This paper illustrates about the design and implementation of 2.2 kW battery charger for electric locomotive using Texas controller with temperature sensing unit. The full bridge DC-DC converter approach of the battery charger caters mainly to high robustness, small size and low weight, low complexity, high efficiency and high conversion ratio. This topology is best suitable for handling high power, provides reduced Electromagnetic Interference (EMI) and known for reduced component stress. In this battery charger application, IGBTs are switched at 40 KHz for high efficiency and reduction in losses using Texas controller. The isolated buck topology is favoured for converter optimization and also helps in voltage regulation. The efficient variation of duty cycle in this proposed technique is used to regulate the output voltage at light loads. Also the presented DC-DC converter shows great conversion efficiency for large range of varying load conditions. The performance of the above DC-DC converter is evaluated via PSIM and hardware results are also been carried out.