Nikhil
I think finally, I may have come upon the ramp that appears to make the uCC28c42 run in voltage mode.
Appears. Do not know if it is so indeed.
Pl see attached file.
In a word or 2: the ramp one is so accustomed to being told to add at the CS pin must be a symmetric ramp not a saw tooth. What all controllers have for "ramp" is a sawtooth waveform. If you apply any fraction of this at the CS pin, the behavior is pretty predictable: the gate dr latch is reset at the peak & it is set back on at the 0 level of the sawtooth- giving the characteristic 99.9% duty waveform at the gate dr.
You change it to a symmetric triangular waveform, then gate dr output will look like getting controlled correctly.
However: there is still a problem. You will notice that the gate drive output is in bursts. I could not get it to be continuous. Again, this is typical of instability in voltage mode operation.
I am wondering if you can address the issue of how to make it continuous noit bursts & be stable.
UCC28C42_STEADY3rd.TSCThanks.
