1. Steady-state conditions exist.
2. The switching period is T, and the switch is closed for time DT and open for
(1D)T.
3. The inductor current is continuous (always positive).
4. The capacitor is very large, and the output voltage is held constant
at voltage Vo.
5. The components are ideal.
The analysis proceeds by examining the inductor voltage and current for the
switch closed and again for the switch open.