PVCC

PVCC

GAIN1

6

AVCC

7

8

AGND

9

GVDD

OUTN

BSN

BSP

OUTP

23

22

21

20

TPA3112D1-Q1

FAULT

2

GND

3

4

GND

5

GAIN0

PVCC

BSN

OUTN

PGND

27

26

25

24

PLIMIT

10

INN

11

12

INP

13

NC

PGND

OUTP

BSP

PVCC

19

18

17

16

AVCC

14

PVCC

15

GND

29

PowerPAD

SD

1

PVCC

28

PVCC

100 F

0.1 F

1000 pF

100 F

0.1 F

1000 pF

Audio

Source

Control

System

AVCC

100 k

Ω

10

100 k

(1)

Ω

AVCC

1 k

Ω

FB

FB

0.47 F

1000 pF

0.47 F

1000 pF

1 µF

1 µF

1 µF

1 µF

TPA3112D1-Q1

www.ti.com

SLOS793B – SEPTEMBER 2012 – REVISED SEPTEMBER 2015

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The TPA3112D1-Q1 device is an automotive class-D audio amplifier. It accepts either a single ended or

differential analog input, amplifies the signal, and drives up to 25-W across a bridge tied load, usually a speaker.

Because an analog input is needed, this device is often paired with a codec or audio DAC if the audio source is

digital.

The four digital input/output pins, GAIN0, GAIN1, SD, and FAULT, can be pulled up to PVCC. When connecting

these terminals to PVCC, a 100 k

Ω-resistor must be put in series to limit the slew rate. One of four gain settings

is used depending on the configuration of GAIN0 and GAIN1. The SD pin is used to put the device in shutdown

or normal mode. The FAULT pin is used to indicate if a DC detect or short circuit fault was detected. The next

few sections explains design considerations and how to choose the external components.

8.2 Typical Application

(1)

100 k

Ω resistor is needed if the PVCC slew rate is more than 10 V/ms.

Figure 16. Mono Class-D Amplifier With BTL Output

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