power switch network modeling questions

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dyjguilin

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Hello,

I have a question about the signal modeling equation of power switch as shown below; and my question is how to get (deduce) the equation of s1 and s2 in a buck? it confuse me a lot!

for me, it is very clear that for the up slope of buck, s1=(vin-vout)/L
but how to transfer this expression to s1=vac/L ?

thanks!
 

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