Question 1 This simulation assignment examines the use of synchronous rectification to generate the 1 V, 20 A power supply required by a microprocessor. A 12 V bus is available, and hence the object is to design a 12V:1V buck converter. We will model the microprocessor with a 50 milliohm resistor. Download the buck converter zip file for this assignment. This file contains a conventional buck converter that employs a MOSFET (IRFZ44N) and a schottky diode (MBRB2545CT). There is both a 12 V power input Vg and a 12 V floating gate driver power supply. The switching frequency is 100 kHz. Do not change the element values or circuitry. Manually adjust the commanded duty cycle Vduty so that the output voltage is 1 V /- 25 mV. What value of Vduty is required to achieve the required output voltage? 1 point 2. Question 2 For the conditions of Question 1, what is the converter efficiency? Carefully measure average output voltage and average input currents over an integral number of switching periods, with the circuit operating in steady state. Enter a numerical value that lies in the range (0,1), with an accuracy of /- 0.005 1 point 3. Question 3 Now modify the buck converter to operate with a synchronous rectifier, realized using an IRFH5004 MOSFET in place of the schottky diode. Add a dead time generator (copy this from the synchronous boost simulation lecture file), with a dead time of 100 ns. Add another driver for the synchronous rectifier, and use a bootstrap power supply for the high side driver. Adjust the values of the gate driver resistors as shown. Power both drivers from Vg. A schematic is given below. Schematic of buck converter simulation Adjust the duty cycle so that the output voltage is 1.00 V /- 25 mV. What value of Vduty is now required? 1 point 4. Question 4 It is highly suggested that you examine the circuit waveforms for steady-state operation of the converter: Examine the switch node voltage. Can you explain the small steps in this waveform? Examine the gate-to-source voltages o
