There is provided a motor driving apparatus capable of stably performing operation conversion between a normal mode and a sleep mode by counting a duty of the PWM signal according to a preset clock signal, the motor driving apparatus including: a pulse width modulation (PWM) signal generating unit providing a PWM signal for driving a motor; a driving unit operating normally in a normal mode and waiting for operation in a sleep mode according to a control, and driving the motor in response to the PWM signal of the PWM signal generating unit; and a driving controlling unit counting a duty of the PWM signal according to a preset clock signal to determine an operation mode of the driving unit.