Texas Instruments TAS5110D6REF User Manual

TAS5110D6REF

Reference Design for the TAS5110DAD Digital Audio PWM Power Output Stage

User’s Guide

July 2003 Digital Audio/Application

SLEU032

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It is important to operate this EVM within the specified input and output ranges described in the EVM User’s Guide.

Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the input power.

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About This Manual

This manual describes the operation of the TAS5110D6REF evaluation module from Texas Instruments.

How to Use This Manual

Information About Cautions and Warnings

Preface

Read This First

This document contains the following chapters:

- Chapter 1 – Introduction

- Chapter 2 – System Interfaces

- Chapter 3 – Electrical Specifications and Typical Characteristics Graphs

- Chapter 4 – Schematic, Parts List, PCB Specification, and PCB Layout

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.

iii

Related Documentation From Texas Instruments

The following is a list of data manual that have detailed descriptions of the integrated circuits used in the design of the TAS5110D6REF evaluation module. The data manuals can be obtained at the URL http://www.ti.com

Part Number Literature Number

TAS5110A SN74LVC2G126DCT TPS75333QPWP

SLES079 SCES205 SLVS241

Contents

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

1.1 TAS5110D6REF Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 PCB Key Map 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Short-Circuit Protection and Fault Reporting Circuitry 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3.1 Device Fault Reporting 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3.2 Short-Circuit Protection 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3.3 Autorecovery System 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 System Interfaces 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 PSU Interface (J150) 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 PSU Control Interface (J160) 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Loudspeaker Connectors (J240, J280, J340, J380, J440, and J480) 2-3. . . . . . . . . . . . . . .

2.4 PWM Interface (J100) 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Electrical Specifications and Typical Characteristics Graphs 3-1. . . . . . . . . . . . . . . . . . . . . . .

3.1 T AS5110D6REF Electrical Specifications 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 Physical Specifications 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3 Typical Characteristics Graphs 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Schematic, Parts List, PCB Specification, and PCB Layout 4-1. . . . . . . . . . . . . . . . . . . . . . . . .

Contents

Figures

1–1 TDAA System With TAS5026REF/TAS5036 and TAS5110D6REF Modules 1-2. . . . . . . . . . .

1–2 Physical Structure for the TAS5110D6REF (Rough Outline) 1-3. . . . . . . . . . . . . . . . . . . . . . . . .

1–3 Auto Recovery Loop 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1 Recommended T AS5110 Power-Up Sequence 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–2 Pin Numbers at the PSU Interface (Top View) 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–3 Pin Numbers at the PSU Control Interface 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–4 Pin Numbers at the Loudspeaker Connectors 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–5 Pin Numbers at PWM Interface (J100) 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–1 THD+N vs Frequency – Channel 1 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–2 THD+N vs Power – Channel 1, 3, and 5 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–3 THD+N vs Power – Channel 2, 4, and 6 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–4 FFT With –60 dB Input Signal – Channel 1 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–5 FFT at 40-W Output Power – Channel 1 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–6 Noise Floor – Channel 1 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–7 Channel Separation vs Frequency – Channel 1 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–8 Frequency Response – Channel 1 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

1–1 Device Fault Reporting 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1 J150 Pin Description 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–2 PSU Control Interface Pin Connections 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–3 Description of Loudspeaker Connectors 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–4 J100 Pin Description 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 1

Introduction

The true digital audio amplifiers (TDAA) system consists of a PCM–PWM modulator device and a PWM power output device. The PCM–PWM processor accepts a serial PCM digital audio stream and converts it to a 3.3-V PWM audio stream. The TDAA output stage provides a large-signal PWM output. The digital PWM signal is then demodulated providing power output for driving loudspeakers. This patented technology provides low cost, high quality, high efficient digital audio applicable to many audio systems developed for the digital age.

The TAS5110D6REF reference design demonstrates the integrated circuit TAS5110DAD from Texas Instruments (TI). The board does not contain any PWM processors. A separate and compatible PWM processor board (such as TAS5026REF) is available.

The TAS5110 is a single channel PWM power audio device. It contains integrated gate drivers, four matched and electrically isolated enhancement-mode N-channel power DMOS transistors, and protection and fault-reporting circuitry. This device is optimized for use with the TAS50XX PWM processor family.

Together with the TAS5026REF module or the TAS5036REF module, the TAS5110D6REF module is a complete true digital audio amplifier system, which includes digital volume control, headphone amplifier, and a subwoofer output.

Topic Page

1.1 T AS5110D6REF Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 PCB Key Map 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Short-Circuit Protection and Fault Reporting Circuitry 1-4. . . . . . . . . . .

1-1

T AS5110D6REF Features

1.1 TAS5110D6REF Features

- Six channel TDAA reference design (double-sided plated-through PCB

layout)

- Supports noiseless self-contained protection system (short circuit and

thermal)

- Supports both two-level modulation (AD-modulation scheme) and three-

level modulation (BD-modulation scheme)

- Onboard subwoofer output (line level)

Figure 1–1.TDAA System With TAS5026REF/TAS5036 and TAS5110D6REF Modules

Digital Audio

Interface

Control

Interface

I2C Bus

Control Interface

TAS5026REF/TAS5036REF

Module

PWM Interface

TAS5110D6REF

Module

The TAS5026 processor is a two-level PCM-to-PWM modulator and the TAS5036 processor is a three-level modulator.

1-2

1.2 PCB Key Map

The physical structure for the TAS5110D6REF is illustrated in Figure 1–2.

Figure 1–2.Physical Structure for the TAS5110D6REF (Rough Outline)

PCB Key Map

J150

PSU Interface

J160

Interface

PSU Control

3.3-V Linear

LED Indicators

Left Front Speaker

Output Stage Channel 1

Regulator

J240, J280, J340, J380, J440, and J480

Loudspeaker Outputs

Right Front Speaker

Output Stage Channel 2

Left Rear Speaker

Output Stage Channel 3

TAS5110D6REF

J100

PWM Interface

Right Rear Speaker

Output Stage Channel 4

Center Speaker

Output Stage Channel 5

J110

Subwoofer Output

(Line Level)

Subwoofer

Output Stage Channel 6

Introduction

1-3

PCB Key Map

1.3 Short-Circuit Protection and Fault Reporting Circuitry

The TAS5110 is a self-protecting device that provides device fault reporting (including over-temperature protect and short-circuit protection).

1.3.1 Device Fault Reporting

The ERR0, ERR1, and SHUTDOWN outputs from TAS5110 indicates the device conditions shown in Table 1–1. The device fault reporting outputs are open-drain outputs.

Table 1–1.Device Fault Reporting

SHUTDOWN ERR0 ERR1 DEVICE CONDITION

0 0 0 Illegal PWM input state 0 0 1 Short-circuit protect 0 1 0 Over temperature protect 0 1 1 Low regulator voltage protect 1 0 0 Reserved 1 0 1 Reserved 1 1 0 High temperature warning 1 1 1 Normal operation

1.3.2 Short-Circuit Protection

The short-circuit protect error condition latches the T AS5110 in the shutdown mode:

- H-bridge outputs (OUTPUTA and OUTPUTB) are in a high-impedance

state (Hi-Z state).

- SHUTDOWN is asserted low.

- ERR0 is high and ERR1 is asserted low.

- The H-bridge outputs remains in a Hi-Z state until the device is reset

(RESET

The TAS5110 is not designed for driving load impedance less than 4 Ω (at 20-Vdc output stage supply), where the internal current limit protection is activated at high power levels.

1.3.3 Auto Recovery System

Together with a PWM processor from Texas Instruments (e.g., the TAS5026 or the TAS5036), the TAS5110 can be configured in autorecovery mode. The SHUTDOWN ERR_RCVY

pin asserted low).

signal from the T AS5110 is in autorecovery mode connected to

at the PWM processor.

1-4

The short-circuit protect error condition results in the following autorecovery sequence:

- H-bridge outputs (OUTPUTA and OUTPUTB) are in a high-impedance

state (Hi-Z state).

- ERR_RCVY at the PWM processor is forced low by the SHUTDOWN

signal.

- RESET at the TAS5110 is forced low by the VALID signal.

- The VALID signal goes high after 4 ms and then the TAS5110 starts

switching again.

Figure 1–3.Auto Recovery Loop

PCB Key Map

EXTERNAL_ERR_RCVY

SHUTDOWN-FILTERED

AND Gate

ERR_RCVY

Buffer

PWM Processor

Low-Pass Filter

VALID

RESET

TAS5110

SHUTDOWN

The autorecovery loop is closed when the TAS5110D6REF board is connected to the TAS5026REF or TAS5036REF module.

Introduction

1-5

1-6

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