Headphone driver and driving method thereof

A headphone driver, driving a headphone apparatus, wherein the headphone apparatus has a first terminal, a second terminal, a third terminal, and a fourth terminal of fixed positions, the headphone driver comprising:

• a first differential driver, comprising a first positive output terminal, a first negative output terminal, and a second negative output terminal, the first positive output terminal connected to the first terminal;
• and
• a first switch unit, disposed on a feedback path of the first negative output terminal and the second negative output terminal, configured to enable the first negative output terminal in feedback as a close loop to output to the third terminal in a first operation state and disable the second negative output terminal in feedback and disable output of the second negative output terminal as an open loop, and to be switched, in a second operation state, to enable the second negative output terminal in feedback as a close loop to output to the fourth terminal and disable the first negative output terminal in feedback and disable output of the first negative output terminal as an open loop,
• wherein the first differential driver comprises a first positive voltage driving circuit, a first negative voltage driving circuit, and a second negative voltage driving circuit, respectively providing the first positive output terminal, the first negative output terminal, and the second negative output terminal.

A headphone driving method, driving a headphone apparatus, wherein the headphone apparatus comprises a first terminal, a second terminal, a third terminal, and a fourth terminal of fixed positions, the headphone driving method comprising:

• configuring a first differential driver to drive a first channel of the headphone apparatus and a microphone, the first differential driver comprising a first positive output terminal, a first negative output terminal, and a second negative output terminal, the first positive output terminal connected to the first terminal;
• and
• configuring a first switch unit, disposed on a feedback path of the first negative output terminal and the second negative output terminal, configured to be switched to connect the first negative output terminal to the third terminal in a first operation state and disconnect the second negative output terminal, and to be switched, in a second operation state, to connect the second negative output terminal to the fourth terminal and disconnect the first negative output terminal,
• wherein the first differential driver comprises a first negative voltage driving circuit and a second negative voltage driving circuit, respectively providing the first negative output terminal and the second negative output terminal.