STMICROELECTRONICS L9448VB

L9444VB/L9448VB
L9480VB
ONE CHIP CAR ALTERNATOR REGULATOR
ADVANCE DATA
NO EXTERNAL COMPONENTS
PRECISE TEMPERATURE COEFFICIENT
PRECISE REGULATED VOLTAGE
HIGH OUTPUT CURRENT
SHORT CIRCUIT PROTECTED
REVERSE BATTERY PROTECTION
+ 80 V LOAD DUMP PROTECTION
LOW ENERGY SPIKE PROTECTION
THERMAL SHUTDOWN
VERY LOW START UP VOLTAGE
DESCRIPTION
The devices are a ”single function” self-oscillating
voltage regulator for car alternators. Integrating
both the control section and the output power
TO220
ORDERING NUMBER: L9444VB
L9448VB
L9480VB
stage on a single chip, the devices require no external components, reducing significantly the cost
of the system and increasing reliability.
BLOCK DIAGRAM
October 1992
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This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
L9444VB -L9448VB - L9480VB
ABSOLUTE MAXIMUM RATINGS
Symbol
VS
Iclamp
Iout
Tj , Tstg
Value
Unit
Transient Overvoltage :
Load Dump : 5ms ≤ Trise ≤ 10ms,
τf Fall Time Constant ≤ 100ms, Rsource ≥ 0.5Ω
Parameter
80
V
Current into Low Energy Clamping Zener
(Trise = 5µs ; Tdecay ≤ 2ms ; duty cycle ≤ 5%)
100
mA
Maximum Output Current
5.5
A
– 55 to + 150
°C
Junction and Storage Temperature Range
THERMAL DATA
Symbol
Rth i-case
Parameter
Thermal Resistance Junction-case
Max.
Value
Unit
3
°C/W
PIN CONNECTION (top view)
DEVICE OPERATION
The alternator voltage, rectified by the auxiliary diode trio, is compared with an external reference
and the resulting signal switches the output stage,
driving the alternator field coil.
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.
Anyway an external capacitor (0.1 - 1µF) must be
inserted between VS and Ground guaranteeing
the correct behaviour of the device when the rectifying diodes feature very high switching spikes
that are not filtered by the devices.
This external capacitor must also be used when
the impedances of the cables connecting the al2/5
ternator to the battery are so high to cause a superimposed ripple on the alternator voltage higher
than 3-4V.
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
nominal value @ 25°C.
The devices have an unique -and patented- system to compensate the self-heating of the die due
to the power dissipated in the output stage. In this
way the internal reference voltage tracks the case
temperature rather than the die one.
The device can withstand the reverse battery and
the load dump (up to 80V) ; They can absorb, 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 unless otherwise noted)
Symbol
Vr
Parameter
Regulation Voltage
Test Conditions
Tj = –40°C
for L9444VB
for L9448VB
for L9480VB
Tj = 25°C
Tj = 125°C
CT
Temperature Coeff. of the
Regulation Voltage
eCT
Error on Nominal Temperature
Coeff.
for L9444VB
for L9448VB
for L9480VB
Min.
Typ.
Max.
Unit
14.49
14.36
14.75
14.79
14.66
15.05
15.05
14.96
15.35
V
V
V
14.10
14.40
14.70
V
13.50
13.70
13.10
13.80
14.00
13.40
14.10
14.30
13.70
V
V
V
for L9444VB
for L9448VB
for L9480VB
-6
-4
- 10
mV/°C
mV/°C
mV/°C
± 30
%
250
mV
Vr
Load Regualtion
0.1 In < Ialt < 0.9 In
(note 1)
Vsu
Control Circuit Minimum Start
up Voltage
Measured at Supply Pin
Vsd
Shutdown Voltage (dump
protection threshold)
Vsat 1
Output Saturation Voltage
Ifield = 4 Ap
1.2
2
V
Vsat 2
Start Up Saturation Voltage
Ifield = 200 mA
0.7
1
V
2
22
Iq
Quiescent Current
Field Off
20
Is
Supply Current
Ifield = 4 Ap
50
Ifs
Field Pin Sink Current
Field Off
Field Pin @ 16 V
Low Energy Clamping Zener
Voltage
Iclamp = 50 mA
Switching Frequency
01 In < Ialt < 0.9 In
V1 CLAMP
fsw
3
V
mA
mA
5
120
30
V
mA
V
1000
Hz
Note1: measured on an alternator with the following characteristics: In =<90A; Ialt/Ifield >= 23
APPLICATION CIRCUIT
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L9444VB -L9448VB - L9480VB
TO220 PACKAGE MECHANICAL DATA
mm
DIM.
MIN.
TYP.
A
MAX.
MIN.
TYP.
4.8
C
MAX.
0.189
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
G
4.95
5.21
0.195
5.08
H2
H3
0.055
0.200
10.4
10.05
L2
4/5
inch
10.4
0.409
0.396
16.2
26.7
0.205
0.409
0.638
L3
26.3
27.1
1.035
L5
2.6
3
0.102
1.051
0.118
1.067
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
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 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 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 written approval of SGS-THOMSON Microelectronics.
 1994 SGS-THOMSON Microelectronics - All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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