Disclosed is a light emitting device driving apparatus for controlling a light emitting unit including series-connected light emitting device arrays. The apparatus includes a rectifier for rectifying an AC signal, and outputting a ripple current signal according to a result of the rectification, a current adjuster for outputting a selection voltage, and a sequential driving controller connected to channel lines connected to respective output terminals of the light emitting device arrays, the sequential driving controller selectively establishing current paths between the light emitting device arrays and the channel lines, based on a voltage level of the ripple current signal, and adjusting an intensity of current flowing through the channel lines, based on the selection voltage. The current adjuster performs analog-digital conversion upon a setting voltage, generates a digital value according to a result of the analog-digital conversion, and outputs one of a plurality of selective voltages, based on the digital value.