This paper describes buck converter with closed loop discrete Proportional, Integral and Derivative (PID) controller is designed and simulated. The dynamic performance of the buck converter can be improved by the design of discrete PID PWM controller. Analog PI & PID Controller of buck converter is designed and simulated whose performance parameters are compared with the Discrete PID Controller is illustrated. The DC-DC converter can withstand its regulation performance with the variations in input supply voltage, circuit inductance, capacitance and load resistance.
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