Consider the step-down (buck) dc-dc converter shown in the figure below, in which all components are ideal. Assume the output voltage Vo = 5 V, held constant by controlling the duty cycle D = ton/T; the PWM control responds to the output voltage feedback by adjusting the switch "on time" ton to that fraction of the switching period T required to hold the output constant.The switching frequency is set at 50 kHz. The input voltage Vin varies from 10 V to 40 V.Calculate the minimum inductance L required to keep the converter operation in a continuous-conduction mode under all conditions (Vin= 10 V to 40 V). [Select the one best answer from the choices given below.]

Fig: 1

Fig: 2