A buck PWM converter has Vi = 10 to 40V, Vo = 5V, Io = 0.2 to 1A, fs = 200kHz, L = 100 uH, C = 100uF, and rc = 20mΩ. Find the ripple voltage Vr. Also, calculate the ripple voltage across the filter capacitance and the corner frequency of the output filter. If the capacitance is reduced to 47uF, then what would be the ripple voltages.