Pop-up noise prevention circuit, digital amplifier including the same and method of preventing pop-up noise in an digital amplifier

Pop-noise prevention circuit including a switch unit and a switch signal is generated. The switch portion is connected to the output load and connected in parallel between the output node and a reference node of the digital amplifier, and controls the current flowing through the output load by in response to a switch signal to form a conductive path between the output node and the reference node. The switch signal generating unit in response to a switch control signal having the information of the power source is cut off, and to generate the switch signal. Accordingly, the pop-noise prevention circuit, it is possible to form a conductive path connected in parallel to both ends of the output load to remove the pop-up noise that is generated when applying or off the power of the digital amplifier. A pop-up noise, D-class amplifier, the digital amplifier, a pulse width modulation