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TPA is a battery-powered headphone power amplifier from TI with a 50mW stereo output. The supply voltage is 1.6~3.3V, and there is an output enable pin. It is worth noting that (a) the chip data specifically states that the ESD protection ability of the modified device is limited, and attention should be paid to GATE level breakdown of the MOS tube inside the chip when using, welding and storage; (b) The capacitor of the BYPASS pin is selected because the capacitor with a small equivalent series resistance value is selected; (c) The resistance value of the feedback resistance of the amplifier should be appropriately selected according to the formula provided by the DATASHEET; (d) When the amplification factor is greater than 10, the PF-level capacitor can be shunt on the feedback resistance, and the integrated circuit is conducive to the stability of the amplifier circuit.