A DC-DC converter is a electronic circuit that synthesis different DC voltage levels from DC source. DC-DC converters has wide range of applications in Industries, automotive and transportation, electrical appliances and so on. Objective of this paper is to model a DC-DC converter which controls the converters output and keeps it constant irrespective of change in the input parameters. The Pulse Width Modulation, Proportional Integral Controller, Proportional Derivative Controller (PID) and Proportional Integral Derivative Controller are the well known methods known to control DC-DC converter. But the performance shows deviations when there is large parameter in load. This is why adaptive non-linear controllers such as Fuzzy Logic Controller (FLC) is used. The non-linear controllers provides a much faster response compared to linear controllers. Thus in this paper we have simulated and compared PID controller with FLC controller for DC-DC converter using MATLAB / SIMULINK. Further a new scheme of cascading FLCs is implemented to improve the performance.