> >My new question:  The input (available) to this driving [FET(s)] circuit
> now
> >is 5 volts rail to rail from the opto-coupler.  This is the stage I need
> >help with.  Perhaps an IRLD110 FET as a intermediary stage between the
opto
> >and the main FET could be used.
> >From the opto coupler's output, can I drive a smaller FET to provide
proper
> >gate drive to the larger FET, then in turn offering 24VDC out.
> >Still require help with the driving circuit for this valve.
>
> I think you will have trouble if you try and use a pull up (or pull down)
> resistor, with a single transistor. Normally a push pull pair of
transistors
> is used, a bit like the output stage of an audio amplifier. The data sheet
> gives a Cgs of 300pF, and a gate charge of 16 to 22nC, which is the item
> that really gets you. I am not an expert on driving these, but have
watched
> "over the shoulder" of colleagues who have.
>
> I would suggest you look at some application notes on the Intersil web
site.
> Search for HIP4080, there is a family of devices where just the last digit
> of the part number varies, and check the application notes for these
parts.
> IIRC there is a reasonable amount of information on how to drive FET gates
> in there. Just use this link and you will see all of them.
> http://www.intersil.com/design/parametric/partsearch.asp?txtprodnr=hip408
>
> Also you should be able to find some application notes on the IR web site
> where you found the transistor data sheet.
../\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
I checked the site, Tx.  Are you suggesting that I develop an H-bridge type
to drive this solenoid?  I did not understand the avenue you offered in
regards to driving the main FET.  Could you please re-iterate or simplify
your feedback.  Thank you. {slewrate}

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics