I'm working on this website
Could someone help me to understand those two statements:
1) "since the DC current of the inductor cannot flow through the output capacitor, then it can only flow to the load." But I can also read that "It is easy to see that during the off state, the capacitor is charged with current Iin".
My question is why the output DC current can't go inside the output capacitance but the input DC current can go inside input capacitance. I heard so many time that DC current can't go through a capacitance but at the input of buck it's what happen.
2) "That in turn means that only the ripple of the inductor current, centered around zero, flows through the capacitor. Then we have negative portions of the ripple that remove charge from the capacitor and positive portions of the ripple that add charge to the capacitor. Both must transfer the same amount of charge in equilibrium."
What way the decharging current of the output capacitance take. If I don't do any mistake : the only way I see is to decharge via load resistor. But that mean the load current is not so DC.