A simplebuck-boost converter topologywith a dimming feature using double PWM technique is presented for automotive lighting applications. The power circuit is simple and cost effective.The buck-boost converter hassingle controlled switch and four energy storing devices to perform bothoperations. The design of output filter capacitor is made small to use film capacitor in order to increase the life time of LED driver circuit. Simulation is performed in matlab-simulink for a power rating of 10W LED array load with an input voltage of 24V DCand the performance of the converter is presented under normal LED lighting and dimming conditions to prove the effectiveness of the control technique. © International Science Press.