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 Help - control pulse width of a -15vdc pulse train

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MARK KILBURN Posted - Jan 22 2011 : 8:51:40 PM
how to control pulse width of a -15vdc pulse train @ 20khz
Help needed to control the pulse width of a (negative) -15vdc pulse train at 20khz..

Basically, the pulse is as described in the picture attached which is of the pulse itself all details are within picture.


I will not need to vary the frequency only the pw..
I would like to use something very simple... I have been searching everywhere.

However, most designs are base on negative going pulses on a +dc supply and not on a wave form that actually goes positive from a negative -15vdc supply.....

please idea's would be great appreciated.
Ps: The pulse train controls a fet driven NEG Dc chopper circuit (high current)

Thanks to all who take the time to at least read this post.


(Edit...Fix images)
2   L A T E S T    R E P L I E S    (Newest First)
maxwell Posted - Feb 12 2011 : 4:54:37 PM
There are multiple ways to skin this cat (as always). I assume you would like to go the easiest and simplest route. What is the range of pulse widths that you want to generate? Do you need to control over the entire range of 0 to 50 microseconds? Do you want to control it continuously? or in steps? If it can be in steps, what are the constraints on step size?
Gus B Posted - Feb 09 2011 : 07:59:35 AM
Sounds to me like you want a regular PWM circuit that is referenced to -15V instead of GND.

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