Texas Instruments TPA3123D2 Manuale utente

User's GuideSLOU208 – August 2007

TPA3123D2 Audio Power Amplifier EVM

Contents1 Introduction ................................................................................................................... 22 Operation ..................................................................................................................... 43 TPA3123D2 EVM Schematic............................................................................................... 54 TPA3123D2 EVM PCB Layers ............................................................................................. 65 TPA3123D2 Evaluation Module Parts List ............................................................................... 8

List of Figures

1 TPA3123D2 Audio Power Amplifier EVM (Top View) ................................................................... 22 TPA3123D2 Audio Power Amplifier EVM (Bottom View) ............................................................... 33 TPA3123D2 EVM Schematic............................................................................................... 54 Top Side Layout.............................................................................................................. 65 Bottom Side Layout .......................................................................................................... 7

List of Tables

1 TPA3123D2 EVM Specifications .......................................................................................... 22 Gain Settings ................................................................................................................. 43 TPA3123D2 EVM Bill of Materials ......................................................................................... 8

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1 Introduction

Introduction

The TPA3123D2 evaluation module consists of a single 25-W, class-D, stereo audio power amplifiercomplete with a small number of external components mounted on a circuit board that are used to directlydrive speakers with an external analog audio source as the input.

Table 1. TPA3123D2 EVM Specifications

VALUE UNIT

Supply voltage range 10 to 30 VI

Supply current, maximum 2 AP

Continuous output power, P

: 4 Ω, V

= 27 V, THD+N = 10% 24 WZ

Minimum load impedance 3.2 Ω

Figure 1. TPA3123D2 Audio Power Amplifier EVM (Top View)

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Introduction

Figure 2. TPA3123D2 Audio Power Amplifier EVM (Bottom View)

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2 Operation

2.1 Quick Start List for Stand-Alone Operation

2.1.1 Power Supply

2.1.2 Evaluation Module Preparations

Operation

Follow these steps to use the TPA3123D2EVM stand-alone or when connecting it into existing circuits orequipment. Connections to the EVM module can be made by inserting stripped wire, or using bananaplugs for the power supply and output connections. The inputs accept standard RCA plugs.

1. Ensure that all external power sources are set to OFF.2. Connect an external regulated power supply adjusted from 10 V to 30 V to the module VCC (J7) andGND (J8) banana jacks taking care to observe marked polarity.

Inputs and Outputs:1. Connect an audio source to the input jacks, J9 and J10.2. Connect a speaker across GND (J5) and +ROUT (J6). Connect another speaker across LOUT (J3)and GND (J4)3. Install both gain jumpers GAIN0 (J1) and GAIN1 (J2). This sets the gain of the amplifier to the lowestlevel, 20 dB.

Control Inputs:1. SHUTDOWN: This terminal is active LOW. A LOW on the device terminal (<0.8 V) shuts down theamplifier; a HIGH (>2 V) on the device terminal places the amplifier in the active state. Holding downswitch SW1 places the amplifier in the SHUTDOWN state. Releasing SW1 returns the amplifier to theactive state. This terminal is V

compliant.2. MUTE: This terminal is active HIGH. A HIGH (>2 V) on this terminal will immediately terminate audioplayback through the speakers; a LOW (<0.8 V) enables the device. The outputs remain switching withfifty percent duty cycle. SW2 on the EVM controls the state of the MUTE terminal. Holding down switchSW2 places the amplifier in the MUTE state. Releasing SW2 returns the amplifier to the active state.This terminal is V

compliant.3. GAIN0/GAIN1: Together, these terminals determine the gain of the amplifier. See Table 2 . Installing ajumper in J1 or J2 sets the respective terminal to GND. Removing the jumper sets the respectiveterminals to VCC. Removing jumpers increases the gain while installing jumpers decreases the gain.Logic levels are TTL compatible. These terminals are V

compliant.4. Power-off Depop Circuit: Additional circuitry to quiet power-off pop is provided on the EVM. Thiscircuit consists of shunt regulator D1, bipolar transistor Q4, and the surrounding components. Thiscircuit is activated by installing the jumper J11 which connects V

to the network. The depop circuithas two different modes of operation. When R13 is installed, this circuit slowly pulls down the voltageon the Bypass pin when power is removed resulting in a controlled reduction of the Class D outputduty cycle. If R17 is installed, the network reduces the pop by pulling down the shutdown pin atpower-off. This approach can be used if the power supply operates in such a way that there is asignificant time delay between removal of power and the point where V

falls below the chip UVLOlevel, which is approximately 8 volts.

Table 2. Gain Settings

GAIN0 (J1) GAIN1 (J2) Amplifier Gain (dB)

ON ON 20ON OFF 26OFF ON 32OFF OFF 36

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2.1.3 Power Up

3 TPA3123D2 EVM Schematic

RIGHT_OUT

LEFT_IN

RIGHT_IN

LEFT_OUT

VCC

C9 open

C16 open

Circuit inside dotted line is

for power down de-pop

improvement.

10K

-LOUT

TP4TP4

SW1

SHUTDOWN

SW1

SHUTDOWN

U1U1

TPA3123

PVCCL

MUTE

LIN

RIN

BYPASS

AGND

PVCCR

VCLAMP

PVCCR

12 PGNDR 13

PGNDR 14

ROUT 15

BSR 16

GAIN1 17

GAIN0 18

AVCC 19

AVCC 20

BSL 21

LOUT 22

PGNDL 23

PGNDL 24

THERMAL

C14

0.1uF C14

0.1uF

TP5TP5

4.75K

22uH

VCC

R12

10K

R12

10K

1.0uF C6

1.0uF

Dl4148

10K

C18

0.01uF

C18

0.01uF

R17 open

TP12

RGND

TP12

RGND

SW2

MUTE

SW2

MUTE

TP3TP3

C12 0.22uFC12 0.22uF C9

1.0uF

R16

20K

R16

20K

4.75K

470uF

GND

TP2TP2

J10

RIN

J10

RIN

4.75K

LIN

R18

10K

R18

10K

C10

470uF

C10

470uF

1 2

J11J11

TP10

GND

TP10

GND

C16

1.0uF

C16

1.0uF

10K

C15 0.22uFC15 0.22uF

R13

150K

R13

150K

TP7

RIGHT_OUT

TP7

RIGHT_OUT

-ROUT

GAIN0

C17

470uF

C17

470uF

1 2

1.0uF

R15 open

+LOUT

TP11

LGND

TP11

LGND

TP1

LEFT_IN

TP1

LEFT_IN

C19

0.68uF

C19

0.68uF

10K

MMBT3904

470uF

+ROUT

R10

C11 open

10pF

C11 open

10pF

C21 open

10pF

C13

10uF C13

10uF

1.0uF

GAIN1

C7 0.1uFC7 0.1uF

C20

0.68uF

C20

0.68uF

TP6

LEFT_OUT

TP6

LEFT_OUT

R11

2.49K

R11

2.49K

10K

R19

10K

TLV431ACDBZR

C1 0.1uFC1 0.1uF

TP9

INPUT_GND

TP9

INPUT_GND

TP8

RIGHT_IN

TP8

RIGHT_IN

22uH

1.0uF C5

1.0uF

TPA3123D2 EVM Schematic

1. Verify correct voltage and input polarity, and turn the external power supplies ON.

The EVM should begin operation.1. Adjust the input signal.2. Adjust the control inputs to the desired settings.3. Adjust the amplifier gain by installing/removing the gain jumpers, J1 and J2.

Figure 3. TPA3123D2 EVM Schematic

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4 TPA3123D2 EVM PCB Layers

TPA3123D2 EVM PCB Layers

The following illustrations depict the TPA3123D2 EVM PCB layers.

Figure 4. Top Side Layout

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TPA3123D2 EVM PCB Layers

Figure 5. Bottom Side Layout

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5 TPA3123D2 Evaluation Module Parts List

TPA3123D2 Evaluation Module Parts List

Table 3. TPA3123D2 EVM Bill of MaterialsRef. Description Size Qty Status Manufacturer Part Number

C1, C7, C14 Capacitor, ceramic, 0.1 μF, ±10%, X7R, 50V 0603 3 TDK C1608X7R1H104KT

C2, C8, C10,

Capacitor, Electrolytic, 470 μF, 35 V Radial 4 Nichicon UHE1V471MH06C17

C3–C6 Capacitor, ceramic, 1.0 μF, ±10%, X7R, 16V 0603 4 Taiyo Yuden EMK107BJ105KA-TR

C9, C16 Capacitor, ceramic, 1.0 μF, ±10%, X7R, 50V 0805 2 open TDK C3216X7R1H105K

Capacitor, ceramic, 0.22 μF, ±10%, X7R,C12, C15 0603 2 TDK C1608X7R1C224KT16V

Capacitor, ceramic, 10 μF, +80%/–20%,C13 1210 1 Murata GRM32DF51H106ZA01LY5V, 50V

C19, C20 Capacitor, metal poly, 0.68 μF, 63V Radial 2 EPCOS, Inc. B32529C684J

Inductor, 22 μH, radial lead, ferrite material,L1-L2 Radial 2 Toko A7503AY-220Mshielded

R1-R4 Resistor, chip, 10 k Ω, 1/16 W, 5% 0603 4 Panasonic ERA-V15J103V

R6, R7 Resistor, chip, 4.7 k Ω, 1/10 W, 5% 0603 2 Panasonic ERJ-3GEYJ472V

R9, R10 Resistor, chip, 0 Ω, 1/10 W, 5% 0603 2 Panasonic ERJ-3GEY0R00V

J1-J2 Phono Jack, PC mount, switched 2 Switchcraft PJRAN1X1U03

Banana Jack w/knurled Thumbnut (nickelJ3-J8 6 Johnson 111-2223-001plate)

J9-J10 Header, 2 position, Male 2mm 2 Norcomp 2163-36-01-P2

JP9-JP10

SHUNT, 2MM 2mm 2 Specialty 2JM-G(shunts)

SW1, SW2 Switch, momentary, SMD, Low profile 2 Panasonic EVQ-PPBA25

Standoffs, 5/8" length, 4-40 thread 4 Keystone 1808

Screws, 4-40, .375 4

U1 TPA3123D2PWP 24 pin TSSOP 1 TI TPA3123D2PWP

The following parts comprise the power-off depop circuit which is enabled by installing J11.

Capacitor, ceramic, 10 pF, ±10%, C0G,C11, C21 0603 2 open Murata GRM1885C2A100RA01D100V

Capacitor, ceramic, 0.01 μF, ±10%, X7R,C18 0603 1 TDK C1608X7R1H103K50V

D1 Shunt Regulator, Adjustable SOT-23-3 1 Texas Instruments TLV431ACDBZR

D2 Rectifier, Silicon, 0.15 A, 75V mini MELF 1 Micro Commercial DL4148-TP

Q4 Transistor, NPN, AMP SOT-23 1 Fairchild Semiconductor MMBT3904

R8 Resistor, chip, 4.7 k Ω, 1/10 W, 5% 0603 1 Panasonic ERJ-3GEYJ472V

R11 Resistor, chip, 2.49 k Ω, 1/10 W, 1% 0603 1 Vishay CRCW06032K49FKEA

R12, R18, R19 Resistor, chip, 10 k Ω, 1/16 W, 5% 0603 3 Panasonic ERA-V15J103V

R13 Resistor, chip, 150 k Ω, 1/10 W, 1% 0603 1 Vishay CRCW0603150KJNEA

R15 Resistor, chip, 1 M Ω, 1/10 W, 1% 0603 1 open Vishay CRCW06031M00FKEA

R16 Resistor, chip, 20 k Ω, 1/10 W, 1% 0603 1 Vishay CRCW060320K0FKEA

R17 Resistor, chip, 10 Ω, 1/16 W, 1% 0603 1 open Vishay CRCW060310R0FKEA

J11 Header, 2 position, Male 2mm 1 open Norcomp 2163-36-01-P2

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EVALUATION BOARD/KIT IMPORTANT NOTICE

Texas Instruments (TI) provides the enclosed product(s) under the following conditions:This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSESONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must haveelectronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be completein terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmentalmeasures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit doesnot fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling(WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days fromthe date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYERAND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OFMERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claimsarising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and allappropriate precautions with regard to electrostatic discharge.EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANYINDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.

TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents orservices described herein.

Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. Thisnotice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/orsafety programs, please contact the TI application engineer or visit www.ti.com/esh .No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, orcombination in which such TI products or services might be or are used.FCC Warning

This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSESONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radiofrequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which aredesigned to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments maycause interference with radio communications, in which case the user at his own expense will be required to take whatever measures maybe required to correct this interference.

EVM WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the input voltage range of 10 V to 30 V and the output voltage range of 0 V to 30 V.Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questionsconcerning the input range, please contact a TI field representative prior to connecting the input power.Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM.Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification,please contact a TI field representative.During normal operation, some circuit components may have case temperatures greater than 85 °C. The EVM is designed to operateproperly with certain components above 85 °C as long as the input and output ranges are maintained. These components include but arenot limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identifiedusing the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation,please be aware that these devices may be very warm to the touch.

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements,improvements, and other changes to its products and services at any time and to discontinue any product or service without notice.Customers should obtain the latest relevant information before placing orders and should verify that such information is current andcomplete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’sstandard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support thiswarranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarilyperformed.

TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products andapplications using TI components. To minimize the risks associated with customer products and applications, customers shouldprovide adequate design and operating safeguards.TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, maskwork right, or other TI intellectual property right relating to any combination, machine, or process in which TI products or servicesare used. Information published by TI regarding third-party products or services does not constitute a license from TI to use suchproducts or services or a warranty or endorsement thereof. Use of such information may require a license from a third party underthe patents or other intellectual property of the third party, or a license from TI under the patents or other intellectual property of TI.Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and isaccompanied by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is anunfair and deceptive business practice. TI is not responsible or liable for such altered documentation. Information of third partiesmay be subject to additional restrictions.Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or servicevoids all express and any implied warranties for the associated TI product or service and is an unfair and deceptive businesspractice. TI is not responsible or liable for any such statements.TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product wouldreasonably be expected to cause severe personal injury or death, unless officers of the parties have executed an agreementspecifically governing such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramificationsof their applications, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-relatedrequirements concerning their products and any use of TI products in such safety-critical applications, notwithstanding anyapplications-related information or support that may be provided by TI. Further, Buyers must fully indemnify TI and itsrepresentatives against any damages arising out of the use of TI products in such safety-critical applications.TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products arespecifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet militaryspecifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade issolely at the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements inconnection with such use.TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI productsare designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use anynon-designated products in automotive applications, TI will not be responsible for any failure to meet such requirements.Following are URLs where you can obtain information on other Texas Instruments products and application solutions:

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Amplifiers amplifier.ti.com Audio www.ti.com/audioData Converters dataconverter.ti.com Automotive www.ti.com/automotiveDSP dsp.ti.com Broadband www.ti.com/broadbandInterface interface.ti.com Digital Control www.ti.com/digitalcontrolLogic logic.ti.com Military www.ti.com/militaryPower Mgmt power.ti.com Optical Networking www.ti.com/opticalnetworkMicrocontrollers microcontroller.ti.com Security www.ti.com/securityRFID www.ti-rfid.com Telephony www.ti.com/telephonyLow Power www.ti.com/lpw Video & Imaging www.ti.com/videoWireless

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