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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

2

LoadDumpProtection

29V–50V

OvervoltageProtectionRegion

23V–29V

NormalOperatingRegion

8V–22V

Time

POR

I CStart

2

ReadytoGet

OffHi-ZState

T0189-01

Power Supply

I

TAS5414A, TAS5424A

SLOS535A – JULY 2007 – REVISED FEBRUARY 2008

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 TAS5414A and TAS5424A 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.

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

• Select current limit (for 2-Ω and for 4-Ω loads). This allows optimal design of the filter inductor, and the use of

smaller gauge speaker wires for 4-

Ω applications.

Copyright © 2007–2008, Texas Instruments Incorporated

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Product Folder Link(s): TAS5414A TAS5424A