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Feed-forward dc gain (LM25037)

Other Parts Discussed in Thread: LM25037

Hi All,

I am working on a 12V to 48V feed-foward votlage mode push-pull converter with a LM25037 controller. I am trying to work out the dc gain to compensate the converter and here what I came up with:

Total dc gain = Modulator gain + Transformer gain + Feedback Divider gain + Opto gain

How would I go about calculate the modulator gain for this converter since the ramp is linked to the input voltage?

thanks

Ben