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L585D1
CAR ALTERNATOR REGULATOR
L585September 2002
CAR ALTERNATOR REGULATOR ALTERNATOR VOLTAGE CONTROL . COMPLETE FAULT DIAGNOSTICS. DRIVES 3 W LAMP DIRECTLY. LAMP SHORT CIRCUIT PROTECTION. SENSING INTERRUPT PROTECTION. 100 V DUMP PROTECTION. 300 V LOW ENERGY SPIKE PROTECTION. THERMAL PROTECTION
DESCRIPTIONThe L585 is an integrated circuit designed for use
with an NPN darlington as a voltage regulator in a
threephase alternator charging system. It includes
fault diagnostic circuitry which drives a 3 W warning
lamp in fault conditions such as open or short circuit
connections. Protection against load dump tran-
sients, short circuits and low energy spikes is incor-
porated.
BLOCK DIAGRAM 1/8
PIN CONNECTION
THERMAL DATA
ABSOLUTE MAXIMUM RATINGS
Note : Soldered on PC board that simulates an application with medium device density on board.
(*) Thermal resistance junction-pins with the chip soldered on the middle of an alumina supporting substrate measuring 15 x 20 mm ; 0.65 mm
thickness and infinite heathsink.
L5852/8
PIN FUNCTIONS
L5853/8
ELECTRICAL CHARACTERISTICS (Vs = 14.4V ; – 30°C ≤ Tj ≤ 100°C unless otherwise specified ; refer toapplication circuit)
REGULATION
DIAGNOSTIC
Notes :1. d = 50 % the duty cycle of the output signal at pin 6. The lamp is switched on with a fixed delay when the alternator voltage becomes higher than VAH. (overcharge indication). Measured 100 ms after turn-on. The lamp is switched on with a fixed delay when the voltage Vp becomes lower than VPL (the alternator is not charging the battery). The lamp is switched on when the cable B is broken (VA - VS becomes higher than VAS). The lamp is switched on when the cable A is broken (IC without power voltage supply). When the voltage at pin 1 is greater than V1 dp the internal darlington of the lamp is switched off.
L5854/8
PROTECTION
Notes :1. d = 50 % the duty cycle of the output signal at pin 6. The lamp is switched on with a fixed delay when the alternator voltage becomes higher than VAH. (overcharge indication). Measured 100 ms after turn-on. The lamp is switched on with a fixed delay when the voltage Vp becomes lower than VPL (the alternator is not charging the battery). The lamp is switched on when the cable B is broken (VA - VS becomes higher than VAS). The lamp is switched on when the cable A is broken (IC without power voltage supply). When the voltage at pin 1 is greater than V1 dp the internal darlington of the lamp is switched off.
CIRCUIT OPERATIONThe L585 alternator regulator performs two main functions : regulation control and fault diagnostics.
REGULATIONThe alternator voltage is compared with a reference
voltage in an error amplifier (see block diagram), the
output of which determines the duty cycle of the ex-
ternal darlington. This darlington switches the cur-
rent in the excitation coil of the alternator.
The switching frequency is fixed and is set by the ex-
ternal capacitor COSC (see application circuit). Ca-
pacitive positive feedback and a monostable elimi-
nates spurious switching caused by contact bounce.
The base current delivered to the external darlington
it set by the resistor RB (see application circuit) and
must be dimensioned according to the charac-
teristics of this darlington and the maximum coil cur-
rent.
DIAGNOSTICThis circuit receives information from the battery, the
alternator and one alternator phase. It indicates
anomolous conditions by driving a 3 W lamp. To pre-
vent spurious fault warnings some indications are
not displayed immediately but are delayed by a fixed
time. No external components are needed to imple-
ment this delay since it is produced internally by di-
viding the internal oscillator with an eight-stage di-
vider to give a delay of 128 periods. For a one sec-
ond delay the oscillator frequency must be 128 Hz.
The lamp is driven after a delay when the following
conditions occur : no charge, break or short circuit
in the alternator sense wire.
The diagnostic lamp is driven immediately when the
cable connecting the alternator to the battery is bro-
ken (Va-Vbatt above 2.6 typ.) or when the IC is with-
out power supply (VCE sat of the lamp driver is 2.4 V
typ. in this case).
ELECTRICAL CHARACTERISTICS (continued)
L5855/8
Figure 1 : Application Circuit.
PROTECTIONSHORT CIRCUIT PROTECTION
The integrated darlington is protected against short
circuits of the lamp. The short circuit current is lim-
ited at 600 mA and if this condition persistes thermal
protection will intervene.
DUMP PROTECTION
The whole IC is protected against load dump tran-
sients (100 V, 300 ms with a rise time greater than
5 ms) in the typical application circuit. The only com-
ponent to which this transient is directly applied (no
series resistances) is the lamp driver darlington.
During transients the darlington is kept off and can
withstand peak voltages of 100 V. Additionally, the
IC can withstand low energy spikes up to 300 V.
These spikes are clamped by an internal 100 V
zener on the collector of the lamp driver darlington.
THERMAL PROTECTION
When the IC temperature reaches 170 °C the lamp
driver darlington is kept off.
The device is able to withstand all the voltage tran-
sients mentioned in ISO DP7637/1. If voltage tran-
sients more severe than the above ISO standard
have to be withstood, an external protection device
(transil) must be connected between pin 15 and
GND. For transients up to 250V, tpulse = 500μs,
Rsource = 47Ω, the transil P6KE100P is recom-
mended.
L5856/8
