converter. Placing the boost converter before the buck converter offers additional advantages in SPV array fed BLDC motor driven water pump. The placement of the boost converter at the front end of buck converter and output of SPV array makes the input current continuous because the input inductor of the boost converter works as a ripple filter. Secondly, the placement of the buck converter at the back end of the boost converter and before the VSI contributes to get the continuous output current and soft starting of the BLDC motor. Therefore, a boost-buck (BB) DC-DC converter which follows the aforementioned sequence of cascading the boost and buck converters is proposed to achieve the soft starting of the BLDC motor and ripple free input current. The BB converter is always operated in continuous conduction mode (CCM) to reduce the stresses on the devices and components. The proposed BB converter, operating as a non-inverting buck-boost converter also provides an additional feature of middle stage voltage control of the boost and buck converters. The detailed operation and working principle of the proposed BB converter are explained in the following sections. The starting, dynamic and steady state performances of an electronically commutated BLDC motor coupled with a water pump fed by SPV array-BB converter are analyzed under the variation of atmospheric conditions through simulated results using MATLAB/Simulink and experimental validation.