Texas Instruments SLOU023A manual 2.TPA112 MSOP EVM, 3.TPA112 MSOP EVM Schematic Diagram, Details

The TPA112 MSOP Audio Power Amplifier Evaluation Module

3.2 The TPA112 MSOP Audio Power Amplifier Evaluation Module

The TPA112 MSOP audio power amplifier evaluation module is powered by a TPA112 150-mW stereo audio amplifier IC. It can drive either line-level outputs, 32-Ωheadphones, or 8-Ωspeakers. A single-supply operational amplifier (TLV2211) on the module provides a buffered midpoint voltage to properly bias the noninverting inputs of the TPA112 amplifier IC.

The evaluation module can be used with the TI plug-n-play audio amplifier evaluation platform (Figure 3 –1) or wired directly into circuits or equipment. The module has single in-line header connector pins mounted to the under side of the board. These pins allow the module to be plugged into the TI platform, which automatically makes all the signal input and output, power, and control connections to the module. The module connection pins are on 0.1-inch centers to allow easy use with standard perf board and plug board-based prototyping systems. Or, the EVM can be wired directly into existing circuits and equipment when used stand-alone.

The module appears in Figure 3–2 and its schematic is shown in Figure 3 –3.

Figure 3–2. TPA112 MSOP EVM

TEXAS	Vdd	GND
INSTRUMENTS	+

IN1– IN1+

R5

R6

			C5
	C4	R7
C1				R8
R1					Vo1
R2
					GND
R3
R4
C2					C6

U2

C3

IN2–

JP1

C7 R9 R10 GND Vo2

IN2+

SLOP126

TPA112 MSOP EVM

†Due to the very small size of the MSOP IC package, the standard part number TPA112 is replaced with the code TIAAD

Figure 3–3. TPA112 MSOP EVM Schematic Diagram

C4

R7

Vo1

0.1 ∝

F

8

20 kΩ

1

VDD

Vo1

IN –

R8

VDD

+

C6

2.5 to 5.5 V

C5

Audio

C1

82 kΩ

2

10 ∝

F

1 ∝

F

R1

IN 1–

GND

Input 1

0.1 ∝

F

20 kΩ

3

7

IN +

IN 1+

Vo2

Vo2

R2

TPA112

R10

VDD

C2

R4

82 kΩ

MSOP

82 kΩ

R5

0.1 ∝

F

6

IN +

20 kΩ

Mid

4

GND

IN 2–

U2

+

20 kΩ

5

R3

IN 2+

_

C3

Audio

Mid

C7

82 kΩ

R9

U1

1 ∝ F

Input 2

0.1 ∝

F

20 kΩ

IN –

R6, 20 kΩ

Details

3-3