Texas Instruments TPA0202 User Manual

TPA0202
Audio Power Amplifier
Evaluation Module

User’s Guide

May 1998 Mixed-Signal Products

SLOU016

IMPORTANT NOTICE

T exas Instruments (TI) reserves the right to make changes to its products or to discontinue any
semiconductor product or service without notice, and advises its customers to obtain the latest
version of relevant information to verify , before placing orders, that the information being relied
on is current.

TI warrants performance of its semiconductor products and related software to the specifications
applicable at the time of sale in accordance with TI’s standard warranty . T esting and other quality
control techniques are utilized to the extent TI deems necessary to support this warranty.
Specific testing of all parameters of each device is not necessarily performed, except those
mandated by government requirements.

Certain applications using semiconductor products may involve potential risks of death,
personal injury , or severe property or environmental damage (“Critical Applications”).

TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT APPLICATIONS, DEVICES
OR SYSTEMS OR OTHER CRITICAL APPLICATIONS.

Inclusion of TI products in such applications is understood to be fully at the risk of the customer.
Use of TI products in such applications requires the written approval of an appropriate TI officer .
Questions concerning potential risk applications should be directed to TI through a local SC
sales office.

In order to minimize risks associated with the customer’s applications, adequate design and
operating safeguards should be provided by the customer to minimize inherent or procedural
hazards.

TI assumes no liability for applications assistance, customer product design, software
performance, or infringement of patents or services described herein. Nor does TI warrant or
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Copyright  1998, Texas Instruments Incorporated

Related Documentation From Texas Instruments

J

TI Plug-N-Play Audio Amplifier Evaluation Platform

number SLOU011) provides detailed information on the evaluation
platform and its use with TI audio evaluation modules.

J

TPA0202 STEREO 2-W AUDIO POWER AMPLIFIER

number SLOS205) This is the data sheet for the TPA0202 audio
amplifier integrated circuit.

FCC Warning

This equipment is intended for use in a laboratory test environment only. It
generates, uses, and can radiate radio frequency energy and has not been
tested for compliance with the limits of computing devices pursuant to subpart
J of part 15 of FCC rules, which are designed to provide reasonable protection
against radio frequency interference. Operation of this equipment in other
environments may cause interference with radio communications, in which
case the user at his own expense will be required to take whatever measures
may be required to correct this interference.

Preface

(literature

(literature

Trademarks

TI is a trademark of Texas Instruments Incorporated.

Chapter Title—Attribute Reference

iii

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†

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hotline:

iv

Running Title—Attribute Reference

Contents

1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1 Feature Highlights 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Description 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 TP A0202 EVM Specifications 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Quick Start 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 Precautions 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Quick Start List for Platform 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Quick Start List for Stand-Alone 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Details 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Precautions 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 The TPA0202 Audio Power Amplifier Evaluation Module 3-3. . . . . . . . . . . . . . . . . . . . . . . . .

3.2.1 TPA0202 Audio Amplifier IC 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.2 Depop Circuitry 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.3 BTL Operation 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.4 SIngle-Ended Operation 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.5 Inputs and Gain 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3 Using The TPA0202 EVM With the Plug-N-Play Evaluation Platform 3-7. . . . . . . . . . . . . . .

3.3.1 Installing and Removing EVM Boards 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3.2 TPA0202 Module Jumper Settings and Switches 3-8. . . . . . . . . . . . . . . . . . . . . . . .

3.3.3 Signal Routing 3-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3.4 Mute/Mode 3-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3.5 Power Requirements 3-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3.6 Inputs and Outputs 3-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4 Using The TPA0202 EVM Stand-Alone 3-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4.1 TPA0202 EVM Connected for BTL Output 3-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4.2 TPA0202 EVM Connected for Single-Ended Output 3-17. . . . . . . . . . . . . . . . . . . . .

3.5 TPA0202 Audio Power Amplifier Evaluation Module Parts List 3-18. . . . . . . . . . . . . . . . . . .

Chapter Title—Attribute Reference

v

Running Title—Attribute Reference

Figures

1–1 The TI TPA0202 Audio Amplifier Evaluation Module 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1 Quick Start Platform Map 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–2 Module Preparation 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–3 Quick Start Module Map 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–1 The TI Plug-N-Play Audio Amplifier Evaluation Platform 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–2 TPA0202 EVM 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–3 TPA0202 EVM Schematic Diagram 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–4 TPA0202 Amplifier IC 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–5 TPA0202 EVM Jumpers and Switches 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–6 Platform Signal Routing and Outputs 3-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–7 Mute/Mode and Polarity Control 3-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–8 Typical Headphone Plug 3-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–9 TPA0202 EVM Connected for Stereo BTL Output 3-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–10 TPA0202 EVM Connected for Stereo Single-Ended Output 3-17. . . . . . . . . . . . . . . . . . . . . . . .

T ables

2–1 Typical TI Plug-N-Play Platform Jumper and Switch Settings for the TPA0202 2-1. . . . . . . . .

2–2 Typical TPA0202 EVM Jumper Settings 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–3 Platform Jumper and Switch Settings for the TPA0202 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–4 Typical TPA0202 EVM Jumper Settings 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–1 Typical TPA0202 EVM Jumper Settings for BTL Stand-Alone 3-16. . . . . . . . . . . . . . . . . . . . . .

3–2 Typical TPA0202 EVM Jumper Settings for Single-Ended Stand-Alone 3-17. . . . . . . . . . . . . .

3–1 TPA0202 EVM Parts List 3-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

vi

Chapter 1

Introduction

This chapter provides an overview of the Texas Instruments (TI) TPA0202
Audio Amplifier Evaluation Module (SLOP202). It includes a list of EVM
features, a brief description of the module illustrated with a pictorial diagram,
and a list of EVM specifications.

Topic Page

1.1 Feature Highlights 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Description 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 TP A0202 EVM Specifications 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Introduction

1-1

Feature Highlights

1.1 Feature Highlights

The TI TPA0202 Audio Amplifier Evaluation Module and the TI Plug-N-Play
Audio Amplifier Evaluation Platform include the following features:

-

TPA0202 Stereo 2-W Audio Power Amplifier Evaluation Module

J

J

J

J

J

J

J

J

-

Quick and Easy Configuration with The TI Plug-N-Play Audio Amplifier
Evaluation Platform

Internal depop circuitry to eliminate turn-on transients in outputs
Dual channel, bridge-tied load (BTL) or single-ended operation

3.3-V and 5-V operation
2 W per channel output power into 3 Ω at 5 V, BTL
850 mW per channel output power into 3 Ω at 3.3 V, BTL
Ultra-low current consumption in shutdown/mute mode (5 µA)
Internal input MUX selects among two sets of stereo inputs
Module gain adjustable between approximately 2 and 22

J

Evaluation module is designed to simply plug into the platform,
automatically making all signal, control, and power connections

J

Platform provides flexible power options

J

Jumpers on the platform select power and module control options

J

Switches on the platform route signals

J

Platform provides quick and easy audio input and output connections

-

Platform Power Options

J

External 5-V – 15-V DC VCC supply inputs

J

External regulated VDD supply input

J

Socket for on-board 5 V/3.3 V VDD voltage regulator EVM

J

On-board overvoltage and reverse polarity power protection

-

Platform Audio Input and Output Connections

J

Left and right RCA phono jack inputs

J

Miniature stereo phone jack input

J

Left and right RCA phono jack outputs

1-2

J

Left and right compression speaker terminal outputs

J

Miniature stereo headphone jack output

Introduction

1.2 Description

The TPA0202 Stereo 2-W Audio Power Amplifier Evaluation Module is a
complete, 2-Watt per channel stereo audio power amplifier. It consists of the
TI TP A0202 Stereo 2-W Audio Power Amplifier IC along with a small number
of other parts mounted on a circuit board that measures approximately 2
inches by 1½ inches (Figure 1–1).

Figure 1–1.The TI TPA0202 Audio Amplifier Evaluation Module

Description

¼

D1

S2

R5

R11

S6

R13

S1

ROUT+

GND

ROUT–

HP/L*

SE/BTL*

R12

S7

MUTE

LOUT–

GND

LOUT+

C7

C6

R10

R8

R7

RHP
GND
RIN
GND

TPA0202 SAMPLE EVM

Lit.# SLOP202

S8
R2

GND
LIN

GND
LHP

C1

C2

R1

R3

RVDD GND

+

C11

C8 R9

U1

C3 R4

+

C12

LVDD GND

S5

S3
S4

C10C9

C5C4

Single in-line header pins extend from the underside of the module circuit
board to allow the EVM to be plugged into the TI Plug-N-Play Audio Amplifier
Evaluation Platform, or to be wired directly into existing circuits and equipment
when used stand-alone.

The platform has room for a single TPA0202 evaluation module and is a
convenient vehicle for demonstrating TI’s audio power amplifier and related
evaluation modules. The EVMs simply plug into the platform, which
automatically provides power to the modules, interconnects them correctly,
and connects them to a versatile array of standard audio input and output jacks
and connectors. Easy-to-use configuration controls allow the platform and
EVMs to quickly model many possible end-equipment configurations.

There is nothing to build, nothing to solder, and nothing but the speakers
included with the platform to “hook up.”

Introduction

1-3

TPA0202 EVM Specifications

1.3 TPA0202 EVM Specifications

Supply voltage range, V
Supply current, I

DD

DD

Continuous output power per channel, P

Audio input voltage, V

: SE 4 Vpp max. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I

BTL 0.75 Vpp max. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Minimum load impedance, R

L

3 V to 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

:4-Ω BTL, VDD=5 V 2 W. . . . . . . . . . . . . . . . . . . . . .

O

4-Ω BTL, V

=3.3 V 800 mW. . . . . . . . . . . . . . . .

DD

2 A max. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Ω. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-4

Introduction

Chapter 2

Quick Start

The steps in this chapter can be followed to quickly prepare the TP A0202 audio
amplifier EVM for use. Using the TPA0202 with the TI Plug-N-Play Audio
Amplifier Evaluation Platform is a quick and easy way to connect power, signal
and control inputs, and signal outputs to the EVM using standard connectors.
However, the audio amplifier evaluation module can be used stand-alone by
making connections directly to the module pins, and can be wired directly into
existing circuits or equipment.

The platform switch and jumper settings shown in T able 2–1 are typical for the
TPA0202 EVM and will cause the TPA0202 to switch to single-ended output
mode when a plug is inserted into platform headphone jack J10.

Table 2–1. Typical TI Plug-N-Play Platform Jumper and Switch Settings for the TPA0202

EVM JP6 JP7 JP8 S2 S3

P-N-P Platform Mode X Hi Note 2 X

Notes: 1) X = Don’t care

2) Set S2 to ON when signal conditioning board is installed in U1; set S2
to OFF when no signal conditioning board is installed.

Table 2–2. Typical TPA0202 EVM Jumper Settings

EVM S1 S3 S4 S5 S6 S8

TPA0202 ON OFF OFF ON ON OFF

Note: S8 should remain OFF at all times.

ON = shunt installed
OFF = open

T opic Page

2.1 Precautions 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Quick Start List for Platform 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Quick Start List for Stand-Alone 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Quick Start

2-1

Precautions

2.1 Precautions

Power Supply Input Polarity and Maximum Voltage
Always ensure that the polarity and voltage of the external power

connected to V
input connector J6 are correct. Overvoltage or reverse-polarity

power input connector J1, J2, and/or VDD power

CC

power applied to these terminals can open on-board soldered-in
fuses and cause other damage to the platform, installed evaluation
modules, and/or the power source.

Inserting or Removing EVM Boards
Do not insert or remove EVM boards with power applied — damage

to the EVM board, the platform, or both may result.

Power

Input

7b

Audio
Input

9

Figure 2–1.

SOURCE

VCC

J1

In

+

D4

AC/DC

In

J2

Right

In

Stereo

In

Left

In

1997

Quick Start Platform Map

7b

JP3

JP2

JP1

DC

VCC(J1)

AC/DC

(J2)

Batt

D1

D2

D3

J3

Signal Conditioning

J4

J5

****CAUTION****

Do not insert or remove

EVM boards with power

TEXAS

INSTRUMENTS

Plug-N-Play Audio Amplifier
Evaluation Platform
SLOP097 Rev. C.1

VR1

F1

LED1

VCC

applied

C1+

R1

U1

117

Off Pwr

ConditioningS2

GND

On

S1

Audio
Power
Amps

OnOff

TP1

ICC
JP4

B1

IDD

U5

JP5

7b

U3 U4

R2

U2-U4

U5

HP

Source

SUPPLY

U2

HP(U5)

S3

R3

R4

POWER

LED2

VDD

JP6

Polarity

Lo
Hi

JP7

+

+

7b

U6

Out

Mode
Mute

Spk(U2-U4)

JP8

C3 C2

HP Out

J7

Right

Out

Out

J9

Out

Stereo

VR2

F2

+

J6

In/Out

VDD

J8

+–+–
Right

Left

Left

Headphone
Output

J10

R5

DC
Power
In/Out

Speaker
Output

7a

10

5

2-2

3

2

6

4

Quick Start

2.2 Quick Start List for Platform

Follow these steps when using the TP A0202 EVM with the TI Plug-N-Play Au­dio Amplifier Evaluation Platform (see the platform user’s guide, SLOU011, for
additional details). Numbered callouts for selected steps are shown in Figure
2–1 and Figure 2–2, and details appear in Chapter 3.

-

Platform preparations

1) Ensure that all external power sources are set to
power switch S1 is set to

2) Install a TPA0202 module in platform socket U2, taking care to align the
module pins correctly.

3) Use switch S2 to select or bypass the signal conditioning EVM (U1).

OFF.

Quick Start List for Platform

OFF

and that the platform

4) Set control signal Polarity jumper JP8 to

5) Set jumper JP6 to select the

Mode

control input (causes the TP A0202 to

Hi.

switch to the single-ended output mode if a plug is inserted into platform
headphone jack J10).

6) If the headphone Jack (J10) output will be used, set Hp source switch S3
to U2–U4.

Table 2–3. Platform Jumper and Switch Settings for the TPA0202

EVM JP6 JP7 JP8 S2 S3

P-N-P Platform Mode X Hi Note 2 X

Notes: 1) X = Don’t care

2) Set S2 to
to

-

Power supply

7) Select and connect the power supply (ensure power supply is set to
a) Connect an external regulated power supply set to 5 V to platform V

power input connector J6 taking care to observe marked polarity,
or

b) Install a voltage regulator EVM (SLVP097 or equiv .) in platform socket

U6. Connect a 7 V – 12 V power source to a platform V
J1 or J2 and jumper the appropriate power input (see platform user’s

guide).

ON

OFF

when signal conditioning board is installed in U1; set S2

when no signal conditioning board is installed.

power input

CC

OFF

):

DD

-

Inputs and outputs

8) Ensure that the audio signal source level is set to minimum.

9) Connect the audio source to left and right RCA phono jacks J3 and J5 or
stereo miniature phone jack J4.

10) Connect 3-Ω – 8-Ω speakers to left and right RCA jacks J7 and J9 or to
stripped wire speaker connectors J8.

Quick Start

2-3

Quick Start List for Platform

-

Evaluation Module Preparations

Figure 2–2.

Module Preparation

16

11) To have the module amplifier IC enter the shutdown mode when the
module mute control input is activated, set shutdown jumper S1 to
have the amplifier IC only mute when the module mute control input is
activated, set shutdown jumper S1 to

12) To select the line inputs, set input select jumper S3 to
headphone inputs, set input select jumper S3 to

C7

C6

C1

C2

R10

R8

R7

S8
R2

R1

R3

RHP
GND
RIN
GND

TPA0202 SAMPLE EVM

Lit.# SLOP202

GND
LIN

GND
LHP

RVDD GND

+

C11

C8 R9

U1

C3 R4

+

C12

LVDD GND

S5

S3
S4

C10C9

C5C4

OFF

14

12

R11

ROUT+

GND

S6

D1

S2

R5

R13

S1

ROUT–

HP/L*

SE/BTL*

R12

S7

MUTE

LOUT–

GND

LOUT+

15

13

11

ON

. T o

.

OFF

. To select the

ON

.

13) To allow the module SE/BTL
between single ended (SE) and bridge-tied load (BTL) output modes, set
output mode jumper S4 to
single-ended output mode regardless of the control input state, set jumper

S4 to

ON

.

14) Set V

bridge jumper S5 to either ON or

DD

15) To automatically select the headphone inputs when the single-ended
output mode is selected by the module SE/BTL
autosense control jumper

S6

pin from the module output mode select control input, set autosense
control jumper

S6

to

OFF.

16) Set junction temperature measurement jumper S8 to
operation.

Table 2–4. Typical TPA0202 EVM Jumper Settings

EVM S1 S3 S4 S5 S6 S8

TPA0202 ON OFF OFF ON ON OFF

Note: S8 should remain open at all times, ON = shunt installed, OFF = open

-

Power Up

17) Verify correct voltage and input polarity and set the external power supply
to

ON.

If VCC and an on-board regulator EVM are used to provide VDD, set

platform power switch S1 to

control input to switch the amplifier IC

OFF

. To keep the module amplifier IC in the

OFF

for normal operation.

control input, set

to

ON.

T o isolate the amplifier IC input select

OFF

for normal

ON.

2-4

Platform LED2 should light indicating the presence of VDD, and the evaluation
modules installed on the platform should begin operation.

18) Adjust the signal source level as needed.

Quick Start

2.3 Quick Start List for Stand-Alone

Follow these steps to use the TP A0202 EVM stand-alone or when connecting
it into existing circuits or equipment. Connections to the TPA0202 module
header pins can be made via individual sockets, wire-wrapping, or soldering
to the pins, either on the top or the bottom of the module circuit board.
Numbered callouts for selected steps are shown in Figure 2–3 and details
appear in Chapter 3.

Quick Start List for Stand-Alone

Figure 2–3.

Quick Start Module Map

RHP
GND
RIN
GND

TPA0202 SAMPLE EVM

11

-

Lit.# SLOP202

GND
LIN

GND
LHP

Power supply

1) Ensure that all external power sources are set to

2) Connect an external regulated power supply set to 5 V to the module VDD
and GND pins taking care to observe marked polarity. Separate right
channel and left channel VDD supplies can be connected, or a single
supply can be used for both.

C7

C6

C1

C2

RVDD GND

R10

R8

R7

S8

R2

R1

R3

C11

C8 R9

U1

C3 R4

C12

LVDD GND

9

7

R11

R13

S1

S6

R12

ROUT+

GND

ROUT–

HP/L*

SE/BTL*

S7

MUTE

LOUT–

GND

LOUT+

10

8

6

+

+

S5

S3
S4

C10C9

D1

C5C4

S2

R5

OFF.

-

Inputs and outputs

3) Ensure that audio signal source level adjustments are set to minimum.

4) Connect the audio source to the module RIN/LIN and GND or RHP/LHP
and GND pins of each channel taking care to observe marked polarity.

5) Select output mode:
a) For BTL output, connect an 3-Ω – 8-Ω speaker to the module OUT+

OUT– pins of each channel,
or

b) For single-ended output, connect a headphone or an 3-Ω – 8-Ω

speaker to the module OUT+ and GND pins of each channel through
a 33 µF to 1000 µF output-coupling capacitor (Figure 3–10).

Quick Start

2-5

Quick Start List for Stand-Alone

-

6) To have the module amplifier IC enter the shutdown mode when the

Evaluation Module Preparations

ON

module mute control input is activated, set shutdown jumper S1 to

. T o

have the amplifier IC only mute when the module mute control input is

OFF

activated, set shutdown jumper S1 to

.

7) To select the line inputs, set input select jumper S3 to
headphone inputs, set input select jumper S3 to

8) To allow the module SE/BTL

control input to switch the amplifier IC

ON

OFF

. To select the

.

between single ended (SE) and bridge-tied load (BTL) output modes, set
output mode jumper S4 to

OFF

. To keep the module amplifier IC in the

single-ended output mode regardless of the control input state, set jumper

ON

S4 to

9) Set V
power input pins together, or to

.

bridge jumper S5 to ON to connect the RVDD and L VDD module

DD

OFF

to keep the two power inputs isolated

on board

10) To automatically select the headphone inputs when the single-ended
output mode is selected by the module SE/BTL

S6

to

ON.

autosense control jumper

T o isolate the amplifier IC input select

control input, set

pin from the module output mode select control input, set autosense
control jumper

11) Set junction temperature measurement jumper S8 to

S6

to

OFF.

OFF

for normal

operation

-

Control Inputs

12) Connect control lines to the various module control input pins as needed:

2-6

a) HP/L*: A high selects the headphone input pins; a low or float selects

the line input pins.

b) SE/BTL*: A high selects the single-ended output mode; a low or float

selects the bridge-tied load output mode.

c) MUTE: A high mutes the amplifier IC on the module; a low or float

allows normal operation.

-

Power-up

13) Verify correct voltage and input polarity and set the external power supply
to

ON.

The EVM should begin operation.

14) Adjust the signal source level as needed.

Quick Start

Chapter 3

Details

This chapter provides details on the TP A0202 IC, the evaluation module, and
the steps in the Quick-Start List, additional application information, and a parts
list for the TPA0202 evaluation module.

Topic Page

3.1 Precautions 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 The TPA0202 Audio Power Amplifier Evaluation Module 3–3. . . . . . . . .

3.3 Using the TPA0202 EVM With the Plug-N-Play

Evaluation Platform 3–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4 Using The TPA0202 EVM Stand-Alone 3–16. . . . . . . . . . . . . . . . . . . . . . . .

3.5 TP A0202 Audio Power Amplifier Evaluation Module Parts List 3–18. .

Details

3-1

Precautions

3.1 Precautions

Power Supply Input Polarity and Maximum Voltage
Always ensure that the polarity and voltage of the external power

connected to V
input connector J6 are correct. Overvoltage or reverse-polarity
power applied to these terminals can open on-board soldered-in
fuses and cause other damage to the platform, installed evaluation
modules, and/or the power source.

Inserting or Removing EVM Boards
Do not insert or remove EVM boards with power applied — damage

to the EVM board, the platform, or both may result.

Figure 3–1.The TI Plug-N-Play Audio Amplifier Evaluation Platform

JP3

JP2

JP1

SOURCE

Power

Input

Audio
Input

In

+

AC/DC

In

VCC

D4

J2

In

In

In

J1

Right

Stereo

Left

DC

VCC(J1)

AC/DC

(J2)

D2

D3

J3

Signal Conditioning

J4

J5

Batt

D1

VR1

F1

VCC

C1+

LED1

R1

U1

power input connector J1, J2, and/or VDD power

CC

On

Off Pwr

S1

ICC
JP4

B1

JP5

IDD

Audio
Power
Amps

U3 U4

OnOff

ConditioningS2

R2

SUPPLY

VDD

U2

POWER

U6

LED2

VR2

F2

J6

In/Out

VDD

J7

Right

Out

J8

+–+–
Right

Out

Left

Out

+

DC
Power
In/Out

Speaker
Output

3-2

TEXAS

INSTRUMENTS

1997

Plug-N-Play Audio Amplifier
Evaluation Platform
SLOP097 Rev. C.1

****CAUTION****
Do not insert or remove
EVM boards with power

applied

GND

TP1

U5

U2-U4

U5

S3

HP

Source

HP(U5)

Polarity

JP7

+

R3

R4

JP6

Lo
Hi

+

Mode
Mute

Spk(U2-U4)

Out

JP8

C3 C2

HP Out

J9

Left

Stereo

J10

R5

Headphone
Output

Details

The TPA0202 Audio Power Amplifier Evaluation Module

3.2 The TPA0202 Audio Power Amplifier Evaluation Module

The TPA0202 Audio Power Amplifier Evaluation Module is powered by a
TPA0202 stereo power amplifier capable of delivering greater than 2 W of
continuous power per channel into 3-Ω loads. The amplifier IC can be operated
in either the BTL or single-ended output mode. The evaluation module
includes control inputs for muting and shutdown, selection between two sets
of stereo inputs, and switching between single ended and bridge-tied load
output modes.

The 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 stand­alone.

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

Figure 3–2.TPA0202 EVM

RHP
GND
RIN
GND

TPA0202 SAMPLE EVM

Lit.# SLOP202

GND
LIN

GND
LHP

C7

C6

C1

C2

RVDD GND

R10

R8

R7

S8
R2

R1

R3

C11

C8 R9

U1

C3 R4

C12

LVDD GND

R11

R13

S1

S6

R12

ROUT+

GND

ROUT–

HP/L*

SE/BTL*

S7

MUTE

LOUT–

GND

LOUT+

+

+

S5

S3
S4

C10C9

D1

C5C4

S2

R5

Details

3-3

The TPA0202 Audio Power Amplifier Evaluation Module

Figure 3–3.TPA0202 EVM Schematic Diagram

S8

1

LOUT+

LIN

LHP

LV

DD

LOUT–

MUTE IN

C1

1 µF

C3

5 pF

R1

20 kΩ

C2

1 µF

C12
10 µF

S2

R6
100 kΩ

R3

20 kΩ

R5

100 kΩ

LV

50 kΩ

DD

R2

2.2 µF
C5

2.2 µF

LV

DD

C4

S1

R4
20 kΩ

S7

2

3

4

5

6

7

8

9

10

11

12

LV

TPA0202

DD

R13

510 Ω

RBYPASSLBYPASS

D1

NCNC

DD

NCSHUTDOWN

24

23

22

21

20

19

18

17

16

15

14

13

R7

50 kΩ

R9
20 kΩ

C9

2.2 µF

LV

C10

2.2 µF

LV

S6

LV

DD

DD

DD

R10

20 kΩ

C8
5 pF

R8

20 kΩ

S5

C11

10 µF

S3

R11

100 kΩ

S4

R12

100 kΩ

C6

1 µF

C7

1 µF

ROUT+

RIN

RHP

RV

DD

HP/LINE

ROUT–
SE/BTL

GND/HSGND/HS

ROUT+LOUT+

RLINE INLLINE IN

RHP INLHP IN

RV

HP/LINEMUTE OUT

ROUT–LOUT–

SE/BTLMUTE IN

GND/HSGND/HS

3.2.1 TPA0202 Audio Amplifier IC

The TPA0202 audio amplifier IC is a CMOS device intended primarily for
bridge-tied load (BTL) operation in battery-powered applications. It is supplied
in a very small 24-pin TSSOP thermal surface-mount package and has been
designed to operate from low supply voltages (between approximately 3 V and

5.5 V) and deliver full power at distortion levels of less than 0.1% THD+N from
a 5-V supply (Figure 3 –4). Typical applications include portable computers
and multimedia systems.

3-4

Details

Figure 3–4.TPA0202 Amplifier IC

The TPA0202 Audio Power Amplifier Evaluation Module

MUX

MUX

The IC includes two separate amplifier channels, each of which can operate
in either the bridged-tied load (BTL) mode or the single-ended mode as
selected by the SE/BTL
channel operate 180° out-of-phase with each other for increased power. The
speaker load is connected directly across OUT+ and OUT–, and neither line
is connected to ground. BTL operation provides many benefits, including
quadruple the output power of single-ended operation and no need for bulky
output coupling capacitors. In the single-ended mode, the speaker load is
connected between the OUT+ terminal, through an output coupling capacitor,
to system ground. For more information, see the TPA0202 amplifier IC data
sheet, TI Literature Number SLOS205.

3.2.2 Depop Circuitry

The TPA0202 amplifier IC contains internal circuitry to minimize the various
turn-on transients that might appear at the output during the transition from
power off, shutdown, or mute to normal operation. Output turn-on transients
can be virtually eliminated by sequencing the control inputs to the IC such that
the TP A0202 amplifier is held in the single-ended output mode for a short time
after the mute control pin is released (see paragraph 3.3.2.7).

MUX

SE/BTL

pin. In the BTL mode, the two output lines of each

3.2.3 BTL Operation

To operate in the bridge-tied load output mode, the module SE/BTL control
input terminal must be held low. The module output signal from OUT+ must go

NOT

through the speaker load and be returned directly to OUT–, and

to system
ground. This requires that the OUT– line be isolated not only from system
ground, but also from the OUT– lines of any other amplifiers in the system. The
platform provides such isolated output lines from the amplifier EVM sockets
directly to separate left and right speaker connectors.

Details

3-5

The TPA0202 Audio Power Amplifier Evaluation Module

3.2.4 SIngle-Ended Operation

For single-ended operation, the module SE/BTL control input pin must be held
high. The speaker (or headphone) load is connected to the module OUT+
output pin through a coupling capacitor, and to platform/system ground. A
470 -µF electrolytic coupling capacitor is provided on the platform in the signal
path to the headphone output jack for this purpose, and a control signal from
the platform headphone jack can be routed to the module control input pin to
switch the TPA0202 IC to the single-ended mode.

In the single-ended mode, the amplifiers inside the TP A0202 IC that drive the
OUT– lines do not operate and do not dissipate any power. The OUT– pins go
into a high-impedance state and can be left connected or allowed to float.

3.2.5 Inputs and Gain

Each channel has two separate signal inputs that are pin-selectable. They are

line (L)

called
and the headphone inputs are fixed at a gain of –1. In the typical application
in which the TPA0202 powers small speakers until headphones are plugged
in, the difference in the gain selected for the two inputs provides approximately
the same perceived listening level in the headphones as from the speakers.
An input multiplexor in the amplifier IC selects between the two inputs
according to the state of the HP/LINE

and

headphone (HP

). The line inputs are fixed at a gain of 10

IC pin.

Gain for each input is determined by the ratio of the input resistor to the
feedback resistor on the module PCB. And, although the input gains are fixed
at the factory, they can be adjusted by changing the resistor values on the
module PCB. However, care must be taken because the surface-mount solder
pads on the PCB are somewhat fragile and will not survive many
soldering/desoldering operations. In addition, the values selected for the
gain-setting resistors affect the performance of the internal depop circuitry
(see the TPA0202 data sheet).

The TP A0202 amplifier IC, as most other amplifiers, exhibits its best distortion
and noise performance at lower gain levels (see the TPA0202 data sheet).
Even so, the TP A0202 at its highest gain setting has significantly less distortion
than most low-cost speakers.

Gain versus total harmonic distortion (THD) should be considered in each
application. Both the module input signal level and the TP A0202 module gain
should be adjusted to obtain the lowest overall distortion level for a particular
overall gain. A quick rule of thumb (everything else being equal): the module
input signal level should be as high as possible without clipping or overloading
the TP A0202 input, and the TP A0202 gain should be kept as low as possible.

3-6

Details

Using The TP A0202 EVM With the Plug-N-Play Evaluation Platform

3.3 Using The TPA0202 EVM With the Plug-N-Play Evaluation Platform

The TPA0202 Audio Amplifier Evaluation Module was designed to be used
with the TI Plug-N-Play Audio Amplifier Evaluation Platform. It simply plugs
into socket U2.

The following paragraphs provide additional details for using the TPA0202
EVM with the platform.

3.3.1 Installing and Removing EVM Boards

TI Plug-N-Play evaluation modules use single-in-line header pins installed on
the underside of the module circuit board to plug into sockets on the platform.
The EVM pins and the platform sockets are keyed such that only the correct
type of EVM can be installed in a particular socket, and then only with the
proper orientation.

Evaluation modules are easily removed from the platform by simply prying
them up and lifting them out of their sockets. Care must be taken, however, to
prevent bending the pins.

3.3.1.1 EVM Insertion

3.3.1.2 EVM Removal

1) Remove all power from the evaluation platform.

2) Locate socket U2 on the platform.

3) Orient the module correctly.

4) Carefully align the pins of the module with the socket pin receptacles.

5) Gently press the module into place.

6) Check to be sure that all pins are seated properly and that none are bent

over.

1) Remove all power from the evaluation platform.

2) Using an appropriate tool as a lever, gently pry up one side of the module

a small amount.

3) Change to the opposite side of the module and use the tool to pry that side

up a small amount.

4) Alternate between sides, prying the module up a little more each time to

avoid bending the pins, until it comes loose from the socket.

5) Lift the EVM off of the platform.

Details

3-7

Using The TP A0202 EVM With the Plug-N-Play Evaluation Platform

3.3.2 TPA0202 Module Jumper Settings and Switches

The TP A0202 EVM is equipped with several pushbutton SPST switches and
jumpers that act as SPST switches to allow module operation to be modified
to suit various requirements. In the following discussion, setting a jumper to

ON

means that a shunt is installed across the two pins of the jumper. Setting

a jumper to

OFF

means that no shunt is installed on the jumper. See Figure

3.5.
In typical applications, some or all of the jumper functions are controlled by the

system microcontroller or external logic.

Figure 3–5.TPA0202 EVM Jumpers and Switches

S8

LOUT+

LIN

LHP

LV

DD

LOUT–

MUTE IN

C1

1 µF

C3

5 pF

R1

20 kΩ

C2

1 µF

C12
10 µF

S2

R6
100 kΩ

R3

20 kΩ

R5

100 kΩ

LV

50 kΩ

DD

R2

2.2 µF
C5

2.2 µF

LV

DD

C4

S1

R4
20 kΩ

S7

10

11

12

1

2

3

4

5

6

7

LV

DD

8

9

R13

510 Ω

TPA0202

RBYPASSLBYPASS

D1

GND/HSGND/HS

NCNC

ROUT+LOUT+

RLINE INLLINE IN

RHP INLHP IN

RV

DD

NCSHUTDOWN

HP/LINEMUTE OUT

ROUT–LOUT–

SE/BTLMUTE IN

GND/HSGND/HS

24

23

22

21

20

19

18

17

16

15

14

13

R7

50 kΩ

R9
20 kΩ

C9

2.2 µF

LV

C10

2.2 µF

LV

S6

LV

DD

DD

DD

R10

20 kΩ

C8
5 pF

R8

20 kΩ

S5

C11

10 µF

S3

R11

100 kΩ

S4

R12

100 kΩ

C6

1 µF

C7

1 µF

ROUT+

RIN

RHP

RV

DD

HP/LINE

ROUT–
SE/BTL

3-8

Details

3.3.2.1 S1 — Shutdown Jumper

To have the module amplifier IC enter the shutdown mode when the module
mute control input is activated, set shutdown jumper S1 to ON.

The mute control output pin on the TPA0202 amplifier IC follows the mute
control input pin and is buffered. Jumper S1 connects the mute output pin to
the shutdown control input pin of the IC so that when S1 is ON, the IC is forced
into shutdown mode instead of mute mode when the mute control input goes
high. When S1 is OFF, a pulldown resistor on the module holds the IC
shutdown control input pin low, keeping the IC out of the shutdown mode.

The shutdown mode reduces IC current consumption to approximately 5 µA
compared to approximately 1.5 mA in the mute mode. It takes longer, however ,
to resume normal operation from the shutdown mode (approx. 1 s to 2 s) than
it takes to resume normal operation from the mute mode (approx. 100 ms to
500 ms).

3.3.2.2 S2 — Mute Switch

Pushbutton switch S2 on the TPA0202 EVM allows manual muting of the
amplifier IC.

Using The TP A0202 EVM With the Plug-N-Play Evaluation Platform

3.3.2.3 S3 — Input Select Jumper

To select the line inputs, set input select jumper S3 to OFF. To select the
headphone inputs, set input select jumper S3 to

The TPA0202 amplifier IC has two separate inputs for each channel. An
internal multiplexor selects which input will be connected to the amplifier
based on the state of the HP/LINE
control input pin is not directly controlled by anything on the platform — the
platform socket for that module pin is N/C. The amplifier IC HP/LINE
pin can be tied high manually via jumper S3 or connected to the amplifier IC
SE/BTL

control pin via jumper S6 so that it follows that control signal.

For manual control, jumper S3 connects the HP/L* module control input pin to
V

, so that when S3 is ON, the headphone inputs are selected. When S3 is

DD

OFF, a pulldown resistor on the module holds the IC shutdown control input
pin low, selecting the line inputs.

3.3.2.4 S4 — Output Mode Jumper

To keep the module amplifier IC in the single-ended output mode regardless
of the module control input state, set jumper S4 to ON.

Jumper S4 connects the SE/BTL output mode control input pin on the amplifier
IC directly to V
output mode regardless of the state of the SE/BTL* module control input.
When S4 is OFF , a pulldown resistor on the module holds the IC output mode
control input pin low, keeping the IC in the BTL output mode.

ON.

pin on the IC. However, the EVM HP/L*

, so that when S4 is ON, the IC is held in the single-ended

DD

control

Details

3-9

Using The TP A0202 EVM With the Plug-N-Play Evaluation Platform

3.3.2.5 S5 — VDD Bridge Jumper

Jumper S5 connects the module L VDD power supply line to the RVDD power
supply line. When the TPA0202 EVM is plugged into the platform, both VDD
supplies are sourced from the same platform power bus, so the state of jumper
S5 is irrelevant.

If the EVM is used stand-alone, jumper S5 can be set to ON to simplify
connection of the module to external power, or set to OFF to allow each
amplifier channel to be powered from a separate supply.

3.3.2.6 S6 — Autosense Jumper

To automatically select the headphone inputs when the single-ended output
mode is selected by the module SE/BTL* control input, set autosense control

S6

to ON

jumper
Jumper S6 connects the SE/BTL output mode select pin of the amplifier IC to

the HP/LINE
automatically when the single-ended output mode is selected by the mode
signal applied to the module SE/BTL* control input pin.

.

input select pin of the amplifier IC so that the HP input is selected

Note that when autosense jumper S6 is set to ON, the headphone input
the single-ended output mode are selected, and the SE/BTL* control signal will

either

have no effect, if

jumper S3 or jumper S4 are set to ON.

3.3.2.7 S7 — SE Output Mode Switch

Pushbutton switch S7 on the TP A0202 EVM allows the manual selection of the
single-ended output mode.

When used in conjunction with mute switch S2, output thumps and pops that
might occur when returning to normal operation from the mute mode can be
eliminated by releasing mute switch S2 half a second before releasing the SE
output mode switch S7 (see the TPA0202 data sheet for more information).

In a typical application, this sequencing can be controlled by the system micro­controller or external logic.

3.3.2.8 S8 — Junction Temperature Measurement Jumper

Set junction temperature measurement jumper S8 to OFF for normal
operation.

The TP A0202 amplifier IC sources a current proportional to the device junction
temperature that can be measured at the terminals of jumper S8 with an
ammeter. This is not intended as a real-time measurement, but as an aid to
the design and characterization of the PCB on which the IC is mounted. See
the TPA0202 IC data sheet for additional information.

and

3-10

Details

Using The TP A0202 EVM With the Plug-N-Play Evaluation Platform

3.3.3 Signal Routing

Signal flow on the platform is controlled by two signal routing switches, as
shown in Figure 3–5.

Figure 3–6.Platform Signal Routing and Outputs

Off

R

Audio

Input

L

U1

Signal

Conditioning

3.3.3.1 Signal Conditioning

The audio signal from the input jacks can be applied to the signal conditioning
socket (U1) if an EVM is installed there, or socket U1 can be bypassed and the
audio input signal applied directly to the inputs of the TPA0202.

-

Switch S2 selects signal conditioning or bypasses it

S2

On

U2

TPA0202

Amplifier EVM

U5

Stereo

Headphone

Amplifier

+

GND

R

L

R

L

–

J7, J8, J9

Speaker

Outputs

–
+

+
–

Headphone

Output

–
+

J10

R

L

U2–U4

R

S3

L

U5

3.3.3.2 Headphone Output Jack

Switch S3 is the source select for the stereo headphone output jack, J10. The
headphone jack is capacitively coupled (via 470 µF electrolytics) and can
output either the signal from the headphone amplifier in socket U5, or the
signal from the TP A0202 power amplifier installed in socket U2, as determined
by the setting of headphone source select switch S3.

When S3 is set to the power amplifier position (U2 – U4), the headphone jack
is connected to the TP A0202 power amplifier OUT+ output lines. When a plug
is inserted into the jack, signals output through J10 are returned to platform
ground, requiring single-ended power amplifier operation. A switch inside the
headphone jack produces a control signal that can be routed to the power
amplifier socket to shut down the TPA0202 EVM or switch it to single-ended
output mode when a plug is inserted.

Source select switch S3 connects the headphone jack to the output lines of
either the headphone amplifier socket U5, or the power amplifier sockets
(U2 – U4).

J

T o keep the TP A0202 amplifier outputs separated, set switch S3 to the
headphone amplifier position (
J8, and J9)

J

T o route the TPA0202 amplifier outputs to the headphone output jack
(J10), set switch S3 to the power amplifier position (
this setting
connected to J10

U5

) and use the speaker outputs (J7,

U2 – U4)

only

if the TPA0202 EVM is to drive single-ended loads

— use

Details

3-1 1

Using The TP A0202 EVM With the Plug-N-Play Evaluation Platform

3.3.4 Mute/Mode

The TP A0202 EVM is equipped with a mute control input pin. When this input
is tied to V
and dissipates very little power. When the EVM control input is tied to GND or
allowed to float, amplifier operation resumes.

In typical applications, as often found in notebook computers, portable audio
products, and such, the internal speakers mute when headphones are
plugged into the headphone jack, or internal speakers mute when external
speakers are connected. In applications using separate speaker and
headphone amplifiers, the one not being used can be shut down (muted) to
conserve power.

A mode control input pin on the EVM switches the TPA0202 amplifier IC
between the bridge-tied load (BTL) output mode and the single-ended (SE)
output mode. When the mode control input is tied to GND, the module operates
in the BTL output mode. When this input is tied to V
in the single-ended output mode.

In the typical application, output mode switching allows the TPA0202 to
operate in the BTL output mode for increased power to internal speakers and
then switch to single-ended mode to drive headphones when a plug is inserted
into the headphone jack.

, the TP A0202 amplifier IC on the module enters the mute mode

DD

, the module operates

DD

3.3.4.1 Headphone Jack Control Signals

The platform headphone output jack (J10) contains an internal switch that
changes the state of a pair of control lines when a plug is inserted (Figure 3–6).
Each control line is pulled down by a 1-kΩ resistor to ground (R4 and R5). The
switch in the headphone jack pulls one line or the other up to V
240-Ω resistor (R3) depending on whether a plug is inserted in J10 or not.

Figure 3–7.Mute/Mode and Polarity Control

V

DD

R3
240 Ω

J10

Headphone

Jack

R4
1 kΩ

R5
1 kΩ

Polarity

JP8 JP6

Lo

Hi

SPK

(U2–U4)

Mode

Mute

through a

DD

U2

Power

Amplifier

3-12

Details

Using The TP A0202 EVM With the Plug-N-Play Evaluation Platform

3.3.4.2 Mute/Mode Select (JP6)

A 3-pin jumper header (JP6) on the platform, functioning as an SPDT switch,
routes the control signal from the headphone jack to either the mute control
input pin or the mode control input pin of the evaluation module.

J

To mute the TPA0202 amplifier module using the control signal from
the platform headphone jack, jumper JP6 to

J

T o switch the output mode of the TP A0202 amplifier between BTL and
single-ended using the control signal from the platform headphone
jack, jumper JP6 to

3.3.4.3 Mute/Mode Polarity Select (JP8)

A second 3-pin jumper header (JP8) on the platform selects the control signal
polarity by connecting either the active-high or the active-low line from the
headphone jack to jumper JP6.

-

When JP6 is set to Mute, use the following JP8 settings for the TP A0202:

J

T o mute the TP A0202 amplifier module
headphone jack, jumper JP8 to

MODE

MUTE

when

a plug is inserted into the

Hi

(this is the typical setting).

J

T o mute the TP A0202 amplifier module
headphone jack, jumper JP8 to

-

When JP6 is set to Mode, use the following JP8 settings for the TP A0202:

J

To switch the TPA0202 amplifier module to the
mode

when a plug is inserted into the headphone jack, jumper JP8 to

Hi

(this is the typical setting).

J

T o switch the TP A0202 amplifier module to the
a plug is inserted into the headphone jack, jumper JP8 to

Lo

until

a plug is inserted into the

.

single-ended

BTL

output mode when

Lo

output

.

Details

3-13

Power Requirements

3.3.5 Power Requirements

The TP A0202 Audio Power Amplifier Evaluation Module can operate from any
voltage between approximately 3 V and 5.5 V; however , the TPA0202 amplifier
IC on the module is characterized for operation at 3.3 V and 5 V. For best
performance (highest output power with lowest distortion), the module should
be operated at approximately 5 V unless there is a specific reason for
operating it from a lower voltage.

The TI Plug-N-Play Audio Amplifier Evaluation Platform with a voltage
regulator EVM installed on it can provide a regulated V
variety of unregulated V
12 V, including an on-board 9 -V battery. Or, an external regulated power
source can be used to supply V
evaluation module installed on it.

Although the TPA0202 amplifier IC draws approximately 1.25 A from the
power supply during continuous full power output, peak current draw can be
as high as 2 A. Any power supply connected to the platform should be capable
of providing 2 A of current to avoid clipping of the output signal during peaks.
Current consumption driving speakers at normal listening levels is typically

0.5 A or less.

supply from a wide

DD

voltage inputs between approximately 5.5 V and

CC

voltage to the platform and the TPA0202

DD

The platform is equipped with overvoltage and reverse-polarity supply voltage
input protection in the form of fused crowbar circuits.

-

VDD voltage applied to platform screw terminals J6

MUST NOT

exceed
the absolute maximum rating for the TP A0202 amplifier IC installed on the
evaluation module (6 V) or damage to the IC may result. In no case should

voltage of the incorrect polarity or in excess of 6.1 V be applied to

V

DD

screw terminals J6 of the platform, or the power protection circuit on the
V

line will trip.

DD

-

VCC voltage applied to the platform

MUST NOT

exceed the maximum
voltage input specified for the voltage regulator module installed in socket
U6 (12 V for the SLVP097), or damage to the voltage regulator module
may result. In no case should V
15 V, or the overvoltage protection circuit on the V

voltage applied to the platform exceed

CC

bus will trip.

CC

3-14

Details

3.3.6 Inputs and Outputs

The TI Plug-N-Play Audio Amplifier Evaluation Platform is equipped with
several standard conectors for audio inputs and outputs.

3.3.6.1 Inputs

In most cases, audio signals enter the platform through either a pair of RCA
phono jacks (J3 and J5) or a miniature (1/8″) stereo phone jack (J4). Certain
signal conditioning and amplifier EVMs, however, may have additional signal
input connectors mounted on the module circuit board.

The platform audio signal input jacks (J3, J4, and J5) are of the closed-circuit
type, grounding the signal input lines when no plugs are inserted.

3.3.6.2 Outputs

Amplified audio output signals leave the platform through left and right RCA
phono jacks (J7 and J9), left and right pairs of compression connectors for
stripped speaker wires (J8), and optionally , through a miniature (1/8″ ) stereo
phone jack (J10), for headphones.

The audio output lines from the power amplifiers are separate all the way to
the edge of the platform (output jacks J7, J8, and J9) — the OUT– lines from
the power amplifier sockets are not tied to each other or to platform ground.
This allows the TP A0202 power amplifier EVM to operate in the highly-efficient
bridge-tied load configuration when driving speakers.

Inputs and Outputs

The headphone jack (J10) is capacitively coupled to source select switch S3,
which connects J10 to the output lines of either the headphone amplifier
socket or the power amplifier sockets (Figure 3–5). When the TPA0202 output
signal is routed to J10 by S3, signals output via J10 are returned to platform
ground when a plug is inserted (Figure 3–7), requiring single-ended operation
of the power amplifiers.

Figure 3–8.Typical Headphone Plug

Left Right GND

Details

3-15

Using The TPA0202 EVM Stand-Alone

3.4 Using The TPA0202 EVM Stand-Alone

Using the TP A0202 Audio Power Amplifier Evaluation Module stand-alone is
much the same as using it with the platform. The same 3-V to 5.5-V power
supply range and the isolated OUT+ and OUT– lines for BTL operation
requirement exists.

Note that the mute signal applied to the EVM mute pin must be able to supply
enough current to overcome the pulldown resistor on the module (100 kΩ).

3.4.1 TPA0202 EVM Connected for BTL Output

Figure 3–9.TPA0202 EVM Connected for Stereo BTL Output

5 V

D1

S2

R5

R11

S6

R13

S1

ROUT+

GND

ROUT–

HP/L*

SE/BTL*

R12

S7

MUTE

LOUT–

GND

LOUT+

Audio

Input

(Right)

Audio

Input
(Left)

C7

C6

R10

R8

R7

RHP
GND

RIN
GND

TPA0202 SAMPLE EVM

Lit.# SLOP202

S8

R2

GND
LIN
GND
LHP

C1

C2

R1

R3

RVDD GND

+

C11

C8 R9

U1

C3 R4

+

C12

LVDD GND

S5

S3
S4

C10C9

C5C4

5 V

Table 3–1. Typical TPA0202 EVM Jumper Settings for BTL Stand-Alone

EVM S1 S3 S4 S5 S6 S8

TPA0202 X OFF OFF ON X OFF

Note: ON = shunt installed, OFF = open, X = don’t care, S8 = always OFF

Right

5 V

External Mute

Control

(active high)

Left

3-16

Details

Using The TPA0202 EVM Stand-Alone

3.4.2 TPA0202 EVM Connected for Single-Ended Output

Figure 3–10. TPA0202 EVM Connected for Stereo Single-Ended Output

5 V

Audio

Input

(Right)

Audio

Input

(Left)

C7

C6

R10

R8

R7

RHP
GND
RIN
GND

TPA0202 SAMPLE EVM

Lit.# SLOP202

S8
R2

GND
LIN
GND
LHP

C1

C2

R1

R3

RVDD GND

+

C11

C8 R9

U1

C3 R4

+

C12

LVDD GND

S5

S3
S4

C10C9

C5C4

D1

S2

R5

R11

S6

R13

S1

ROUT+

ROUT–

SE/BTL*

R12

MUTE

LOUT–

LOUT+

GND

HP/L*

S7

GND

5 V

Mute

+

+

5 V

Table 3–2. Typical TPA0202 EVM Jumper Settings for Single-Ended Stand-Alone

EVM S1 S3 S4 S5 S6 S8

TPA0202 X ON ON ON X OFF

Note: ON = shunt installed, OFF = open, X = don’t care, S8 = always OFF

33 µF –
1000 µF

33 µF –
1000 µF

Details

3-17

TP A0202 Audio Power Amplifier Evaluation Module Parts List

3.5 TPA0202 Audio Power Amplifier Evaluation Module Parts List

Table 3–1. TPA0202 EVM Parts List

Ref. Description Size

C1, C2,
C6, C7

Capacitor, 1 µF,
80%/–20%, nonpolarized

EVM

Qty.

1206 4 Murata

Manufacturer/

Part Number

GRM42-6Y5V105Z16BL

Digi-Key Number

Newark
93F2254

C4, C5,
C9, C10

C3, C8 Capacitor, 5 pF 0805 2 Panasonic

C1 1, C12 Capacitor, 10 µF, 6.3 V A 2 Panasonic

R1, R2,
R4, R8,
R9, R10

R2, R7 Resistor, 50 kΩ, 1/8 W, 5% 0805 2 Panasonic

R5, R6,
R1 1, R12

R13 Resistor, 510 kΩ, 1/8 W,

D1 Diode SMD 1
S2, S7 Switch, momentary SMD 2 Panasonic

S1,
S3–S6,
S8

Capacitor, 2.2 µF, 20%,
nonpolarized

Resistor, 20 kΩ, 1/8 W, 5% 0805 6 Panasonic

Resistor, 100 kΩ, 1/8 W,
5%

5%

Header, 2 position 2 mm 6 Norcomp Digi-Key

1206 4 TDK

C3216X5R1A225

ECU-V1H050CCN

ECS-TOJY106R

ERJ-8GEYJ203V

ERJ-8GEYJ503V

0805 6 Panasonic

ERJ-6GEYJ104V

0805 1 Panasonic

ERJ-6GEYJ510V

P8048SCT-ND

Digi-Key
PCC050CNCT-ND

Digi-Key
PCS1106CT-ND

Digi-Key
P20KKABK-ND

Digi-Key
P50KKABK-ND

Digi-Key
P100KABK-ND

Digi-Key
P510KABK-ND

Digi-Key
P8048SCT-ND

2163-02-ND

P1, P3,P4Shunts 2 mm 3 3M Digi-Key

953170-30-ND

U1 IC, TPA0202, audio

amplifier, 2 W, 2 channel

PCB1

3-18

PCB, TPA0202 EVM 1 TI SLOP202

24 pin

TSSOP

1TI

TP A0202

Details