Texas Instruments TPA0103 User manual

TPA0103
Audio Power Amplifier
Evaluation Module
August 1998 Mixed-Signal Products
User’s Guide
SLOU015

IMPORTANT NOTICE
TexasInstruments andits subsidiaries(TI) reservethe rightto makechanges totheir productsor todiscontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TIdeemsnecessarytosupport thiswarranty. Specifictestingof allparametersofeachdevice isnotnecessarily
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, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICALAPPLICATIONS.INCLUSIONOFTIPRODUCTSINSUCHAPPLICATIONSISUNDERSTOODTO
BE FULLY AT THE CUSTOMER’S RISK.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TIassumes noliabilityforapplicationsassistance orcustomer productdesign. TIdoes notwarrantorrepresent
thatanylicense,eitherexpressorimplied,isgrantedunderanypatentright,copyright,maskworkright,orother
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party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright 1998, Texas Instruments Incorporated

iii
Chapter Title—Attribute Reference
Preface
Related Documentation From Texas Instruments
J TI Plug-N-Play Audio Amplifier Evaluation Platform (literature
number SLOU011) provides detailed information on the evaluation
platform and its use with TI audio evaluation modules.
J TPA0103 3-CHANNEL AUDIO POWER AMPLIFIER STEREO
SINGLE-ENDED 500-mW AND MONO BTL 1.75-W
(literature
number SLOS167) This is the data sheet for the TPA0103 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
testedforcompliancewiththelimitsofcomputing devices pursuant to subpart
Jofpart 15ofFCCrules,which aredesignedtoprovidereasonableprotection
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.
Trademarks
TI is a trademark of Texas Instruments Incorporated.

iv

Running Title—Attribute Reference
v
Chapter Title—Attribute Reference
Contents
1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Feature Highlights 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Description 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 TPA0103 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 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Details 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Precautions 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 The TPA0103 Audio Amplifier Evaluation Module 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.1 TPA0103 Audio Amplifier IC 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.2 Output Modes 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.3 Inputs and Gain 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Using The TPA0103 EVM With The Plug-N-Play Evaluation Platform 3-7. . . . . . . . . . . . . .
3.3.1 Installing and Removing EVM Boards 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.2 TPA0103Module Jumper Settings 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.3 Signal Routing 3-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.4 Mode Control 3-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.5 Power Requirements 3-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.6 Inputs and Outputs 3-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4 Using The TPA0103 EVM Stand-ALone 3-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.1 TPA0103 EVM Connected for Center Channel BTL Output 3-16. . . . . . . . . . . . . . .
3.4.2 TPA0103 EVM Connected for Stereo Headphones Output 3-17. . . . . . . . . . . . . . .
3.5 TPA0103 Audio Amplifier Evaluation Module Parts List 3-18. . . . . . . . . . . . . . . . . . . . . . . . .

Running Title—Attribute Reference
vi
Figures
1–1 The TI TPA0103 Audio Amplifier Evaluation Module 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–1 Quick Start Platform Map 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–2 Quick Start Module Map 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–1 The TI Plug-N-Play Audio Amplifier Evaluation Platform 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–2 TPA0103 EVM 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–3 TPA0103 EVM Schematic Diagram 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–4 TPA0103 Audio Amplifier IC 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–5 TPA0103 EVM Jumpers 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 TPA0103 EVM Connected for Center Channel BTL Output 3-16. . . . . . . . . . . . . . . . . . . . . . . .
3–10 TPA0103 EVM Connected for Stereo Headphones Output 3-17. . . . . . . . . . . . . . . . . . . . . . . . .
Tables
2–1 Typical TI Plug-N-Play Platform Jumper and Switch Settings for the TPA0103 2-1. . . . . . . . .
2–2 Typical TPA0103 EVM Jumper Settings 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–3 TI Plug-N-Play Platform Jumper and Switch Settings for the TPA0103 2-3. . . . . . . . . . . . . . .
2–4 TPA0103 EVM Jumper Settings 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–5 TPA0103 EVM Stand-Alone Jumper Settings 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–1 TPA0103 Output Modes 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–2 TPA0103 Output Modes 3-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–3 Typical TPA0103 EVM Jumper Settings for Center Channel BTL Stand-Alone 3-16. . . . . . . .
3–4 Typical TPA0103 EVM Jumper Settings for Stereo Headphones Output 3-17. . . . . . . . . . . . .
3–5 TPA0103 EVM Parts List 3-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1
Introduction
Introduction
This chapter provides an overview of the Texas Instruments (TI) TPA0103
Audio Amplifier Evaluation Module (SLOP103). 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 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Description 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 TPA0103 EVM Specifications 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1

1-2
Introduction

Feature Highlights
1-3
Introduction
1.1 Feature Highlights
The TI TPA0103 Audio Amplifier Evaluation Module and the TI Plug-N-Play
Audio Amplifier Evaluation Platform include the following features:
- TPA0103 Low-Voltage Audio Power Amplifier Evaluation Module
J 535-mW single-ended into 4 Ωat 5 V L/R channels
J 1.75-W bridge-tied load (BTL) into 4 Ωat 5 V center channel
J 3.3-V and 5-V operation
J Low distortion (< 0.25% THD+N at full power)
J Ultra-low current consumption in full shutdown mode
J Two sets of stereo inputs with internal MUX
J Module gain adjustable between approximately 2 and 22
- Quick and Easy Configuration with The TI Plug-N-Play Audio Amplifier
Evaluation Platform
J Evaluation module is designed to simply plug into the platform, auto-
matically 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 Platformprovides quick andeasyaudio input andoutput connections
- Platform Power Options
J Onboard 9-V battery
J External 5-V – 15-V DC VCC supply inputs
J External regulated VDD supply input
J Socket for onboard 5 V/3.3 V VDD voltage regulator EVM
J Onboard 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
J Left and right compression speaker terminal outputs
J Miniature stereo headphone jack output

Description
1-4
Introduction
1.2 Description
The TPA0103 Audio Power Amplifier Evaluation Module is a complete,
low-power three-channel audio power amplifier. It consists of the TI TPA0103
3-Channel Audio Power Amplifier IC along with a small number of other parts
mounted on a circuit board that measures approximately 2 ¼ inches by 1 ½
inches (Figure 1–1).
Figure 1–1.The TI TPA0103 Audio Amplifier Evaluation Module
GND
ROUT+
HP/L*
COUT–
MODE A
SDWN
GND
COUT+
LOUT+
C1
C2
R6
GND
GND
LIN
LHP
C3
R16
C10C9
VDD GND
R9
C7
C6
RHP
RIN
GND
GND S3
S4
S5
R11
C11
+
S2
MODE B
R5
S1
C12
R18
R2
R1
R3
R13
R14
R4
C8
R15 R12
R7R8
R10
C5
TPA0103 EVM
REV. A
Lit.# SLOP103
–3
009228
R17
U1
Single in-line header pins are mounted to the underside of the module circuit
board to allow the EVM to be plugged into the TI Plug-N-Play Audio Amplifier
EvaluationPlatform,ortobewireddirectlyintoexistingcircuitsandequipment
when used stand-alone.
The platform has room for a single TPA0103 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 auto-
matically provides power to the modules, interconnects them correctly, and
connectsthemtoaversatilearrayofstandardaudioinputandoutputjacksand
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.”
1.3 TPA0103 EVM Specifications
Supply voltage range, VDD 3 V to 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply current, IDD 1.5 A, max. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output power, PO: center channel, THD = 0.2%, 4-ΩBTL, VDD=5 V: 1.75 W. . . .
L/R channels, THD = 0.2%, 4-Ω SE, VDD=5 V: 535 mW. . . . . .
L/R channels, THD = 0.2%, 32-Ω SE, VDD=5 V: 100 mW. . . .
Audio input voltage, VI: L/R IN, gain = 2 – 22 BTL 0.75 VPP, max. . . . . . . . . . . . . . . . . .
L/R IN HP, gain = 1 4 VPP, max. . . . . . . . . . . . . . . . . . . . . . . . . .
Minimum load impedance, RL4 Ω. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-1
Quick Start
Quick Start
ThestepsinthischaptercanbefollowedtoquicklypreparetheTPA0103audio
amplifier EVM for use. Using the TPA0103 with the TI Plug-N-Play Audio
AmplifierEvaluationPlatformisaquickandeasywaytoconnectpower,signal
and control inputs, and signal outputs to the EVM using standard connectors.
The audio amplifier evaluation module can also be used stand-alone by
makingconnectionsdirectlytothemodulepins,anditcanbewireddirectlyinto
existing circuits or equipment.
The platform switch and jumper settings shown in Tables 2–1 and the
TPA0103EVMjumpersettingsshowninTable2–2aretypicalfortheTPA0103
EVM.
Table 2–1. Typical TI Plug-N-Play Platform Jumper and Switch Settings for the TPA0103
OUTPUT MODE JP6 JP7 JP8 S2 S3
Center Only OFF X X Note 2 U2-U4
Center or L/R Mode X Hi Note 2 U2-U4
3-Channel OFF X X Note 2 U2-U4
Notes: 1) X = Don’t care, OFF = Open, ON = Closed
2) SetS2toON when signal conditioningboardisinstalledin U1; set S2
to OFF when no signal conditioning board is installed.
Table 2–2. Typical TPA0103 EVM Jumper Settings
OUTPUT MODE S1 S2 S3 S4 S5
Center Only ON ON OFF OFF OFF
Center or L/R ON ON OFF OFF OFF
3-Channel ON OFF OFF OFF OFF
Note: OFF = Open, ON = Closed
Topic Page
2.1 Precautions 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Quick Start List for Platform 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Quick Start List for Stand-Alone 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2

Precautions
2-2
Quick Start
2.1 Precautions
Power Supply Input Polarity and Maximum Voltage
Always ensure that the polarity and voltage of the external power
connected to VCC power input connector J1, J2, and/or VDD power
input connector J6 are correct. Overvoltage or reverse-polarity
power applied to these terminals can open onboard soldered-in
fuses and cause other damage to the platform, installed evaluation
modules, and/or the power source.
Inserting or Removing EVM Boards
DonotinsertorremoveEVM boards with power applied — damage
to the EVM board, the platform, or both may result.
Figure 2–1. Quick Start Platform Map
3
Signal Conditioning
****CAUTION****
Do not insert or remove
EVM boards with power
applied
ICC
JP4
F1
VR1
R1
JP3 JP2 JP1 AC/DC
(J2)
VCC(J1)
D1 D2 D3
D4 J2
J3 J4 J5
AC/DC
In
VCC
In
+
J1
DC
SOURCE
LED1 VCC
LED2 VDD
R2
JP5 IDD
B1
U6
POWER
SUPPLY
U3 U4
U5
U1
U2
Audio
Power
Amps
OnOff ConditioningS2
J7 J8 Right
Out Left
Out
+– +–
JP6
Mode
Mute
Spk(U2-U4)
JP8
J9 Left
Out
JP7
S3 HP Source
U2-U4
U5
Polarity
Lo
Hi
HP(U5)
C3 C2
++
R3
R4 R5
J10
Stereo
HP Out
TP1
GND
Plug-N-PlayAudio Amplifier
Evaluation Platform
SLOP097 Rev. C.1
Stereo
In
Right
In Left
In
J6 In/Out VDD
F2
VR2
+
DC
Power
In/Out
Speaker
Output
Headphone
Output
Audio
Input
Power
Input
Batt
C1+
Right
Out
On Off Pwr
S1
TEXAS INSTRUMENTS 1997
110
9
8
6b
6b
6a
6b
4
4
6b
244

Quick Start List for Platform
2-3
Quick Start
2.2 Quick Start List for Platform
Follow these steps when using the TPA0103 EVM with the TI Plug-N-Play
AudioAmplifierEvaluationPlatform(seetheplatformuser’sguide,SLOU011,
for additional details). Numbered callouts for selected steps are shown in
Figure 2–1 and details appear in Chapter 3.
- Platform and TPA0103 EVM preparations
1) Ensurethatallexternalpowersourcesaresetto
OFF andthattheplatform
power switch S1 is set to
OFF.
2) Install a TPA0103 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).
Setting the platform and the EVM for Center or L/R, as indicated in the tables
below, will causethe EVM tooperate in thecenter channel modeBTL (speak-
er)whennoplugispresentinheadphonejackJ10andintheL/Rsingle-ended
mode(headphone) when a plug isinserted into platform headphone jackJ10.
4) Set the jumpers on the platform as indicated in Table 2–3.
Table 2–3. TI Plug-N-Play Platform Jumper and Switch Settings for the TPA0103
OUTPUT MODE JP6 JP7 JP8 S2 S3
Center or L/R Mode X Hi Note 2 U2-U4
Notes: 1) X = Don’t care
2) SetS2toON when signal conditioningboardisinstalledin U1; set S2
to OFF when no signal conditioning board is installed.
5) Set the jumpers on the TPA0103 EVM as indicated in Table 2–4.
Table 2–4. TPA0103 EVM Jumper settings
OUTPUT MODE S1 S2 S3 S4 S5
Center or L/R ON ON OFF OFF OFF
Note: OFF = Open, ON = Closed
- Power supply
6) Select and connect the power supply:
a) Connectanexternalregulatedpowersupplysetto a voltage between
3 V and 5.5 V to platform VDD power input connector J6 taking care
to observe marked polarity, or
b) InstallavoltageregulatorEVM(SLVP097orequiv.)inplatformsocket
U6. Install a 9-V battery in B1 or connect a 7 V – 12 V power source
to a platform VCC power input J1 or J2 and jumper the appropriate
power input (see platform user’s guide).
- Inputs and outputs
7) Ensure that signal source level adjustments and the EVM gain controls,
R13, R14, and R17, are set to minimum.
8) Connect the audio source to left and right RCA phono jacks J3 and J5 or
stereo miniature phone jack J4.
9) Connect a 4-Ωto 8-Ωspeaker to the left and right
BLACK speaker
connectors of J8.
DO NOT USE RED CONNECTORS OF J8.
- Power-up
10) Verify correct voltage and inputpolarity and setthe external power supply
to
ON. IfVCC and anonboardregulatorEVMareusedto provideVDD,set
platform power switch S1 to
ON.
11) Adjust the signal source level and EVM gain levels (R13, R14, and R17)
as needed.

Quick Start List for Stand-Alone
2-4
Quick Start
2.3 Quick Start List for Stand-Alone
Follow these steps to use the TPA0103 EVM stand-alone or connect it into
existing circuits or equipment. Connections to the TPA0103 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 2–2 and details appear in
Chapter 3.
Figure 2–2. Quick Start Module Map
GND
ROUT+
HP/L*
COUT–
MODE A
SDWN
GND
COUT+
LOUT+
C1
C2
R6
GND
GND
LIN
LHP
C3
R16
C10C9
VDD GND
R9
C7
C6
RHP
RIN
GND
GND S3
S4
S5
R11
C11
+
S2
MODE B
R5
S1
C12
R18
R2
R1
R3
R13
R14
R4
C8
R15 R12
R7R8
R10
C5
TPA0103 EVM
REV. A
Lit.# SLOP103
–3
009228
43
R17
U1
- Power supply
1) Ensure that all external power sources are set to
OFF.
2) Connectanexternalregulatedpower supply setto5VtothemoduleVDD
and GND pins taking care to observe marked polarity.
- TPA0103 EVM jumpers
Setting the EVM for Center or L/R as indicated in the table below will cause
the EVM to operate in the center channel BTL mode (speaker).
3) Set the jumpers on the TPA0103 EVM as indicated in Table 2–5.
Table 2–5. TPA0103 EVM Stand-Alone Jumper settings
EVM OUTPUT MODE S1 S2 S3 S4 S5
Center or L/R ON ON OFF OFF OFF
Note: OFF = Open, ON = Closed
- Inputs and outputs
4) Ensure that signal source level adjustments and EVM gain controls, R13,
R14, and R17, are set to minimum.
5) Connect the audio source to the module IN+ and GND pins, taking care
to observe marked polarity.
6) Connect the SDWN pin to VDD through a Normally Open switch.
7) Connect a 4-Ωto 8-Ωspeaker to the module COUT+ and COUT– pins.
- Power-up
8) Verify correct voltage and inputpolarity and setthe external power supply
to
ON.
9) Adjust the signal source level and EVM gain levels as needed.

3-1
Details
Details
This chapter provides details on the TPA0103 IC, the evaluation module, and
thestepsintheQuick-StartList,additionalapplicationinformation,andaparts
list for the TPA0103 evaluation module.
Topic Page
3.1 Precautions 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 The TPA0103 Audio Power Amplifier Evaluation Module 3–3. . . . . . . . .
3.3 Using the TPA0103 EVM With the Plug-N-Play
Evaluation Platform 3–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4 Using The TPA0103 EVM Stand-Alone 3–16. . . . . . . . . . . . . . . . . . . . . . . .
3.5 TPA0103 Audio Power Amplifier Evaluation Module Parts List 3–18. .
Chapter 3

Precautions
3-2
Details
3.1 Precautions
Power Supply Input Polarity and Maximum Voltage
Always ensure that the polarity and voltage of the external power
connected to VCC power input connector J1, J2, and/or VDD power
input connector J6 are correct. Overvoltage or reverse-polarity
power applied to these terminals can open onboard soldered-in
fuses and cause other damage to the platform, installed evaluation
modules, and/or the power source.
Inserting or Removing EVM Boards
DonotinsertorremoveEVM 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
Signal Conditioning
****CAUTION****
Do not insert or remove
EVM boards with power
applied
ICC
JP4
F1
VR1
R1
JP3 JP2 JP1 AC/DC
(J2)
VCC(J1)
D1 D2 D3
D4 J2
J3 J4 J5
AC/DC
In
VCC
In
+
J1
DC
SOURCE
LED1 VCC
LED2 VDD
R2
JP5 IDD
B1
U6
POWER
SUPPLY
U3 U4
U5
U1
U2
Audio
Power
Amps
OnOff ConditioningS2
J7 J8 Right
Out Left
Out
+– +–
JP6
Mode
Mute
Spk(U2-U4)
JP8
J9 Left
Out
JP7
S3 HP Source
U2-U4
U5
Polarity
Lo
Hi
HP(U5)
C3 C2
++
R3
R4 R5
J10
Stereo
HP Out
TP1
GND
Plug-N-PlayAudio Amplifier
Evaluation Platform
SLOP097 Rev. C.1
Stereo
In
Right
In Left
In
J6 In/Out VDD
F2
VR2
+
DC
Power
In/Out
Speaker
Output
Headphone
Output
Audio
Input
Power
Input
Batt
C1+
Right
Out
On Off Pwr
S1
TEXAS INSTRUMENTS 1997

The TPA0103 Audio Power Amplifier Evaluation Module
3-3
Details
3.2 The TPA0103 Audio Power Amplifier Evaluation Module
The TPA0103 Audio Power Amplifier Evaluation Module is powered by a
TPA0103 3-channel audio power amplifier capable of delivering 535 mW of
continuouspowertoeachoftheleftandrightsingle-ended4-Ωspeakerloads,
and 1.75 W of continuous power (BTL) to a center channel 4-Ωload. The
amplifierICcanbeconfigured for centerchannelonly,centerorL/Rchannels,
or three channel operation via two mode terminals. The evaluation module
includes jumpers for setting modes and control inputs for shutdown, selection
between two sets of stereo inputs, and switching between 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 stand-
alone.
The module appears in Figure 3–2 and its schematic is shown in Figure 3–3.
Figure 3–2.TPA0103 EVM
GND
ROUT+
HP/L*
COUT–
MODE A
SDWN
GND
COUT+
LOUT+
C1
C2
R6
GND
GND
LIN
LHP
C3
R16
C10C9
VDD GND
R9
C7
C6
RHP
RIN
GND
GND S3
S4
S5
R11
C11
+
S2
MODE B
R5
S1
C12
R18
R2
R1
R3
R13
R14
R4
C8
R15 R12
R7R8
R10
C5
TPA0103 EVM
REV. A
Lit.# SLOP103
–3
009228
R17
U1

The TPA0103 Audio Power Amplifier Evaluation Module
3-4
Details
Figure 3–3.TPA0103 EVM Schematic Diagram
GND/HSGND/HS
S2
NCNC
ROUT+LOUT+
RLINE INLLINE IN
HP/LINEMUTE OUT
COUT–COUT+
MODE AMODE B
GND/HSGND/HS
RHP INLHP IN
RBYPASSCIN
VDD VDD
NCSHUTDOWN
10
9
12
11
6
5
8
7
2
1
4
3
23
22
21
20
19
18
17
16
15
14
13
24
R6
100 kΩ
R4
20 kΩ
R3
20 kΩ
C2
1 µF
C1
1 µFR1
20 kΩ
R2
20 kΩ
C3
5 pF
VDD
R5
100 kΩ
C5
2.2 µF
S1
COUT+
MODE B
LIN
LINHP
VDD
LOUT+
R10
20 kΩC7
1 µF
C9
2.2 µF
R9
20 kΩ
C8
5 pF
C6
1 µF
R8
20 kΩ
S3
LVDD
S4
VDD
ROUT+
RIN
RINHP
VDD
COUT–
MODE A
S5
C10
2.2 µFC11 10 µF
R13
200 kΩ
R15, 20 kΩ
R18
20 kΩ
R17
200 kΩ
C12
5 pF
R16
20 kΩ
R7
20 kΩ
R14
200 kΩ
GND
R11
100 kΩ
R12, 100 kΩ
TPA0103
HP/L*
3.2.1 TPA0103 Audio Amplifier IC
The TPA0103 audio amplifier IC is a low-voltage CMOS device intended
primarily for desktop and notebook PCs. In the typical application, the center
channel amplifier is driven from a mix of the L/R inputs to produce a monaural
representation of the stereo signal. The center channel amplifier can be shut
down independently of the L/R output for speaker muting in headphone
applications. The TPA0103 also features a full shutdown function for power
sensitive applications reducing current consumption to 5 µA. It is supplied in
a very small 24-pin TSSOP thermal surface-mount package and has been
designedtooperatefromlowsupplyvoltages(betweenapproximately3Vand
5.5V)anddeliverfullpoweratdistortionlevelsoflessthan0.25%THD+Nfrom
a 5-V supply (Figure 3–4).

The TPA0103 Audio Power Amplifier Evaluation Module
3-5
Details
Figure 3–4.TPA0103 Amplifier IC
MODE A
MODE B
SHUTDOWN
CNTL
MUX
MUX
CNTL
L Line IN
L HP IN
R Line IN
R HP IN
C IN
C OUT+
C OUT–
R OUT+
L OUT+
TPA0103
HP/Line
The IC includes three separate amplifier channels: a left and right stereo pair
(single-ended)andabridged-tiedload(BTL)centerchannel.IntheBTLmode,
thetwooutputlinesofthecenterchanneloperate180°out-of-phasewitheach
other for increased power. The center channel speaker load is connected
directly across COUT+ and COUT–, 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.
The left and right stereo channels operate in the single-ended mode, the
speaker load is connected between the OUT+ terminal through an output
couplingcapacitor, to system ground. For moreinformation,seetheTPA0103
amplifier IC data sheet, TI Literature Number SLOS167.
3.2.2 Output Modes
The TPA0103 amplifier operates in any of three output modes or mutes
according to the status of the two control terminals MODE A and MODE B as
shown in Table 3–1.
Table 3–1. TPA0103 Output Modes
TERMINAL 3-Channel Mute Center Only L/R Only
MODE A L H L H
MODE B L L H H
Note: L = logic low, H = logic high

The TPA0103 Audio Power Amplifier Evaluation Module
3-6
Details
3.2.3 Inputs and Gain
Theleftandrightsingle-endedchannelsremain separatefrominputtooutput.
On the TPA0103 EVM board, the left and right channel inputs are mixed to
produce a monaural representation of the stereo signal and applied to the
amplifier IC center channel input.
Each of the left and right channels has two separate signal inputs. They are
called
line and headphone ( HP ) and are pin-selectable. The line inputs and
the center channel input are adjustable between approximately 2 and 22, and
theheadphoneinputsarefixedatagainof1.Inthetypicalapplicationinwhich
the TPA0103 powers left and right speakers until headphones are plugged in,
the line input gain can be set so that the two inputs provide 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 IC pin.
TheTPA0103amplifierIC,likemostotheramplifiers,exhibitsitsbestdistortion
and noise performance at lower gain levels (see the TPA0103 data sheet).
Gain versus total harmonic distortion (THD) should be considered in each
application. Both the module input signal level and the TPA0103 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
inputsignallevelshould be ashighaspossiblewithoutclippingor overloading
the TPA0103 input, and the TPA0103 gain should be kept as low as possible.