Texas Instruments TPA731 MSOP Manuale utente

November 2000 Mixed-Signal Products

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 

User’s Guide

SLOU088

IMPORTANT NOTICE

TexasInstrumentsanditssubsidiaries(TI)reservetherighttomakechangestotheirproductsortodiscontinue

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 acknowledgment, 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

TIdeemsnecessarytosupportthiswarranty. Specifictestingofallparametersofeachdeviceis not necessarily

performed, except those mandated by government requirements.

Customers are responsible for their applications using TI components.

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.

TIassumesnoliabilityforapplicationsassistance or customer product design. TI does not warrantorrepresent

thatanylicense,eitherexpressorimplied,isgrantedunderanypatentright,copyright,maskworkright,orother

intellectual property right of TI covering or relating to any combination, machine, or process in which such

semiconductor products or services might be or are used. TI’s publication of information regarding any third

party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.

Information About Cautions and Warnings

iii

Read This First

Preface

Read This First

Information About Cautions and Warnings

This book may contain cautions and warnings.

This is an example of a caution statement.

A caution statement describes a situation that could potentially

damage your software or equipment.

This is an example of a warning statement.

A warning statement describes a situation that could potentially

cause harm to you.

The information in a caution or a warning is provided for your protection.

Please read each caution and warning carefully.

Related Documentation From Texas Instruments



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.



TPA731 700-mW Low-Voltage Audio Power Amplifier

(literature

number SLOS315) This is the data sheet for the TPA731 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

testedfor compliance with thelimitsof computing devices pursuanttosubpart

Jofpart 15of FCCrules, whicharedesignedtoprovidereasonableprotection

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.

Running Title—Attribute Reference

Contents

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

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

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

1.3 TPA731 EVM Specifications 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Operation 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4 Reference 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4.1 TPA731 MSOP EVM Connected for BTL Output 2-5. . . . . . . . . . . . . . . . . . . . . . . . .

2.4.2 TPA731 MSOP EVM Schematic Diagram 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4.3 TPA731 MSOP Audio Power Amplifier Evaluation Module Parts List 2-6. . . . . . . .

2.4.4 TPA731 MSOP EVM PCB Layers 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figures

1–1 The TI TPA731 Audio Amplifier Evaluation Module 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

2–2 Quick Start Module Map 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–3 TPA731 MSOP EVM Connected for Stereo BTL Output 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–4 TPA731 MSOP EVM Schematic Diagram 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–5 TPA731 EVM PCB 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–6 TPA731 EVM Silkscreen 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–7 TPA731 EVM Top Layer 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–8 TPA731 EVM Bottom Layer 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

2–1. Typical TI Plug-N-Play Platform Jumper and Switch Settings for the TPA731

MSOP EVM 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–2. Platform Jumper and Switch Settings for the TPA731 MSOP EVM 2-3. . . . . . . . . . . . . . . . . . . . .

2–3. TPA731 MSOP EVM Parts List 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

Introduction

This chapter provides an overview of the Texas Instruments (TI) TPA731

MSOPaudio amplifierevaluationmodule(SLOP342). It includes alistofEVM

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 TPA731 MSOP EVM Specifications 1–3. . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 1

Feature Highlights

1-2

Introduction

1.1 Feature Highlights

The TI TPA731 MSOP audio amplifier evaluation module and the TI

plug-n-play audio amplifier evaluation platform include the following features:

TPA731 low-voltage audio power amplifier evaluation module

Single channel, bridge-tied load (BTL)

2.5-V and 5.5-V operation

700-mW output power into 8 Ωat 5 V, BTL

Ultra-low current consumption in shutdown mode

Internal thermal and short-circuit protection

Module gain is set at –4 V/V in BTL mode, –2 V/V in SE mode

Quick and Easy Configuration With The TI Plug-N-Play Audio Amplifier

Evaluation Platform

Evaluation module is designed to simply plug into the platform,

automatically making all signal, control, and power connections

Platform provides flexible power options

Jumpers on the platform select power and module control options

Switches on the platform route signals

Platformprovides quick and easy audio inputand output connections

Platform Power Options

Onboard 9-V battery

External 5-V–15-V (VCC) supply inputs

External regulated VDD supply input

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

Onboard overvoltage and reverse polarity power protection

Platform Audio Input and Output Connections

Left and right RCA phono jack inputs

Miniature stereo phone jack input

Left and right RCA phono jack outputs

Left and right compression speaker terminal outputs

Miniature stereo headphone jack output

Description

1-3

Introduction

1.2 Description

The TPA731 MSOP audio power amplifier evaluation module is a complete,

low-power single-channel audio power amplifier. It consists of the TI TPA731

700-mWlow-voltage audiopower amplifierICin averysmall MSOPpackage,

along with a small number of other parts mounted on a circuit board that is

approximately one and a quarter inches square (see Figure 1–1).

Figure 1–1.The TI TPA731 Audio Amplifier Evaluation Module

OUT+

IN–

GND

VDD GND

U1 †

Shutdown

OUT–

GND

TEXAS

INSTRUMENTS

SLOP342

TPA731 MSOP EVM

S1 R1

†Due to the very small size of the MSOP IC package, the standard part number TPA731 is

replaced with the code TAJC.

Single in-line header pins are mounted to the underside of the module circuit

board. These pins 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, with room for a pair of TPA731 MSOP evaluation modules, 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,

andconnectsthemtoaversatilearrayofstandardaudioinputandoutputjacks

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.

1.3 TPA731 EVM Specifications

Supply voltage range, VDD 2.5 V to 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Supply current, IDD 450 mA, max. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous output power, PO:8-ΩBTL, VDD = 5 V 700 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Audio input voltage, VI2 Vpp, max. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Minimum load impedance, RL8 Ω. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-4

Introduction

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