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Error AMP in a current-control boost dc/dc

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fengluan

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A schematic of Error AMP is show below:
53_1166599172.GIF

One input is connected to feedback voltage ,the other is voltage reference.when V_FB risen, VC is logic '1',so that M1 is on.
who can tell me why the input needed to connect two depletion mosfet and a capacitor like that ,also what's the use of C3.
thanks
 

I guess it is for the compensation purpose .

C3 parallel with the R .
 

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