Texas Instruments TPA3121D2 User manual

1 Introduction

1.1 Description

User's GuideSLOU221 – June 2008

TPA3121D2 Audio Power Amplifier Evaluation Module

Contents1 Introduction ................................................................................................................... 11.1 Description ........................................................................................................... 11.2 TPA3121D2 EVM Specifications ................................................................................. 32 Operation ..................................................................................................................... 32.1 Quick Start List for Stand-Alone Operation ...................................................................... 33 Reference ..................................................................................................................... 43.1 TPA3121D2 EVM Schematic...................................................................................... 43.2 TPA3121D2 EVM PCB Layers .................................................................................... 53.3 TPA3121D2EVM Bill of Materials................................................................................. 7

List of Figures

1 The TI TPA3121D2 Audio Power Amplifier EVM – Top View ......................................................... 22 The TI TPA3121D2 Audio Power Amplifier EVM – Bottom View ..................................................... 23 TPA3121D2 EVM Schematic............................................................................................... 44 TPA3121D2 EVM – Top Side Layout ..................................................................................... 55 TPA3121D2 EVM – Bottom Side Layout ................................................................................. 6

List of Tables

1 Gain Settings ................................................................................................................. 3

The TPA3121D2 evaluation module consists of a single 20W, class-D, stereo audio power amplifiercomplete with a small number of external components mounted on a circuit board that can be used todirectly drive speakers with an external analog audio source as the input.

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Introduction

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Figure 1. The TI TPA3121D2 Audio Power Amplifier EVM – Top View

Figure 2. The TI TPA3121D2 Audio Power Amplifier EVM – Bottom View

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1.2 TPA3121D2 EVM Specifications

2 Operation

2.1 Quick Start List for Stand-Alone Operation

2.1.1 Power Supply

2.1.2 Evaluation Module Preparations

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Operation

Supply voltage range 10V to 26VI

Supply current 3A maxP

Continuous output power per channel: 8 Ω, VCC = 24 V, THD+N = 10% 10 WR

Minimum load impedance 6 Ω

Follow these steps to use the TPA3121D2EVM 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 10V–26V to the module VCC (J7) and GND(J8) banana jacks taking care to observe marked polarity.

Inputs and Outputs1. Connect a speaker across GND ( J5) and +ROUT ( J6). Connect another speaker across LOUT ( J3)and GND ( J4)2. Install both gain jumpers GAIN0 ( J1) and GAIN1 ( J2). This will set the gain of the amplifier to thelowest level, 20dB.

Control Inputs1. SHUTDOWN: This terminal is active LOW. A LOW on the device terminal ( < 0.8V) shuts down theamplifier; a HIGH (>2V) on the device terminal places the amplifier in the active state. Holding downswitch SW1 will place the amplifier in the SHUTDOWN state. Releasing SW1 will return the amplifier tothe active state. This terminal is Vcc compliant.2. MUTE: This terminal is active HIGH. A HIGH (>2V) on this terminal will immediately terminate audioplayback through the speakers; a LOW ( < 0.8V) will enable the device. The outputs will remainswitching with fifty percent duty cycle. SW2 on the EVM controls the state of the MUTE terminal.Holding down switch SW2 will place the amplifier in the MUTE state. Releasing SW2 will return theamplifier to the active state. This terminal is Vcc compliant.3. GAIN0/GAIN1: Together, these terminals determine the gain of the amplifier. Refer to Table 1 below.Installing a jumper in J1 or J2 will set the respective terminal to GND. Removing the jumper will set therespective terminals to VCC. Removing jumpers will INCREASE the gain while installing jumpers willDECREASE the gain. Logic levels are TTL compatible. These terminals are Vcc compliant

Table 1. Gain Settings

(1)

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

ON ON 20ON OFF 26OFF ON 32OFF OFF 36(1)

OFF = Jumper REMOVED; ON = Jumper INSTALLED

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2.1.3 Power Up

3 Reference

3.1 TPA3121D2 EVM Schematic

RIGHT_OUT

LEFT_IN

RIGHT_IN

LEFT_OUT

VCC

C9 DNI

C16 DNI

10K

GND

TP4TP4

SW1

SHUTDOWN

SW1

SHUTDOWN

TPA3121D2

PVCCL1

SDZ

PVCCL2

MUTE

LIN

RIN

BYP

GND1

GND2

PVCCR1

VCLAMP

PVCCR2

12 PVSSR2 13

PVSSR1 14

OUTR 15

BSR 16

GAIN1 17

GAIN0 18

AVCC2 19

AVCC1 20

BSL 21

OUTL 22

PVSSL2 23

PVSSL1 24

THERMAL

C14

0.1uF C14

0.1uF

TP5TP5

4.7K

33uH

VCC

1.0uF C6

1.0uF

10K

TP12

RGND

TP12

RGND

SW2

MUTE

SW2

MUTE

TP3TP3

C12 0.22uFC12 0.22uF C9

0.22uF

4.7K

470uF

GND

TP2TP2

J10

RIN

J10

RIN

LIN

C10

470uF

C10

470uF

1 2

TP10

GND

TP10

GND

C16

0.22uF

C16

0.22uF

10K

C15 0.22uFC15 0.22uF

TP7

RIGHT_OUT

TP7

RIGHT_OUT

GND

GAIN0

C17

470uF

C17

470uF

1 2

1.0uF

+LOUT

TP11

LGND

TP11

LGND

TP1

LEFT_IN

TP1

LEFT_IN

C19

0.22uF

C19

0.22uF

10K

470uF

+ROUT

R10

C13

10uF C13

10uF

1.0uF

GAIN1

C7 0.1uFC7 0.1uF

C20

0.22uF

C20

0.22uF

TP6

LEFT_OUT

TP6

LEFT_OUT

C1 0.1uFC1 0.1uF

TP9

INPUT_GND

TP9

INPUT_GND

TP8

RIGHT_IN

TP8

RIGHT_IN

33uH

1.0uF C5

1.0uF

Reference

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1. Verify correct voltage and input polarity and turn the external power supplies ON.The EVM should begin operation2. Adjust the input signal.3. Adjust the control inputs to the desired settings.4. Adjust the amplifier gain by installing/removing the gain jumpers, J1 and J2.

Figure 3. TPA3121D2 EVM Schematic

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3.2 TPA3121D2 EVM PCB Layers

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Reference

Figure 4. TPA3121D2 EVM – Top Side Layout

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Reference

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Figure 5. TPA3121D2 EVM – Bottom Side Layout

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3.3 TPA3121D2EVM Bill of Materials

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Reference

Reference Description Load Status Size Qty MFR Part Number

ALL COMPONENTS SHOULD BE ORDERED AS LEAD-FREE

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

C2, C8, C10, Capacitor, electrolytic, 470 µF, 35V, 105C, Low impedance Radial 4 Nichicon UHE1V471MH06C17

C3, C4, C5, C6, Capacitor, ceramic, 1.0 µF, ±10%, X7R, 16V 0603 4 Taiyo Yuden EMK107BJ105KA-TR

C9, C16 Capacitor, ceramic, 0.22 µF, ±10%, X7R, 50V do not install 1206 2 Kemet C1206C684K5RACTU

C11 Capacitor, electrolytic, 220 µF, 35V, 85 °C, General Purpose Radial 1 Panasonic ECA-1VM221B

C12, C15 Capacitor, ceramic, 0.22 µF, ±10%, X7R, 16V 0603 2 TDK C1608X7R1C224KT

C13 Capacitor, ceramic, 10 µF, +80%/–20%, Y5V, 50V 1210 1 Murata GRM32DF51H106ZA01L

C19, C20 Capacitor, metal poly, 0.22 µF, 63V Radial 2 Epcos, Inc. B32559C224K000

L1–L2 Inductor, 33 µH, radial lead, ferrite material, shielded Radial 2 Toko A7503AY-330M

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% 603 2 Panasonic ERJ-3GEYJ472V

R9, R10 Resistor, chip, 0 Ω, 1/10 W, 5% 603 2 Panasonic ERJ-3GEY0R00V

R11 Resistor, chip, 220 Ω, 1/4 W, 1% 1206 1 Panasonic ERJ-SENF2200V

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

J3–J8 Banana Jack w/knurled Thumbnut (nickel plate) 6 Johnson 111-2223-001

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, 0.375 4

U1 TPA3121D2PWP 24 pin 1 TI TPA3121D2PWPTSSOP

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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 26 V and input current of 3 A maximum.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 60 °C . The EVM is designed to operateproperly with certain components above 60 °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 shouldobtain the latest relevant information before placing orders and should verify that such information is current and complete. All products aresold 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’s standardwarranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except wheremandated by government requirements, testing of all parameters of each product is not necessarily performed.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 should provideadequate 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, mask work right,or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Informationpublished by TI regarding third-party products or services does not constitute a license from TI to use such products or services or awarranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectualproperty 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 is accompaniedby all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptivebusiness practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additionalrestrictions.

Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids allexpress and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is notresponsible 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 would reasonablybe expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governingsuch use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, andacknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their productsand any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may beprovided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products insuch 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 is solely atthe Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products aredesignated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designatedproducts 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:Products ApplicationsAmplifiers amplifier.ti.com Audio www.ti.com/audioData Converters dataconverter.ti.com Automotive www.ti.com/automotiveDSP dsp.ti.com Broadband www.ti.com/broadbandClocks and Timers www.ti.com/clocks Digital Control www.ti.com/digitalcontrolInterface interface.ti.com Medical www.ti.com/medicalLogic 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/telephonyRF/IF and ZigBee® Solutions www.ti.com/lprf Video & Imaging www.ti.com/videoWireless www.ti.com/wireless

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