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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 BLOCK DIAGRAM
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.
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 Parameter Transient Overvoltage : Load Dump : 5ms Trise 10ms, f Fall Time Constant 100ms, Rsource 0.5 Current into Low Energy Clamping Zener (Trise = 5s ; Tdecay 2ms ; duty cycle 5%) Maximum Output Current Junction and Storage Temperature Range Value 80 Unit V
Iclamp Iout Tj , Tstg
100 5.5 - 55 to + 150
mA A C
THERMAL DATA
Symbol Rth i-case Parameter Thermal Resistance Junction-case Max. Value 3 Unit 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 - 1F) 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 @ 25C. 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 = -40C for L9444VB for L9448VB for L9480VB for L9444VB for L9448VB for L9480VB Min. 14.49 14.36 14.75 14.10 13.50 13.70 13.10 Typ. 14.79 14.66 15.05 14.40 13.80 14.00 13.40 -6 -4 - 10 30 0.1 In < Ialt < 0.9 In (note 1) Measured at Supply Pin 250 2 22 Ifield = 4 Ap Ifield = 200 mA Field Off Ifield = 4 Ap Field Off Field Pin @ 16 V Iclamp = 50 mA 01 In < Ialt < 0.9 In 30 120 1000 1.2 0.7 20 50 5 2 1 3 Max. 15.05 14.96 15.35 14.70 14.10 14.30 13.70 Unit V V V V V V V mV/C mV/C mV/C % mV V V V V mA mA mA V Hz
Tj = 25C Tj = 125C
CT
Temperature Coeff. of the Regulation Voltage Error on Nominal Temperature Coeff. Load Regualtion Control Circuit Minimum Start up Voltage Shutdown Voltage (dump protection threshold) Output Saturation Voltage Start Up Saturation Voltage Quiescent Current Supply Current Field Pin Sink Current Low Energy Clamping Zener Voltage Switching Frequency
for L9444VB for L9448VB for L9480VB
eCT Vr Vsu Vsd Vsat 1 Vsat 2 Iq Is Ifs V1 CLAMP fsw
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
DIM. MIN. A C D D1 E F F2 G H2 H3 L2 L3 L5 L6 L7 Dia 26.3 2.6 15.1 6 3.65 10.05 16.2 26.7 27.1 3 15.8 6.6 3.85 1.035 0.102 0.594 0.236 0.144 2.4 1.2 0.35 0.8 1.15 4.95 5.08 mm TYP. MAX. 4.8 1.37 2.8 1.35 0.55 1.05 1.4 5.21 10.4 10.4 0.396 0.638 1.051 1.067 0.118 0.622 0.260 0.152 0.094 0.047 0.014 0.031 0.045 0.195 0.200 MIN. inch TYP. MAX. 0.189 0.054 0.110 0.053 0.022 0.041 0.055 0.205 0.409 0.409
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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 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. (c) 1994 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands - Singapore Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A.
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