Control to output transfer function of buckboost converter?

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treez

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In equation 2A-24 (page 233) of the book “switch mode power supplies” by Christophe Basso, there is a paramreter called “wz3”.
In the expressions below equation 2A-24 , it says that “wz3= 1/(R.Cs.D’)”

The problem is, how do we calculate “Cs”?

…The book states that “Cs” is calculated from the PWM switch model technique, but how do you calculate Cs if you can’t do the PWM switch model technique?
 

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