Injector Drive Controller

The LM1949 linear integrated circuit serves as an excellent control of fuel injector drive circuitry in modern automotive systems. The IC is designed to control an external power NPN Darlington Transistor that drives the high current injector solenoid. The current required to open a solenoid is several times greater than the current necessary to merely hold it open; therefore, the LM1949 by directly sensing the actual solenoid current, initially saturates the driver until the "peak" injector current is four times that of the idle or "holding" current (-). This guarantees opening of the injector. The current is then automatically reduced to the sufficient holding level for the duration of the input pulse. In this way, the total power consumed by the system is dramatically reduced. Also, a higher degree of correlation of fuel to the input voltage pulse (or duty cycle) is achieved, since opening and closing delays of the solenoid will be reduced.
Normally powered from a 5V 10% supply, the IC is typically operable over the entire temperature range (-55C to +125C ambient) with supplies as low as 3 volts. This is particularly useful under "cold crank" conditions when the battery voltage may drop low enough to deregulate the 5-volt power supply.
The LM1949 is available in the plastic miniDIP, (contact factory for other package options).
By National Semiconductor Corporation
Part Manufacturer Description Datasheet Samples
LM1949N/NOPB Texas Instruments Injector Drive Controller 8-PDIP -55 to 125
LM1949N Texas Instruments 0.022A BUF OR INV BASED PRPHL DRVR, PDIP8, MINI, PLASTIC, DIP-8
LM1949 's PackagesLM1949 's pdf datasheet
LM1949N DIP
LM1949-MDC




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LM1949 Application circuits
LM1949 circuits
This is one application circuit of LM1949,If you need more circuits,please download LM1949's pdf datasheet.


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