Texas Instruments TAS5105EVM Manuale utente

TAS5105EVM for the TAS5105 Digital Amplifier

Power Output Stage

User's Guide

Literature Number: SLLU138

January 2011

2SLLU138–January 2011

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1 Related Documentation from Texas Instruments ..................................................................... 5

2 Overview ............................................................................................................................ 5

2.1 TAS5105EVM Features ................................................................................................ 6

2.2 PCB Key Map ............................................................................................................ 6

3 Quick-Setup Guide .............................................................................................................. 6

3.1 Electrostatic Discharge Warning ...................................................................................... 6

3.2 Unpacking the EVM ..................................................................................................... 7

3.3 Power Supply Setup .................................................................................................... 7

3.4 Operational Sequence and Indicators ................................................................................ 8

4 System Interfaces ............................................................................................................... 8

4.1 Power Supply (PSU) Interface (PVDD and GND) .................................................................. 8

4.2 J1 Amplifier Connection to MC016 Controller Module .............................................................. 9

4.3 Loudspeaker Connectors (J3 - J6) .................................................................................... 9

4.4 SPDIF Optical Input Connector ........................................................................................ 9

4.5 SPDIF Coaxial Input Connector ....................................................................................... 9

5 Protection ......................................................................................................................... 10

5.1 Short-Circuit Protection and Fault-Reporting Circuitry ............................................................ 10

5.2 Fault Reporting ......................................................................................................... 10

Appendix A Design Documents ................................................................................................... 11

A.1 MC016 Composite Drawings ........................................................................................ 11

A.2 TAS5105EVM Composite Drawings ............................................................................... 12

A.3 Heat Sink Drawing .................................................................................................... 12

A.4 Parts List ............................................................................................................... 13

SLLU138–January 2011 Table of Contents

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List of Figures

1 Physical Structure for TAS5105EVM .................................................................................... 6

2 Modulator and Power Stage Board Connection Example ............................................................. 7

3 Recommended Power-Up Sequence .................................................................................... 8

List of Tables

1 Related Documentation From Texas Instruments...................................................................... 5

2 Recommended Supply Voltage ........................................................................................... 7

3 Recommended Supply Voltages.......................................................................................... 8

4 J9/J10 Pin Description Amplifier/Controller Connector................................................................. 9

5 Output Pin Description ..................................................................................................... 9

6 TAS5105 Warning/Error Signal Decoding.............................................................................. 10

7 Bill of Materials for TAS5105EVM....................................................................................... 13

8 Bill of Materials for MC016 ............................................................................................... 14

4List of Figures SLLU138–January 2011

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User's Guide

SLLU138–January 2011

TAS5105EVM for the TAS5105 Digital Amplifier Power

Output Stage

This user's guide describes the operation of the TAS5105 evaluation module (EVM) from Texas

Instruments.

1 Related Documentation from Texas Instruments

Table 1 contains a list of data sheets that have detailed descriptions of the integrated circuits used in the

design of the MC016 Modulator/Controller Module which accompanies the TAS5105EVM as well as the

link to the TAS5105 data sheet. These documents can be obtained from the Texas Instruments Web site

at http://www.ti.com.

Table 1. Related Documentation From Texas

Instruments

Part Number Literature Number

TAS5012 SLES006

TAS5105 SLES258

UA78M12CKTPR SLVS059

TPS40200D SLUS659

TPS3825-33DBVT SLVS165

2 Overview

The TAS5105EVM package is composed of two separate modules, the MC016 Modulator/Controller

Module and the TAS5105EVM Amplifier Module. They are designed so that the user can separate the two

modules and connect the TAS5105EVM Amplifier Module into a target system via a ribbon cable. Keep

this ribbon cable as short as possible to avoid degradation in the PWM signals.

The TAS5105 customer evaluation amplifier modules each demonstrate two audio integrated circuits —

the TAS5012 and the TAS5105 from Texas Instruments (TI).

The TAS5012 is a high-performance, 32-bit (24-bit input), multichannel PurePath Digital™ pulse width

modulator (PWM) based on Equibit™ technology with fully symmetrical AD modulation scheme. It accepts

an input sample rate from 32 kHz to 192 kHz.

The TAS5105 is a compact, high-power, digital amplifier power stage designed to drive an 8-Ω

loudspeaker up to 20 W/channel at 10% THD+N. It contains integrated gate-drive, four matched and

electrically isolated enhancement-mode N-channel power DMOS transistors, and protection/fault-reporting

circuitry. The DAD package has a PowerPAD™ package on the top side for heat transfer through a heat

sink. The heat sink in this design is for evaluation purposes only.

The TAS5105 EVM and the MC016 form a complete two-channel, digital audio amplifier system which

includes digital input (S/PDIF) and DAP (digital audio processor) features like digital volume control, bass

management, and input and output multiplexers.

This EVM is designed to illustrate a low-cost approach to an amplifier design using this device.

PurePath Digital, Equibit, PowerPAD are trademarks of Texas Instruments.

SLLU138–January 2011 TAS5105EVM for the TAS5105 Digital Amplifier Power Output Stage

Quick-Setup Guide

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2.1 TAS5105EVM Features

• Modular approach composed of TAS5105EVM Amplifier Modules and MC016 Modulator/Controller

Module

• Two-channel evaluation module

• Self-contained protection system (short-circuit and thermal)

• No programming required

• Double-sided, plated-through printed-circuit board (PCB) layout

• Single power supply operation

NOTE: The TAS5105 and MC016 require no programming, but this means that volume must be

controlled through the SPDIF or ADC source.

2.2 PCB Key Map

Physical structure for the TAS5105EVM is illustrated in Figure 1.

Figure 1. Physical Structure for TAS5105EVM

3 Quick-Setup Guide

This section describes the TAS5105EVM board in regards to power supplies and system interfaces. It

provides information regarding handling and unpacking, absolute operating conditions, and a description

of the factory default switch and jumper configuration.

The section also provides a step-by-step guide to configuring the TAS5105EVM for device evaluation.

3.1 Electrostatic Discharge Warning

Many components on the TAS5105EVM are susceptible to damage by electrostatic discharge (ESD).

Customers are advised to observe proper ESD handling precautions when unpacking and handling the

EVM, including the use of a grounded wrist strap at an approved ESD workstation.

CAUTION

Failure to observe ESD handling procedures can result in damage to EVM

components.

6TAS5105EVM for the TAS5105 Digital Amplifier Power Output Stage SLLU138–January 2011

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Quick-Setup Guide

3.2 Unpacking the EVM

On opening the TAS5105EVM package, ensure that the following items are included:

• 1 pc. TAS5105EVM Power Stage Board

• 1 pc. MC016 Modulator/Controller Board

If any of these items are missing, contact the Texas Instruments Product Information Center nearest you

to inquire about a replacement.

Connect the MC106 Modulator/Controller Board to the TAS5105 Power Stage Board with the docking

connectors on each board. Use care because this connector is not keyed.

Figure 2. Modulator and Power Stage Board Connection Example

3.3 Power Supply Setup

To power up the EVM, one power supply is needed for system power, logic and gate-drive, and for output

stage supply. The power supply is connected to the EVM with banana cables or stripped insulated wire.

Table 2. Recommended Supply Voltage

Description Voltage Limitations Current Requirement Connector

Output stage power supply 8 V – 26 V 5 A Red/black

CAUTION

Applying voltages above the limitations given in Table 2 can cause permanent

damage to your hardware.

SLLU138–January 2011 TAS5105EVM for the TAS5105 Digital Amplifier Power Output Stage

Output stage power supply

RESET

>1 ms

System power supply

System Interfaces

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3.4 Operational Sequence and Indicators

1. Connect the MC016 board to the TAS5105EVM.

2. On the TAS5105 EVM, make sure JP1 and JP3 are in, and JP2 is set to pins 2 and 3.

3. Connect loads to the output of the TAS5105EVM.

4. Connect an SPDIF cable, optical or coaxial, to the MC016 board. Be sure to flip the dipswitch to "RCA"

for coaxial and "OPTO" for optical.

5. Connect the power supply and turn it on.

6. After connecting the power supply and turning it on, the power supply current must read ~50 mA. The

amplifier reset LED must be on. This indicates the board is working and drawing a normal amount of

current.

• The PVDD and 3.3-V LEDs must be on. If not, check the connections to the power supply.

7. Connect the SPDIF cable, either optical or coaxial, to an SPDIF source.

If the preceding conditions are met, the EVM system is ready to accept audio data.

4 System Interfaces

This section describes the TAS5105 EVM board in regards to power supplies and system interfaces.

4.1 Power Supply (PSU) Interface (PVDD and GND)

The TAS5105 EVM module must be powered from a well-regulated external power supply. Good audio

performance requires a stabilized power supply with low ripple voltage and low output impedance.

NOTE: The length of power supply cable must be minimized. Increasing the length of the PSU

cable is equal to increasing the distortion for the amplifier at high output levels and low

frequencies.

Maximum output stage supply voltage depends of the speaker load resistance. For the recommended

maximum supply voltage, see the TAS5105 data sheet (SLES258).

Table 3. Recommended Supply Voltages

Voltage Limitations

Description Current Recommendations

(8-ΩLoad)

Output stage power supply 8 V – 26 V 5 A

The recommended TAS5105 power-up sequence is shown in Figure 3. For proper TAS5105 operation,

the RESET signal should be kept low during power up. RESET is pulled low during power up for 200 ms

by the onboard reset generator (U2).

Figure 3. Recommended Power-Up Sequence

8TAS5105EVM for the TAS5105 Digital Amplifier Power Output Stage SLLU138–January 2011

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System Interfaces

4.2 J1 Amplifier Connection to MC016 Controller Module

Table 4. J9/J10 Pin Description Amplifier/Controller Connector

Net-Name at

Pin No. Description

Schematics

1, 2, 5, 6 ,10, 11, 28 DGND Low-current ground for modulator/controller

3, 4 PVDD1 PVDD buffered through 24-Ωresistor to power the modulator/controller

7 OTW Overtemperature warning from the amplifier (T > 125°C)

8, 9, 13, 15, 17, 19, 20, NC Not connected

21, 22, 23, 25

12 PWM_A Channel A PWM signal from modulator

14 PWM_B Channel B PWM signal from modulator

16 PWM_C Channel C PWM signal from modulator

18 PWM_D Channel D PWM signal from modulator

24 RESET Resets the TAS5105

26 FAULT Power stage fault indicator

27 PVDD 3.3V power supply

4.3 Loudspeaker Connectors (J3 - J6)

CAUTION

Both positive and negative speaker outputs are floating and may not be

connected to ground (e.g., through an oscilloscope).

Table 5. Output Pin Description

Net-Name at Schematics Description

OUT_A Speaker positive output

OUT_B Speaker negative output

OUT_C Speaker positive output

OUT_D Speaker negative output

4.4 SPDIF Optical Input Connector

This connector is a standard TOSLINK connector that connects the SPDIF digital audio input to the SPDIF

receiver on the MC016 PCB. Either the SPDIF optical input connector or the SPDIF coaxial input

connector can be used, but not both connectors at the same time. Switch S1 on the MC016

Modulator/Controller Board controls which connector is used.

4.5 SPDIF Coaxial Input Connector

This connector is a standard RCA connector that connects the SPDIF digital audio input to the SPDIF

receiver on the MC016 PCB. Either the SPDIF coaxial input connector or the SPDIF optical input

connector can be used, but not both connectors at the same time. Switch S1 on the MC016

Modulator/Controller Board controls which connector is used.

SLLU138–January 2011 TAS5105EVM for the TAS5105 Digital Amplifier Power Output Stage

Protection

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5 Protection

This section describes the short-circuit protection and fault-reporting circuitry of the TAS5105 device.

5.1 Short-Circuit Protection and Fault-Reporting Circuitry

The TAS5105 is a self-protecting device that provides fault reporting (including high-temperature

protection and short-circuit protection). For highest possible reliability, recovering from a fault requires

external reset of the device. This is done by the TAS5012 on the MC016 board. See the TAS5105 data

sheet for more information regarding the RESET function.

5.2 Fault Reporting

The OTW and FAULT outputs from TAS5105 indicate fault conditions. See the TAS5105 data sheet

(SLES258) for a description of these pins.

Table 6. TAS5105 Warning/Error Signal Decoding

FAULT OTW Device Condition

0 0 Overcurrent (OC) or undervoltage (UVP) warning or overtemperature error (OTE)

0 1 Overtemperature warning (OTW) or overcurrent (OC) or undervoltage (UVP)

1 0 Junction temperature lower than 125°C and no faults (normal operation)

1 1 Junction temperature higher than 125°C (overtemperature warning)

The FAULT output is open-drain. The OTW output is push-pull active high.

The OTW LED on the MC016 is illuminated when the temperature of the TAS5105 is okay (less than

125°C.) The LED turns off when the TAS5105 is warning of overtemperature on the device (TJ> 125°C.)

This polarity is due to a reversal of polarity of the OTW pin from other devices (e.g., TAS5132) which also

use this modulator board.

10 TAS5105EVM for the TAS5105 Digital Amplifier Power Output Stage SLLU138–January 2011

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