Calculation of the Output Voltage Ripple in a Buck converter

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azsdel23

Joined Mar 6, 2018
1
The load is connected in parallel with a capacitor and its ESR. I don't understand the calculation of the ripple on the ESR. Why should it be calculated as 2I*ESR? Where does the 2 come from?

I is the current that flows through ESR
 
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