# Output capacitance in analysis of Buck Converter

In an analysis of buck converter, we make few assumptions. Those are:

• The circuit is operating in steady state.
• The inductor current is continuous.
• The capacitor is very large and the output voltage is held constant.
• The switching period is $$\T\$$; the switch is closed for time $$\DT\$$ and opens for time $$\(1-D)T\$$
• The components are ideal.

Here we say that the capacitor is very large to keep output constant.

How large, in Farads, should the capacitor be?