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The PWM doesn't really care about PWM duty
proportionality because the error amp is there
to take that out by feedback.
If you want to use feedback (like an RC filter)
and the error amp in the loop then you should be
able to get decent(-ish) linearity. At the cost of
some lag.
I don't see an input here, so which voltage you
refer to is unclear.
yes there are limiatations. But my point is proportionaly to Comp voltage.There are limitations to what duty cycle this chip can do.
Easily by paralleling both outputs. Already done in post #1.How to get 0-90% duty cycle?