Datasheet

50V
100ms
Max
MaxRampRate
15V/ms
PVDD
50V
29V
26V
23V
22V
14.4V
Hi-Z AllCh’s
I CStop
StandbyMode
2
LoadDumpProtection
29V–50V
OvervoltageProtectionRegion
23V–29V
NormalOperatingRegion
8V–22V
Time
POR
I CStart
2
ReadytoGet
OffHi-ZState
T0189-01
TAS5414A, TAS5424A
SLOS535C –MAY 2009– REVISED APRIL 2011 www.ti.com
Figure 15. Voltage Operating Regions With Load Dump Transition Defined
Power Supply
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 0.1μF/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 0.1μF/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.
I
2
C Serial Communication Bus
The TAS5414A and TAS5424A communicate with the system processor via the I
2
C serial communication bus.
The TAS5414A and TAS5424A are I
2
C slave-only devices. The processor can poll the TAS5414A and the
TAS5424A via I
2
C to determine the operating status of the device. All fault conditions and detections are
reported via I
2
C. There are also numerous features and operating conditions that can be set via I
2
C.
The I
2
C 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.
• 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.
• Select AM non-interference switching frequency
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