LM1949N ,Injector Drive ControllerFeaturesn Low voltage supply (3V–5.5V)The LM1949 linear integrated circuit serves as an excellentco ..
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LM1949N
Injector Drive Controller
LM1949
Injector Drive Controller
General DescriptionThe LM1949 linear integrated circuit servesasan excellent
controlof fuel injector drive circuitryin modern automotive
systems. TheICis designedto controlan external power
NPN Darlington transistor that drivesthe high current injec-
tor solenoid. The current requiredto opena solenoidis
several times greater than the current necessaryto merely
holdit open; therefore, the LM1949,by directly sensing the
actual solenoid current, initially saturates the driver until the
“peak” injector currentis four times thatofthe idleor “hold-
ing” current (Figure 3–Figure7). This guarantees openingof
the injector. The currentis then automatically reducedtothe
sufficient holding levelfor the durationof the input pulse.In
this way,the total power consumedbythe systemis dramati-
cally reduced. Also,a higher degreeof correlationof fuelto
the input voltage pulse(or duty cycle)is achieved, since
opening and closing delaysof the solenoidwillbe reduced.
Normally powered froma5V± 10% supply, theICis typi-
cally operable over the entire temperature range (−55˚Cto
+125˚C ambient) with suppliesas lowas3 volts. Thisis
particularly useful under “cold crank” conditions when the
battery voltage may drop low enoughto deregulatethe 5-volt
power supply.
The LM1949is availablein the plastic miniDIP, (contact
factoryfor other package options).
Features Low voltage supply (3V–5.5V)22 mA output drive current No RFI radiation Adaptabletoall injector current levels Highly accurate operation TTL/CMOS compatible input logic levels Short circuit protection High impedance input Externallyset holding current,IH Internallyset peak current(4xIH) Externallyset time-out Canbe modifiedforfull switching operation Availablein plastic 8-pin minDIP
Applications Fuel injection Throttle body injection Solenoid controlsAir and fluid valves DC motor drives
Typical Application CircuitOrder Number LM1949Mor LM1949N
See NS Package Number M08Aor N08E
FIGURE1. Typical Application and Test Circuit
February 1995
LM1949
Injector
Drive
Controller
