Hi Philldpapill,
Thank you so much for your generocity and kindness, I really appreciate the helping hand. And also thank you ridelong for your very useful info & suggestions, very helpful, thank you
Unfortunately, at this point in my life, I am in between housing moves, and am working out of boxes, and only have a small area to work with (VERY small...lol) and I do not currently have the equipment on hand to fabricate SMT prototypes. I am actually PACE certified (PACE SMT solder equipment courses) and have worked in the electronic assembly and manufacturing field doing electronic assembly, running wave solder machines, pick & place machines, ect... for many years (not now, in the past, thank God! LOL)
I also used to etch my own double sided copper clad boards at one time, using the UV photoresist technique, but gave that up years ago. Too messy!
When you drive your mosfet via the UCC27322, do you put a V-gate resistor between the driver and the mosfet gate, or just drive it direct out of the 2 outputs of the UCC27322? Do you connect BOTH of the UCC27322's outputs to the gate of the mosfet, or only one, and leave the other floating?
I'm assuming you at least put a 1uF electrolytic and a 0.1uF ceramic cap close to the UCC27322's output as the datasheet suggest, from the output to ground, as close as possible it says, don't you?
Do you use a DC bypass cap between the output of the UCC27322 and the mosfet's gate? I've seen this in a few schematics, and have wondered why it is there, and I also wondered how you are generally interfacing the UCC27322 to the mosfet, as you say you regularly use them in your designs.
What do you use to drive the input of the UCC27322? Just a 555 timer circuit configured to your needs?
I also wondered a bit about the UCC27322's datasheet where it states the input to the UCC27322, it is a "bit" obscure in it's description of the required input voltages.
It states the UCC27322 input voltage to input pin 2 as
"" -5 to 6V "" OR VDD +0.3V, and then further confuses me with the statement "WHICH EVER IS LARGER".
Does this mean you have to either power the input with a 5V logic pulse for example, (falls within the -5 to 6V recommendation)
OR lets say if VDD is 12V, then you can also power it optionally with a 12.3V input signal??
Usually I'm pretty good about reading these things, been doing it all my life, but it's always been hammered into my head that rail voltages are NOT to exceed supply voltages, so I'm a bit confused. I hope you can clarify this for me. I hope I'm not just asking a totally OBVIOUS question, and look foolish in doing so, I think I'm slipping in my old age of 42....LOL.
I would REALLY appreciate your Eagle cad files, but I guess I'll have to install Eagle again, I've been thinking about doing so anyhow, but keep toiling with whether or not to install Protel instead, as it's what I've always used in the past.
By the way, I've asked this question and not had an answer, what frequencies should the PWM be running at, and why? Is there a pulsed duty cycle also, like a certain on/off waveform of a certain frequency? Such as a pulsed 44Khz waveform for example. If so, what is the duty cycle, what are the frequencies??
Thanks again guys, I DO appreciate all your help!