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By gain, do you want to make the output voltage rise quickly to your desired level? Then you should adjust things so you draw greater power from the supply, quickly. This includes frequency and duty cycle. The boost converter is different from a buck converter because the buck supply is more easily able to respond immediately to change, whereas the boost type requires more thought in its design and control method.
Do you mean that you want Vout=2*Vin? Or that you want
an {error amp to output} gain that ensures stability given
the op amp frequency response, output filter and feedback
network details?
You want high enough loop gain that load regulation is
decent and PSRR is driven down to amplifier-internal
limits, but not so high that you haven't gone to A=1
well before fSW (else you will amplify all kinds of self
generated "activity")
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