Injector driver question...

[Hugo Villeneuve]

Hi Walt,

	I have not disabled the timer function (because I don't have to) of the
LM1949 because now, for the high impedance injector, the current is always
less than 0.75A (measured on the scope). After 3.9mS, if the current has
not reached 4A, the LM1949 try to adjust the injector current to exactly
1A, by varying the base current of the transistor. But, even when the
transistor is in full conduction, the current of the injector will never be
greater than 12V/14.9 ohms = 0.8A.

	Hugo.



>Glad to hear!   Still wondering about your earlier questions/remarks.
>Disable  the timer function (3.9 ms on NS's L1949 data sheet example) and
>hookup a high impedance injector.  Does the current ever rise above the
>steady state value of .75-.80 A ?  Be curious to know.
>
>Walt.
>