ONE CHIP CAR ALTERNATOR REGULATOR
NO EXTERNALCOMPONENTS
PRECISETEMPERATURE COEFFICIENT
PRECISEREGULATEDVOLTAGE
HIGHOUTPUT CURRENT
SHORTCIRCUIT PROTECTED
REVERSEBATTERYPROTECTION
+ 80 V LOAD DUMP PROTECTION
LOW ENERGY SPIKEPROTECTION
THERMAL SHUTDOWN
VERYLOW START UP VOLTAGE
DESCRIPTION
The devices are a ”singlefunction” self-oscillating
voltage regulator for car alternators. Integrating
both the control section and the output power
L9444VB/L9448VB
L9480VB
ADVANCE DATA
TO220
ORDERING NUMBER: L9444VB
L9448VB
L9480VB
stage on a single chip, the devices require no external components, reducing significantlythe cost
of the systemand increasingreliability.
BLOCK DIAGRAM
October1992
This isadvanced informationon a new product now in development or undergoing evaluation. Details are subjectto change without notice.
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L9444VB -L9448VB - L9480VB
ABSOLUTE MAXIMUMRATINGS
Symbol Parameter Value Unit
V
S
I
clamp
I
out
T
j,Tstg
THERMAL DATA
Symbol Parameter Value Unit
R
th i-case
PIN CONNECTION (top view)
Transient Overvoltage :
Load Dump : 5ms ≤ T
Fall Time Constant ≤ 100ms, R
τ
f
Current into Low Energy Clamping Zener
=5µs;T
(T
rise
Maximum Output Current 5.5 A
Junction and Storage Temperature Range – 55 to + 150 °C
Thermal Resistance Junction-case Max. 3 °C/W
decay
≤ 10ms,
rise
≤ 2ms ; duty cycle ≤ 5%)
source
≥ 0.5Ω
80 V
100 mA
DEVICE OPERATION
The alternatorvoltage, rectifiedby the auxiliarydiode trio, is compared with an external reference
and the resulting signalswitches the outputstage,
drivingthe alternator fieldcoil.
As the regulator is a self-oscillating type, the
switching frequency depends on the whole system parameter set (including the alternator characteristics).
The regulator has an integrated filter in the voltage sensing path. Consequently it doesn’t need in the standard application- any external component.
Anywayan external capacitor (0.1 - 1µF) must be
inserted between V
and Ground guaranteeing
S
the correct behaviour of the device when the rectifying diodes feature very high switching spikes
that are not filteredby the devices.
This external capacitor must also be used when
the impedances of the cables connecting the al-
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ternator to the battery are so high to cause a superimposedripple on thealternatorvoltage higher
than3-4V.
The devices regulation voltage and the temperature coefficient may be independently set by
suited metal mask selections ; furthermore the
regulation voltage is trimmed within ± 1% of the
nominalvalue @25°C.
The devices have an unique -and patented- system to compensatethe self-heatingof the die due
to the power dissipated in the output stage. In this
way the internal referencevoltagetracks the case
temperaturerather than the die one.
Thedevice can withstand the reverse battery and
the load dump (up to 80V) ; They canabsorb,into
the internal clamping zeners, low energy spikes
up to a level of 100mA and its output is short circuit protected.
Finally the internal thermal shutdown avoids any
possible device damage due to overtemperature
problems.
L9444VB - L9448VB- L9480VB
ELECTRICAL CHARACTERISTICS (– 40 °C ≤ TJ≤ 125 °C unlessotherwise noted)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
r
C
T
eC
V
r
V
su
V
sd
V
sat 1
V
sat 2
I
q
I
s
I
fs
V
1 CLAMP
f
sw
Note1: measuredon an alternator with the following characteristics: In=<90A;I
Regulation Voltage Tj= –40°C for L9444VB
=25°C 14.10 14.40 14.70 V
T
j
= 125°C for L9444VB
T
j
Temperature Coeff. of the
Regulation Voltage
for L9444VB
for L9448VB
for L9480VB
Error on Nominal Temperature
T
Coeff.
Load Regualtion 0.1 In<I
(note 1)
Control Circuit Minimum Start
Measured at Supply Pin 2 3 V
alt
for L9448VB
for L9480VB
for L9448VB
for L9480VB
< 0.9 I
n
14.49
14.36
14.75
13.50
13.70
13.10
14.79
14.66
15.05
13.80
14.00
13.40
-6
-4
-10
± 30 %
250 mV
up Voltage
Shutdown Voltage (dump
22 V
protection threshold)
Output Saturation Voltage I
Start Up Saturation Voltage I
=4A
field
field
p
= 200 mA 0.7 1 V
1.2 2 V
Quiescent Current Field Off 20 mA
Supply Current I
field
=4A
p
50 mA
Field Pin Sink Current Field Off
Field Pin @ 16 V
Low Energy ClampingZener
Voltage
Switching Frequency 01 In<I
I
= 50 mA 120 V
clamp
alt
< 0.9 I
n
alt/Ifield
>=23
30 1000 Hz
15.05
14.96
15.35
14.10
14.30
13.70
5mA
V
V
V
V
V
V
mV/°C
mV/°C
mV/°C
APPLICATIONCIRCUIT
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L9444VB -L9448VB - L9480VB
TO220PACKAGE MECHANICAL DATA
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
A 4.8 0.189
C 1.37 0.054
D 2.4 2.8 0.094 0.110
D1 1.2 1.35 0.047 0.053
E 0.35 0.55 0.014 0.022
F 0.8 1.05 0.031 0.041
F2 1.15 1.4 0.045 0.055
G 4.95 5.08 5.21 0.195 0.200 0.205
H2 10.4 0.409
H3 10.05 10.4 0.396 0.409
L2 16.2 0.638
L3 26.3 26.7 27.1 1.035 1.051 1.067
L5 2.6 3 0.102 0.118
L6 15.1 15.8 0.594 0.622
L7 6 6.6 0.236 0.260
Dia 3.65 3.85 0.144 0.152
mm inch
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L9444VB - L9448VB- L9480VB
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such informationnor for any infringement ofpatents or otherrights of third parties which may resultfrom its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express writtenapproval of SGS-THOMSONMicroelectronics.
1994 SGS-THOMSON Microelectronics - All RightsReserved
SGS-THOMSON Microelectronics GROUPOF COMPANIES
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