1

2

3

4

5

6

7

8

GAIN/SLV

GVDD

INPL

INNL

MUTE

GND

PLIMIT

AM2

GND

1µF

1µF

1µF

1µF

GND

1µF

/FAULTZ

IN_P_RIGHT

IN_N_RIGHT

IN_N_LEFT

IN_P_LEFT

MUTE

100k

100k

100k

> 1.4sec

mP

TPA3131/32D2

SDZ

MUTE

FAULTZ

SDZ

MUTE

FAULTZ

TPA3131D2, TPA3132D2

SLOS841B – SEPTEMBER 2013 – REVISED JANUARY 2015

www.ti.com

The minimum output offset voltages required to trigger the DC detect are show in Table 5. The outputs must

remain at or above the voltage listed in the table for more than 420 msec to trigger the DC detect.

Table 5. DC Detect Threshold

4.5

0.96

6

1.3

12

2.6

18

3.9

7.3.10 Short-Circuit Protection and Automatic Recovery Feature

The TPA313xD2 has protection from over current conditions caused by a short circuit on the output stage. The

short circuit protection fault is reported on the FAULTZ pin as a low state. The amplifier outputs are switched to a

high impedance state when the short circuit protection latch is engaged. The latch can be cleared by cycling the

SDZ pin through the low state.

If automatic recovery from the short circuit protection latch is desired, connect the FAULTZ pin directly to the

SDZ pin. This allows the FAULTZ pin function to automatically drive the SDZ pin low which clears the short-

circuit protection latch.

In systems where a possibility of a permanent short from the output to PVDD or to a high voltage battery like a

car battery can occur, pull the MUTE pin low with the FAULTZ signal with a inverting transistor to ensure a high-

Z restart, like shown in the figure below:

Figure 24. MUTE Driven by Inverted FAULTZ

Figure 25. Timing Requirement for SDZ

7.3.11 Thermal Protection

Thermal protection on the TPA313xD2 prevents damage to the device when the internal die temperature

exceeds 150°C. There is a ±15°C tolerance on this trip point from device to device. Once the die temperature

exceeds the thermal trip point, the device enters into the shutdown state and the outputs are disabled. This is a

latched fault.

Thermal protection faults are reported on the FAULTZ terminal as a low state.

If automatic recovery from the thermal protection latch is desired, connect the FAULTZ pin directly to the SDZ

pin. This allows the FAULTZ pin function to automatically drive the SDZ pin low which clears the thermal

protection latch.

16

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