According to the present invention, there is provided an isolated gate driver comprising: a low voltage part including a PWM transmission unit for receiving a PWM signal from a microcontroller unit and outputting a low voltage PWM signal, and a low voltage logic block for receiving a control signal from the microcontroller unit and outputting a low voltage control signal; an insulation part for boosting the low voltage PWM signal and the low voltage control signal into a high voltage PWM signal and a high voltage control signal, respectively; and a high voltage part insulated from the low voltage part by the insulation part, wherein the high voltage part including: a high voltage logic block for outputting a slew rate control signal in accordance with the high voltage control signal; a slew rate controller for controlling a slew rate of a gate voltage of a power device external to the isolated gate driver such that the gate voltage of the power device has the slew rate depending on the slew rate control signal at a rising edge or a falling edge; and a slew rate feedback unit including a slew rate measuring unit for measuring the slew rate of the gate voltage and allowing the slew rate controller to change the slew rate of the gate voltage.