The prime objective of this research is to compare the behavior of Zeta converter and Boost converter in order to achieve robust time response and proper voltage regulation in a closed-loop system. An adjustable voltage gain that depends on the duty ratio of the switch at high frequency is also observed in this article. A small-signal model for both converters is derived to achieve linearity of the system. The Ziegler-Nichols Frequency Domain Method (ZNFDM) is used for the tunning of Proportional-Integral (PI) controller to achieve better performance of the model. The time domain scrutiny of the model is performed in MATLAB/Simulink software, which depicts an improved transient response of the system.