L9686 ,AUTOMOTIVE DIRECTION INDICATORELECTRICAL CHARACTERISTICS (– 20°C < Tamb <, 100°C, 8V < VS < 18V unless otherwise speci-fied.)Symb ..
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L9686
AUTOMOTIVE DIRECTION INDICATOR
L9686AUTOMOTIVE DIRECTION INDICATOR
ADVANCE DATARELAY DRIVER IN CAR DIRECTION
INDICATORS
FLASH FREQUENCY DOUBLES TO INDI-
CATE LAMP FAILURE
DUMP PROTECTION ( ± 80 V)
REVERSE BATTERY PROTECTION
DESCRIPTIONThe L9686 is a two frequency oscillator particu-
larly suitable as relay driver for flashing light con-
trol in automotive applications. The circuit may be
also used for other warning lamps like "handbrake
on" etc. The lamp failure detection is given by
doubling the flash repetition frequency. The
L9686 is supplied in minidip 8-lead and SO8 plas-
tic packages.
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
PIN CONNECTION (Top view)
L9686
FUNCTIONAL DESCRIPTIONThe circuit is designed to drive the direction indi-
cator flasher relay. The application circuit shows
the typical system configuration with the external
components. Its consists of a network (R1 C1) to
determine the oscillator frequency, shunt resistor
(RS) to detect defective bulbs and two current lim-
iting resistors (R2/R3) to protect the IC against
load dump transients.
The lightbulbs L2, L3, L4, L5, are the turn signal in-
dicators with the dashboard-light L6. The S1
switch position is sensed across resistor R2
and Rlamp by input 8. The flashing cycle is started
by closing S1 : then, after a delay time td typically
equal to 1.5 ms, the relay is actuated and the pin
3 goes high switching on the corresponding
lamps L2, L3, (or L4, L5). These lamps will flash at
the oscillator frequency not depending on the bat-
tery voltage value (8 - 18 V). The flashing cycle
stops and the circuit is reset to the initial position
when the switch S1 is open.
The lamp failure detection function senses the
current through the shunt resistor RS. When one
of the lightbulbs is defective the voltage drop
across RS is reduced to a half and the failure is
indicated by doubling the flashing frequency.
ELECTRICAL CHARACTERISTICS (– 20°C < Tamb <, 100°C, 8V < VS < 18V unless otherwise speci-fied.)
Notes :1. This voltage is the threshold used to protect the circuit against overvoltage : if Vbat is > than this threshold, the relay will be on
and the voltage across the circuit will maintain constant increasing the current in the protective resistor R3.
This is the maximum value for operation. This value must be higher than 1 K Ohms in order to limit the current in pin 8 during
dumps. A recommended value for application should be 1,5 K Ohms.
The external leakage from the blinker unit to ground must be with an equivalent resistor higher than 5,6 K Ohms to avoid para-
sitic operation when the switch S1 is off.
This temperature coefficient is usefull to compensate the drift of the external timing network (R1, C1).
This threshold is calculated for a 20 m Ohm shunt. The threshold is dependant of Vbat as the bulb current.
L9686
Figure 1: Application Circuit.
L9686
MINIDIP PACKAGE MECHANICAL DATA
L9686
SO8 PACKAGE MECHANICAL DATA
L9686
