Pulse width modulation device and method with feedback control

The invention discloses a pulse width modulation device with feedback control, which is used for driving an external load, and comprises a pulse width modulator, an encoding regulator, a power driver and a controller. The pulse width modulator converts an input pulse code modulation code into a pulse width modulation code; the encoding regulator converts the pulse width modulation code into an upper end driving signal and a lower end driving signal; the power driver receives the upper end driving signal and the lower end driving signal for driving the external load; the controller measures a voltage of the external load, and generates a control signal according to the upper end driving signal and the lower end driving signal; and the controller transmits the control signal to the encoding regulator for regulating the upper end driving signal and the lower end driving signal. The pulse width modulation device and a pulse width modulation method provided by the invention can improve the distortion of driving audio signals.