In this paper output voltage of chosen buck DC – DC converter is regulated at nominal output voltage of 13 volts under [1] under supply disturbance of 20 to 25 volt and vice versa [2] under load disturbance of 28 to 50 ohms and vice versa. The performance indices considered are overshoot and undershoot in the output voltage under these disturbances and the corresponding settling times. These indices are found to be within the permissible limits validating the control strategy developed using the available DS1103 dSPACE board. The output voltage of the buck converter after suitable scaling is fed to the on board ADC of DS1103. Based on the error between the desired output voltage and the actual output voltage under the disturbances, the PID control strategy developed appropriately manipulates the duty cycle of the buck converter and such PWM pulses generated by DS1103 board are given to the gate of the MOSFET through suitable drivers to regulate the output voltage at the desired value. CLP1103 panel is used for ease of operation. Work is being extended to regulate output voltage and provide equal current sharing among two paralleled buck converters