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In this study, the buck converter circuit which is the topology of the power electronic circuit has been investigated to obtain the desired output voltage. The state variable of the circuit that is also used output of the system have been optimally controlled. The PI controller which is the basic structure and widely used in the practical applications has been run in discrete time. The PI controller parameters can be calculated by using a method based on the rootlocus, pole placement or Ziegler-Nichols method. However, these methods can not provide a solution with highe fficiency signal output voltage. In order to obtain the minimal cost value of the control process, Kp and Ki control parameters are optimized by using the Fire Fly (FF) algorithm based on swarm intelligence. The Matlab-Simulink program has been utilized for the simulations. The results show that the FF algorithm may observe the optimal values for the controller parameters.