Consider the converter of Problem 1. Assume the drain of the IPB65R045C7 FET is initially at 400V and that CDG is 75pF. (For this problem we are assuming this very non-linear capacitor has a constant value). Suppose we drive the gate with a 2A current source and the drain begins to fall as soon as the gate voltage reaches Vth = 5V. From the point where the drain begins to fall, what is the minimum amount of time required for the drain to reach 0V