LED lighting sources have been used in several applications than established lighting sources due to their high luminous efficiency, environmental friendly, long life, compact size, and not affected by cold temperature. This paper deals with the design of buck-boost LED driver for wide input voltage applications. The proposed LED driver is a combination of uncontrolled rectifier followed by buck-boost converter. This converter is appropriate for wide input voltage applications from 85 Vac – 265 Vac. Over the line range, this topology accomplishes less total harmonic distortion (THD) and good power factor (PF). Average current control scheme is worn to accomplish improved power factor (PF) with low harmonics of line current. Simulation of buck-boost converter with LED load has been developed using PSIM software for 33.67 W. Load has modelled by connecting 13 LEDs in series by supplying 3.7 V & 0.7 A for each LED. For the proposed LED driver, parameter like power factor (PF) and total harmonic distortion (THD) of source current are assessed, it shows the power factor and THD of source current is very low and satisfies the IEC-61000-3-2 class C limits.