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Switch Mode Power Supply Stability and Compensation

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can anyone help in explaining how compensation is done for a boost converter? for instance, page 11 of thehttp://cds.linear.com/docs/Datasheet/3471fb.pdf shows locations of poles and zeros for a given application, but I can't understand how those values maped to the graph they show in page 11. I thought I could easily calculate the poles and zeros and then for every pole we have -20dB/decade and for every zero we have 20dB/decade, but this is not what I see in the graph. I might be missing something.

does anyone have a mathcad file with the transfer function and compensation technique. can somebody explain this compensation ?
 

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