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LM1949M Folha de dados(PDF) 1 Page - National Semiconductor (TI) |
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LM1949M Folha de dados(HTML) 1 Page - National Semiconductor (TI) |
1 / 10 page TLH5062 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 injec- tor solenoid The current required to open a solenoid is sev- eral times greater than the current necessary to merely hold it open therefore the LM1949 by directly sensing the actu- al solenoid current initially saturates the driver until the ‘‘peak’’ injector current is four times that of the idle or ‘‘hold- ing’’ current (Figure 3 – Figure 7) 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 g10% supply the IC is typi- cally operable over the entire temperature range (b55 Cto a 125 C 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 fac- tory for other package options) Features Y Low voltage supply (3V – 55V) Y 22 mA output drive current Y No RFI radiation Y Adaptable to all injector current levels Y Highly accurate operation Y TTLCMOS compatible input logic levels Y Short circuit protection Y High impedance input Y Externally set holding current IH Y Internally set peak current (4 c IH) Y Externally set time-out Y Can be modified for full switching operation Y Available in plastic 8-pin miniDIP Applications Y Fuel injection Y Throttle body injection Y Solenoid controls Y Air and fluid valves Y DC motor drives Typical Application Circuit TLH5062 – 1 FIGURE 1 Typical Application and Test Circuit Order Number LM1949M or LM1949N See NS Package Number M08A or N08E COPSTM is a trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation RRD-B30M115Printed in U S A |
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