A car battery that can have a large voltage range most commonly provides the power for the 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. AVDD, provided by an internal linear regulator powers the analog circuitry. This supply requires 0.1-μF, 10-V external bypass capacitor at the A_BYP pin. TI recommends not connecting any external components except the bypass capacitor to this 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 recommends not connecting any external components except the bypass capacitor to this pin.

The TAS5414C can withstand fortuitous open-ground and -power conditions. Fortuitous open ground usually occurs when a speaker wire shorts to ground, allowing for a second ground path through the body diode in the output FETs. The diagnostic capability allows debugging of the speakers and speaker wires, eliminating the need to remove the amplifier to diagnose the problem.