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LM1949 - LM1949 Injector Drive Controller

General Description

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 severa

Key Features

  • Y Y Y Y Y Y Y Y Y Y Y Y Y Low voltage supply (3V.
  • 5 5V) 22 mA output drive current No RFI radiation Adaptable to all injector current levels Highly accurate operation TTL CMOS compatible input logic levels Short circuit protection High impedance input Externally set holding current IH Internally set peak current (4 c IH) Externally set time-out Can be modified for full switching operation Available in plastic 8-pin miniDIP.

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LM1949 Injector Drive Controller February 1995 LM1949 Injector Drive Controller General Description 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 (Figure 3–Figure 7) This guarantees opening of the injector The current is then automatically reduced to the sufficient holding level for the