Datasheet

TPA3106D1

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SLOS516C –OCTOBER 2007–REVISED AUGUST 2010

SHORT-CIRCUIT PROTECTION AND AUTOMATIC RECOVERY FEATURE

The TPA3106D1 has short-circuit protection circuitry on the outputs that prevents damage to the device during

output-to-output shorts, output-to-GND shorts, and output-to-V

shorts. When a short circuit is detected on the

outputs, the part immediately disables the output drive. This is a latched fault and must be reset by cycling the

voltage on the SHUTDOWN pin or MUTE pin. This clears the short-circuit flag and allows for normal operation if

the short was removed. If the short was not removed, the protection circuitry again activates.

The FAULT terminal can be used for automatic recovery from a short-circuit event, or used to monitor the status

with an external GPIO. For automatic recovery from a short-circuit event, connect the FAULT terminal directly to

the MUTE terminal. When a short-circuit event occurs, the FAULT terminal transitions high indicating a

short-circuit has been detected. When directly connected to MUTE, the MUTE terminal transitions high, and

clears the internal fault flag. This causes the FAULT terminal to cycle low, and normal device operation resumes

if the short-circuit is removed from the output. If a short remains at the output, the cycle continues until the short

is removed. If external MUTE control is desired, and automatic recovery from a short-circuit event is also desired,

an OR gate can be used to combine the functionality of the FAULT output and external MUTE control, see

Figure 33.

THERMAL PROTECTION

Thermal protection on the TPA3106D1 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 set point, the device enters into the shutdown state and the outputs are disabled. This is not

a latched fault. The thermal fault is cleared once the temperature of the die is reduced by 30°C. The device

begins normal operation at this point with no external system interaction.

Product Folder Link(s): TPA3106D1