A car battery that can have a large voltage range most commonly provides the power for the TAS5404-Q1 device. PVDD is a filtered battery voltage, and it is the supply for the output FETS and the low-side FET gate driver. The supply for the high-side FET gate driver comes from a charge pump (CP). The charge pump supplies the gate-drive voltage for all four channels. An internal linear regulator provides AVDD which powers the analog circuitry. The supply requires a 0.1-μF, 10-V external bypass capacitor at the A_BYP pin. TI does not recommend connecting any external components except the bypass capacitor to the A_BYP pin. DVDD, which comes from an internal linear regulator, powers the digital circuitry. The D_BYP pin requires a 0.1-μF, 10-V external bypass capacitor. TI does not recommend connecting any external components except the bypass capacitor to the A_BYP pin.

The TAS5404-Q1 device can withstand fortuitous open-ground and open-power conditions. Fortuitous open ground usually occurs when a speaker wire shorts to ground, which allows for a second ground path through the body diode in the output FETs. The diagnostic capability allows debugging of the speakers and speaker wires, which eliminates the necessity to remove the amplifier to diagnose the problem.