TPA3111D1-Q1

SLOS759E – MARCH 2012 – REVISED DECEMBER 2015

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7 Detailed Description

7.1 Overview

The TPA3111D1-Q1 device is AEC-Q100 qualified with temperature grade 1 (–40°C to 125°C), HBM ESD

classification level H2, and CDM ESD classification level C2 (see the ESD Ratings table). This automotive audio

amplifier also features several protection mechanisms as follows:

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DC-Current Detection:

–

The TPA3111D1-Q1 device protects speakers from DC current by reporting a fault on the FAULT pin and

turning the amplifier outputs to a Hi-Z state when a DC current is detected. The PVCC supply must be

cycled to clear this fault.

•

Short-Circuit Protection and Automatic Recovery:

–

The TPA3111D1-Q1 device has short circuit protection from the output pins to VCC, GND, or to each

other. If a short circuit is detected, it is reported on the FAULT pin and the amplifier outputs switch to a Hi-

Z state. The fault can be cleared by cycling the SD pin.

–

To recover automatically from this fault, connect the FAULT pin directly to the SD pin.

•

Thermal Protection:

–

When the die temperature exceeds 150°C (±15°C) the device enters the shutdown state and the amplifier

outputs are disabled. The TPA3111D1-Q1 device recovers automatically when the temperature decreases

by 15°C.

The functional modes of the TPA3111D1-Q1 device are as follows:

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Gain setting:

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The gain of the TPA3111D1-Q1 device is set to one of four options by the state of the GAIN0 and GAIN1

pins. Changing the gain setting also changes the input impedance of the TPA3111D1-Q1 device.

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Refer to Table 2 for a list of the gain settings.

•

Shutdown Mode:

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The SD pin can be used to enter the shutdown mode which mutes the amplifier and causes the

TPA3111D1-Q1 device to enter a low-current state. This mode can also be triggered to improve power-off

pop performance.

•

PLIMIT:

–

The PLIMIT pin limits the output peak-to-peak voltage based on the voltage supplied to the PLIMIT pin.

The peak output voltage is limited to four times the voltage at the PLIMIT pin.

The Feature Description and Device Functional Modes sections provide more details about these functions.

10

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