Audio amplifier with feedback control

An audio amplifier, comprising:

• a plurality of power stages, wherein the plurality of power stages are coupled in parallel with each other, each of the plurality of power stages comprises a first switch and a second switch, the first switch and the second switch are coupled in series between a first reference voltage and a second reference voltage, and the first reference voltage is higher than the second reference voltage;
• a driving circuit, coupled to the plurality of power stages, and arranged to receive an input signal, and generate a driving signal to the plurality of power stages according to the input signal for driving the plurality of power stages;
• a power stage control circuit, comprising:
• a feedback circuit, coupled to the plurality of power stages, and arranged to generate a feedback signal according to at least one detection input, wherein the at least one detection input comprises a voltage signal corresponding to an output current of the plurality of power stages, and the output current is derived from a terminal coupled to the first reference voltage or a terminal coupled to the second reference voltage in each of the plurality of power stages;
• and
• a control circuit, coupled between the feedback circuit and the plurality of power stages, and arranged to generate a control signal according to the feedback signal, wherein the control signal is arranged to dynamically control a number of turned-on power stages in the plurality of power stages.