Read the link given below
http://www.ecircuitcenter.com/Circuits/cmodel1/cmodel1.htm
And the post below.
You must know when it is no longer a capacitor.
Its determined by a) capacitance & self-resonant frequency which is always given by the caps datasheet.
In the previous attempts, my electrolytic was probably acting as an inductor. The WIMA was acting as a capacitor.
In my DC buck converter, I know why I have a voltage ripple. At f = 50 kHz, I get an impedance of 2.5 from my RC network. You can calculate the Z magnitude manually or through bode plots. So if I have a current ripple of A, my voltage ripple V = A * Z.
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