> 1.4sec

mP

TPA3116D2

SDZ

MUTE

FAULTZ

SDZ

MUTE

FAULTZ

TPA3116D2

TPA3118D2

TPA3130D2

www.ti.com

SLOS708B – APRIL 2012 – REVISED MAY 2012

Table 5. DC Detect Threshold

4.5

0.96

6

1.30

12

2.60

18

3.90

SHORT-CIRCUIT PROTECTION AND AUTOMATIC RECOVERY FEATURE

The TPA31xxD2 family 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 29. MUTE Driven by Inverted FAULTZ

Figure 30. Timing Requirement for SDZ

THERMAL PROTECTION

Thermal protection on the TPA31xxD2 family 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.

Copyright © 2012, Texas Instruments Incorporated

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Product Folder Link(s): TPA3116D2 TPA3118D2 TPA3130D2