[Diy_efi] peak-and-hold injector driver ic's

[Bevan Weiss]

> my advice would be to stop worrying about current limitng and just
overbuild
> the circut. if you have a peak load of say 1.1amps per injector and are
> firing one injector just go ahead and build the circut with a 4amp driver.
> the injector wont overheat. what the issue is is with driving the gate. if
> your using an oem ecm to drive the gate then just forget about current
> limitng. no real point to it.

If I allow 4amps to pass through an injector for it's entire on time, then
there is every likelyhod that it will melt.  I don't know of any injector
that can take a constant 4amp current flow without getting mighty damn hot,
and eventually failing.

What I want to do is turn the injector on as fast as possible, then lower
the current to it's minimum possible on value.  This way the design uses the
least possible power, and also has the best possible response time.

As for how the injector will be driven it will be a simple 2.5V CMOS on/off.
I want the current limiting to be built into the actual driver itself, not
the controller.  The controller is going to be of my own design.

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