Provided is an electrical load driving device including an SMPS (switching mode power supply). The electrical load driving device comprises: a rectifying unit configured to rectify a current on an output path of the SMPS; a current limiting unit configured to limit the current output from the rectifying unit to a value equal to or less than a predetermined magnitude; a smoothing unit configured to supply a power to a load by smoothing a current output from the current limiting unit; and a floating prevention unit configured to be installed between an output terminal of the rectifying unit and an input terminal of the current limiting unit and to prevent an output of the rectifying unit from floating when the current limiting unit is interrupted.