This paper presents a front-end ac-dc high power factor single stage topology. The proposed topology has good efficiency, better power factor and small size structure. The electronic ballast is designed with buck boost converter. The electronic ballast supplies power to fluorescent lamp. The lamp power regulation for the variations in the input voltage is assured. The steady state operation of the electronic ballast is done. The design of the converter in carried out from the basic principle. The equations for the electronic ballast circuit is derived from the basic principle and the analysis of the converter is done based on the equations. The elements used in the converter circuit is designed using the derived equations. The proposed converter circuit is developed for testing using 40W lamp and to determine the performance of the converter. The input pf measured has become more than 0.99. The electronic ballast efficiency with PFC circuit and buck boost converter is 94.46%

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