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50V

100ms

Max

MaxRampRate

25V/ms

PVDD

50V

29V

26V

23V

22V

14.4V

Hi-Z AllCh’s

I CStop

StandbyMode

LoadDumpProtection

29V–50V

OvervoltageProtectionRegion

23V–29V

NormalOperatingRegion

8V–22V

Time

POR

I CStart

ReadytoGet

OffHi-ZState

T0189-01

Power Supply

I2C Serial Communication Bus

TAS5414

TAS5424

SLOS514 – FEBRUARY 2007

DESCRIPTION OF OPERATION (continued)

Figure 15. Voltage Operating Regions With Load Dump Transition Defined

The power for the device is most commonly provided by a car battery that can have a large voltage swing, 8 Vdc

to 18 Vdc. PVDD is a filtered battery voltage, and it is the supply for the output FETS and the low-side FET gate

driver. The high-side FET gate driver is supplied by a charge pump (CP) supply. The charge pump supplies the

gate drive voltage for all four channels. The analog circuitry is powered by AVDD, which is a provided by an

internal linear regulator. A 0.1

µF/10V external bypass capacitor is needed at the A_BYP pin for this supply. It is

recommended that no external components except the bypass capacitor be attached to this pin. The digital

circuitry is powered by DVDD, which is provided by an internal linear regulator. A 0.1

µF/10V external bypass

capacitor is needed at the D_BYP pin. It is recommended that no external components except the bypass

capacitor be attached to this pin.

The TAS5414 and TAS5424 can withstand fortuitous open ground and power conditions. Fortuitous open

ground usually occurs when a speaker wire is shorted to ground, allowing for a second ground path through the

body diode in the output FETs. The uniqueness of the diagnostic capabilities allows the speakers and speaker

wires to be debugged, eliminating the need to remove the amplifier to diagnose the problem.

The TAS5414 and TAS5424 communicate with the system processor via the I2C serial communication bus. The

TAS5414 and TAS5424 are I2C slave-only devices. The processor can poll the TAS5414 and the TAS5424 via

I2C to determine the operating status of the device. All fault conditions and detections are reported via I2C.

There are also numerous features and operating conditions that can be set via I2C.

The I2C bus allows control of the following configurations:

• Independent gain control of each channel. The gain can be set to 12 dB, 20 dB, 26 dB, and 32 dB.

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