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On board IGBT ignition drivers On board low Z injector drivers Thermistor self heating prevention :-p NO thermistor self heating prevention Current feedback circuitry on injectors NO current feedback circuitry on injectors ONLY SMD components ONLY TH components SMD components supported TH component...

Isn't this the case for yours too? IE current limit *should* be adjusted per injector set? and time coefficient can/should be adjusted per injector set too? I realise that because of the current limit you can just have it too long always and limited to 4A during that period, but optimally you would...

Definitely will work - several down sides tho you need to adjust the pulse length for different injector inductance/resistance vaules you need to adjust the resistor for different injector values the resistor needs to be 10W minimum and probably needs to be 15W to be safe. I personally don't think a...

Correct, I'm not attacking anyone or anything. I'm just saying what I see when I look at the circuit diagram. I've found that spice apps are generally not all that good at estimating component temperature. In my experience it's good to get a second view on whatever problem I'm solving, even if the ...

So I suppose the pertinent question is - do you think it works or not.

http://i33.tinypic.com/2hzpoww.jpg Top pic - gate voltage - you can see it sits near the threshold voltage and pulses up to turn on when its limiting current. 2nd pic - Pink is C1 voltage. Red is Vdrain you can see it turns on and off while limiting. 3rd pic - Vsource - voltage value closely mirror...

My design does all of this and only requires one output pin - did you read through the whole thread??? I did not read through the whole thread before, Fred just asked that I posted my opinion on this after we had some discussion on flyback suppression, which I did. No, your design doesn't do all of...

I think you should include the low Z setup - quite frankly its not much extra space, and if you only use high Z injectors then it doesn't go into the switching zone anyway - so it won't make any noise at all for you, and others who need it can test to see if it works or causes crazy problems.

Too strong of a flyback clamp (low voltage) will hurt the injector closing time and reduce precision of the injector control. A weak clamp will hurt the power dissipation of the system during PWM. A strong clamp helps during the PWM period in two ways, with a low voltage drop across the clamp there...

LM7805 != LM78L05 Which one is it?? If its the LM78L05 - then its only rated to supply 100mA 140mA max - so its probably in latch up and out of the supply transistors SOA. If its the LM7805 - then its rated to 1A and this should not be happening - there must be a problem. Quiescent current is the cu...