TPA3112D1-Q1 Datasheet, PDF (15/32 Pages) Texas Instruments – Filter-Free Mono Class-D Audio Power Amplifier

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8 Application and Implementation
TPA3112D1-Q1
SLOS793B – SEPTEMBER 2012 – REVISED SEPTEMBER 2015
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 kΩ-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
PVCC
Control
System
Audio
Source
PVCC
100 kΩ
1
SD
1 kΩ
2
FAULT
28
PVCC
27
PVCC
3
GND
26
BSN
4
GND
25
OUTN
5
GAIN0
24
PGND
AVCC
6
GAIN1
23
OUTN
10 Ω
1 µF
7
AVCC
22
BSN
TPA3112D1-Q1
8
21
AGND
BSP
1 µF
9
GVDD
20
OUTP
10
PLIMIT
19
PGND
1 µF
11
INN
18
OUTP
AVCC
1 µF
(1)
100 kΩ
12
INP
13
NC
14
AVCC
17
BSP
16
PVCC
GND
15
PVCC
29
PowerPAD
100 μF 0.1 μF
1000 pF
0.47 μF
0.47 μF
FB
1000 pF
1000 pF
FB
100 μF 0.1 μF
1000 pF
PVCC
(1) 100 kΩ 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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