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From: "Christopher R. Carlen"
Subject: Re: How to drive a solenoid fuel injector?
Date: Fri, 20 Dec 2002 16:37:02 -0800
Organization: Sandia National Laboratories, Albuquerque, NM USA
NNTP-Posting-Date: Fri, 20 Dec 2002 23:35:56 +0000 (UTC)
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> How about something like this???
> 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.
Thanks for the info. Even if I don't use that thing, the datasheet made
me realize more about how to do this than I knew before.
I don't need a bipolar current source at all. Now I see what a zener
diode is good for in clamping an inductor on flyback, it allows one to
generate a faster di/dt when the drive is shut off compared to a plain
Christopher R. Carlen
Principal Laser/Optical Technologist
Sandia National Laboratories CA USA
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