confusion about dcdc modeling equation

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dyjguilin

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Hello,

today I saw an book to describe the modeling of power switch for dcdc.
for me there is a question that about the slope value calculation:
* for the buck, it is obviously that the up slope is S1=(Vin-Vout)/L
* while from the book, it is expressed as S1=Vac/L

I am confused about this equation, and does any one can help me to understand the equation shown in books (especially, how to get/deduce the equation?)

thanks!
 

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