTION SMART VOLTAGE REGULATOR | |
| Fabricantes | ST Microelectronics | |
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L9911
CAR ALTERNATOR MULTIFUNCTION SMART VOLTAGE
REGULATOR
PRELIMINARY DATA
1 Features
■ FULLY MONOLITHIC DESIGN
■ HIGH SIDE FIELD DRIVER
■ THERMAL PROTECTION
■ FIELD SHORT CIRCUIT PROTECTION
■ PROTECTED DIAGNOSTIC LAMP DRIVER
■ PROTECTED HIGH SIDE RELAY DRIVER
■ COMPLEX DIAGNOSTICS
■ LOAD RESPONSE CONTROL
■ DFM OUTPUT (FIELD MONITOR)
2 Description
The L9911 is a monolithic multifunction 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 cir-
cuits.
3 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
Figure 1. Package
Multiwatt8
Table 1. Order Codes
Part Number
L9911A
L9911B
Package
Multiwatt8
Multiwatt8
Features
See Table.9
See Table.9
ance so high to cause a superimposed ripple on
the alternator voltage higher than 5-6V. Conse-
quently it doesn't need, in the standard applica-
tion, any external component. Anyway an external
capacitor (2.2µF) must be inserted between A+
and ground when using the device with very long
cables.
3.2 PROTECTION
It is present a protection against short circuits of
the lamp and the relay power drivers (L) and of the
field power driver (F+), a thermal drivers shutdown
protection and an overvoltage protection of L pow-
er drivers.
3.1 VOLTAGE REGULATION
The alternator voltage is compared with a refer-
ence voltage in an amplifier, whose output deter-
mines the switching frequency of output power
MOS whose current excites the coil of the alterna-
tor; as the regulator is in fixed-frequency topology,
the field switching frequency does not depend on
the alternator characteristics. The regulators have
an integrated filter in the voltage sensing path
guaranteeing the correct behaviour of the devices
also when the rectifier diodes feature very high
suwsaitgcehwionwfgthwsep.idDkeeavsit.caeTShaelhsoeinweteittr4hnUavle.rfciyltoelomrninggcaalblolewsscothne-
necting the alternator to the battery with an imped-
3.3 DIAGNOSIS
The circuit detects fault conditions related to the
phase and F+ 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.
3.4 LOAD RESPONSE CONTROL
The internal circuit regulates the soft start charac-
teristics (activated always at engine start) and the
soft attack characteristics.
November 2005
Rev. 3
1/15
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
1 page  
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L9911
Table 6. Load Response Control Parameters
Symbol
t_ST_1
t_ST_2
t_SL_1
t_SL_2
EN-RES
(constant)
EN-1
EN-2
EN-3
EN-4
DISAB-1
DISAB-2
DISAB-3
DISAB-4
Parameter
Soft Start Delay Time (Fig.
13) 2 steps available,
selectable by mask option
(see Table.7).
Soft Attack Time / Soft Start
Time (Fig. 13). 2 steps
available, selectable by mask
option (see Table 7).
Reset frequency range to
enable regulation; Frequency
judged after 4 periods (Fig.
12)
Soft start enable (EN) and
LRC disable (DISAB)
frequency ranges.
4 configurations available,
selectable by mask option
(possible combinations in
Table 8). Always activated at
engine start. Frequencies
judged after 4 periods (Fig.
12)
Test Condition
Activated always at engine start
From 0 to 100% field duty cycle
Tj = 25ºC
Tj = -40 to150ºC
Tj = 25ºC
Tj = -40 to150ºC
Tj = 25ºC
Tj= -40 to150ºC
Tj = 25ºC
Tj = -40 to150ºC
Tj = 25ºC
Tj = -40 to150ºC
Tj = 25ºC
Tj = -40 to150ºC
Tj = 25ºC
Tj = -40 to150ºC
Tj = 25ºC
Tj = -40 to150ºC
Min.
1.73
Typ.
0
2
Max.
2.35
Unit
s
2.13
7.65
2.5 2.87
9 10.35
s
40 50 60 Hz
108 120 132
102 120 138
Hz
Hz
131 145 159
124 145 166
Hz
Hz
144 160 176
136 160 184
Hz
Hz
174 193 212
165 193 221
Hz
Hz
270 300 330
255 300 345
Hz
Hz
315 350 385
298 350 402
Hz
Hz
367 408 449
347 408 469
Hz
Hz
420 466 512
397 466 535
Hz
Hz
Table 7. Load Response Control Timing Options
t_ST = 0s
t_ST = 2s
t_SL = 2.5s
LRC-A
LRC-C
t_SL = 9s
LRC-D
LRC-B
Table 8. Correspondence of Frequency (typical values) to Application Features
Alternator Revolution Speed (rpm)
6 Pole Pairs
8 Pole Pairs
Typical Configuration Initiate Regulation
A (Config-A)
LRC Cut
1200
3000
EN-1
DISAB-1
EN-3
DISAB-3
Typical Configuration Initiate Regulation
B (Config-B)
LRC Cut
1450
3000
EN-2
DISAB-1
EN-4
DISAB-3
Typical Configuration Initiate Regulation
C (Config-C)
LRC Cut
1450
3500
EN-2
DISAB-2
EN-4
EN-4
Considering the overall WW application scenario, there is a direct correspondence between Typical Con-
figurations A/B and regulation curve Vreg-1, and between Typical Configuration C and regulation curves
Vreg-2 and Vreg-3. This is allowing the summary of all possible customizations for L9911 in the table be-
low. www.DataSheet4U.com
5/15
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Figure 13. Soft Start/attack Characteristics
Engine off
Ign. Switch off
on
W/Lamp off
on
on
t_ST
t_SL
Ifield
F+/DFM
Field Pre-
excitation
Field
Regulation
Load ON
L9911
Table 10. Fault Detection
Root Cause
Signal
Effect
Test detect
Alternator belt breaking
P Alternator disexcitation VP<VPHH1 & VB+<Vreg
Brushes open
P Alternator disexcitation VP<VPHH1 & VB+<Vreg
Field Driver Open
P Alternator disexcitation VP<VPHH1 & VB+<Vreg
Field interruption
P Alternator disexcitation VP<VPHH1 & VB+<Vreg
Field short circuit to the battery
F+ Overvoltage
VF+>VS1 & VB+ > Vov-d
Field short circuit to the ground
P Alternator disexcitation VP<VPHH1 & VB+<Vreg
Battery discharge
B+ Undervoltage
VB+<Vuv
The diagnostic result is disabled during the Soft-start delay time t_ST 0...3 and the soft-start / soft attack timing t_SL 0...3
Figure 14. DFMonitor Electrical configuration
L9911
B+
Alternator
Field
F+
Control
Circuit
Field driver
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Regulator assy
Valim
R
DFM
to the ECU
DFMon driver
Test circuit
11/15
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