Texas Instruments Audio Power Aplifier Evaluation Module TPA 311 User's Manual
Contents
1. S o o iu o 2 Qa S 83 E Q SUB S m o y DC re Power In Out U UO Io D E 8g O Of Signal Conditioning O O Q jo 6 5 JO e O Q 8 BO Speaker oolo o O Output s gt O 2 O O g amp o 9 Q 3 Q O a O Q O CAUTION Q Do not insert or remove O EVM boards with power applied o O Headphone Output Plug N Play Audio Amplifier Evaluation Platform SLOP097 Rev C 1 3 2 Details The TPA311 Audio Power Amplifier Evaluation Module 3 2 The TPA311 Audio Power Amplifier Evaluation Module The TPA311 Audio Power Amplifier Evaluation Module is powered by a TPA311 350 mW Low Power Audio Amplifier IC and includes on board gain adjustment a shutdown control signal input with on board switch and can be operated in either the BTL or single ended output mode The module can be used with the TI Plug N Play Audio Amplifier Evaluation Platform Figure 3 1 or wired directly into circuits or equipment The module has single in line header connector pins mounted to the under side of the board These pins allow the module to be plugged into the TI platform which automatically makes all the signal input and output power and control connections to the module The module connection pins are on 0 1 inch centers to allow easy use with standard perf board and plug2. Evaluation modules are easily removed from the platform by simply prying them up and lifting them out of their sockets Care must be taken however to prevent bending the pins 3 3 1 1 EVM Insertion 1 Remove all power from the evaluation platform 2 Locate socket U3 or U4 on the platform 3 Orient the module correctly 4 Carefully align the pins of the module with the socket pin receptacles 5 Gently press the module into place 6 Check to be sure that all pins are seated properly and that none are bent over 3 3 1 2 EVM Removal 3 6 1 Remove all power from the evaluation platform 2 Using an appropriate tool as a lever gently pry up one side of the module a small amount 3 Change to the opposite side of the module and use the tool to pry that side up a small amount 4 Alternate between sides prying the module up a little more each time to avoid bending the pins until it comes loose from the socket 5 Lift the EVM off of the platform Details Using The TPA311 EVM With the Plug N Play Evaluation Platform 3 3 2 Signal Routing Signal flow on the platform is controlled by two signal routing switches as shown in Figure 3 5 Figure 3 5 Platform Signal Routing and Outputs Conditioning Off oa aed e U3 i e gt c TOV E TPA311 R R Amplifier EVM gt J7 J8 J9 1 2 EON Speaker meet U4 gt Outputs D 4 9 34 TPA311 iL L T Am
3. Right External Mute Control gt gt e C5 active high 009227 OUT LI GND BH Literature SLOP116 Audio Input gt Left Details 3 13 TPA311 Audio Power Amplifier Evaluation Module Parts List 3 5 TPA311 Audio Power Amplifier Evaluation Module Parts List Table 3 1 TPA311 EVM Parts List EVM Manufacturer Rc wo oem Seem omemm eere R4 C5 C1 C2 C3 C4 R1 R2 R3 S1 U1 PCB1 Trim Pot 200 kQ Cermet ST SL through hole Capacitor 10 uF 6 3 V Capacitor 1 uF 80 20 nonpolarized Capacitor 2 2 uF 20 nonpolarized Capacitor 5 pF Resistor 20 KQ 1 8 W 5 Switch momentary IC TPA311 audio amplifier 350 mW mono PCB TPA311 sample EVM A 1206 1206 0805 1206 SOIC 8 NOTE All items are SMD except as noted 3 14 1 Bourns 3323P 1 204 Panasonic ECS TOJY106R Murata GRM42 6Y5V105Z16BL TDK C3216X5R1A225 Panasonic ECU V1HO50CCN Panasonic ERJ 8GEYJ203 Panasonic P8048SCT ND Tl TPA311 Digi Key 3323P 204 ND Digi Key PCS1106CT ND Newark 93F2254 Digi Key PCCO50CNCT ND Digi Key P20KECT ND Digi Key P8048SCT ND Details
4. SVX4L 2 2 Quick Start Quick Start List for Platform 2 2 Quick Start List for Platform Use the following steps when using the TPA311 EVM with the TI Plug N Play Audio Amplifier Evaluation Platform see the platform user s guide SLOU011 for additional details Numbered callouts for selected steps are shown in Figure 2 1 and details appear in Chapter 3 Platform preparations 1 Ensurethatall external power sources are setto OFFand thatthe platform power switch S1 is set to OFF 2 Install a TPA311 module in platform sockets U3 and U4 for stereo operation or a module in either U3 or U4 for single channel operation taking care to align the module pins correctly 3 Use switch S2 to select or bypass the signal conditioning EVM U1 4 Setcontrol signal Polarity jumper JP8 to Hi 5 Set jumper JP6 to select the Mode control input causes the TPA311 to Switch to the single ended output mode if a plug is inserted into platform headphone jack J10 6 Ifthe headphone Jack J10 output will be used set Hp source switch S3 to U2 UA Table 2 2 Platform Jumper and Switch Settings for the TPA311 Notes 1 X Don t care 2 Set S2to ON when signal conditioning board is installed in U1 set S2 to OFF when no signal conditioning board is installed Power supply 7 Select and connect the power supply a Connectan external regulated power supply set to a voltage between 2 0 V and 5 5 V t
5. The IC includes two separate internal amplifiers and can operate in either the bridged tied load BTL mode or the single ended mode as selected by the SE BTL pin In the BTL mode the two amplifiers operate 180 out of phase with each other for increased power The speaker load is connected directly across Vo and Vo and neither line is connected to ground BTL operation provides many benefits including quadruple the output power of single ended operation and no need for bulky output coupling capacitors In the single ended mode one internal amplifier is turned off and the speaker load is connected between the Vo terminal through an output coupling capacitor and system ground For more information see the TPA311 amplifier IC data sheet TI Literature Number SLOS207 3 2 2 BTL Operation 3 4 To operate in the bridge tied load output mode the module SE BTL control input terminal must be held low The module output signal from OUT must go through the speaker load and be returned directly to OUT and NOTto system ground This requires that the OUT line be isolated not only from system ground but also from the OUT lines of any other amplifiers in the system The platform provides such isolated output lines from the amplifier EVM sockets directly to separate left and right speaker connectors Details The TPA311 Audio Power Amplifier Evaluation Module 3 2 8 SIngle Ended Operation 3 2 4 Module Gain 3 2 5 Shutdown For single e
6. board based prototyping systems or to be wired directly into existing circuits and equipment when used stand alone The module appears in Figure 3 2 and its schematic is shown in Figure 3 3 Figure 3 2 TPA311 EVM Shutdown a GND 3 C3 009227 m out LI GNDO EST OUT O C4 ie Ui oO seen Uno ds B D GND rpA3 11 Literature Figure 3 3 TPA311 EVM Schematic Diagram VDD 2Vto5 5V GND C5 P 10 uF No e 4 Shutdown R1 20 ka ce _L L 22yuF L ES OUT BTL r GND SE BTL 22uF R5 zz C1 100kQ OUT tur x L c4 Audio Input e R3 R4 5pF R2 20kQ 200k2 GND 20 kQ Details 3 3 The TPA311 Audio Power Amplifier Evaluation Module 3 2 1 TPA311 Audio Amplifier IC The TPA311 audio amplifier IC is a CMOS device intended primarily for bridge tied load BTL operation in battery powered applications It is supplied in a very small surface mount package and has been designed to operate from low supply voltages between approximately 2 V and 5 5 V and deliver up to approximately 350 mW into an 8 O BTL Figure 3 4 Typical applications include portable phones toys games and similar hand held audio applications Figure 3 4 TPA311 Amplifier IC 6 VDD 4 gt IN 5 gt Vo 2 Bypass 8 gt Vo 1 Shutdown 7 3 GND SE BTL
7. A311 evaluation module Topic Page 3 1 Precautions 3 2 3 2 The TPA311 Audio Power Amplifier Evaluation Module 3 3 3 2 1 TPA311 Audio Amplifier IC 3 4 3 2 2 BTL Operation 3 4 3 2 3 Single Ended Operation 3 5 3 2 4 Module Gain 3 5 3 2 5 Shutdown 3 5 3 3 Using The TPA311 EVM With The Plug N Play Evaluation Platform 3 6 3 3 1 Installing and Removing EVM Boards 3 6 3 3 2 Signal Routing e 3 3 3 Mute Mode 3 8 3 3 4 Power Requirements 3 10 3 3 5 Inputs and Outputs 3 11 3 4 Using The TPA311 EVM Stand Alone 3 12 3 4 1 TPA311 EVM Connected for BTL Output 3 12 3 4 2 TPA311 EVM Connected for Single Ended Output 3 13 3 5 TPA311 Audio Power Amplifier Evaluation Module Parts List 3 14 3 1 Precautions 3 1 Precautions Power Supply Input Polarity and Maximum Voltage Always ensure that the polarity and voltage of the external power connected to Vcc power input connector J1 J2 and or Vpp power input connector J6 are correct Overvoltage or reverse polarity power applied to these terminals can open on board soldered in fuses and cause other damage to the platform installed evaluation modules and or the power source Inserting or Removing EVM Boards Do not insert or remove EVM boards with power applied damage to the EVM board the platform or both may result Figure 3 1 The TI Plug N Play Audio Amplifier Evaluation Platform
8. EERE ee ee en ee 1 1 1 1 Feature Highlights 0 0 cece tenet rn 1 3 1 2 Description eise haa ed Se oe ete eines een pecs eee es 1 4 1 3 TPA311 EVM Specifications 0 ete 1 4 QUICK Start esse ENS 2 1 2 1 PiecautlOls serrara tanna ogee doe tnrlagnie oye deu ies SE a a dda ed 2 2 2 2 Quick Start List for Platform 0 ccc eee eens 2 3 2 3 Quick Start List for Stand Alone 00 0 eee 2 4 Details ee 3 1 9 1 PrecautloriS iiu sees isani isini Laon duces Farad wh edd ea as Rd d on eee ae 3 2 3 2 The TPA311 Audio Amplifier Evaluation Module cee ee eee eee 3 3 3 231 TPA311 Audio Amplifier IC 0 0 ccc eee 3 4 3 22 IBML Operation cem Rx seine RE TR ERLIERE RI RRRRERG os 3 4 3 23 Single Ended Operation 0 00 ccc berin k arin eens 3 5 3 2 4 Module Gain eee sex PERRO ANTE CRGA ERU E RR A e ees 3 5 3 2 5 ShutdoWh i22 Es Ix RRADERRCCPRRRETEATRPRLIR Rer qe Gas Beye ds RIA 3 5 3 3 Using The TPA311 EVM With The Plug N Play Evaluation Platform 3 6 3 3 1 Installing and Removing EVM Boards seseseeese esses 3 6 3 3 2 Signal Routing ssssssssssssssssse s nn 3 7 3 9 9 Mute Mode c lae eer npe Re eee tr dica fu atr 3 8 3 3 4 Power Requirements 2 000 cece eee 3 10 3 3 5 Inputs and Outputs iios ear eee esses beca ge cae lee 3 11 3 4 Using The TPA311 EVM Stand ALone ccc cece eee eee 3 12 3 4 44 TPA311 EVM C
9. PA311 amplifier between BTL and single ended using the control signal from the platform headphone jack jumper JP6 to MODE 3 3 3 3 Mute Mode Polarity Select JP8 A second 3 pin jumper header JP8 on the platform selects the control signal polarity by connecting either the active high or the active low line from the headphone jack to jumper JP6 When JP6 is set to Mute use the following JP8 settings for the TPA311 To mute the TPA311 amplifier module when a plug is inserted into the headphone jack jumper JP8 to Hi this is the typical setting To mute the TPA311 amplifier module until a plug is inserted into the headphone jack jumper JP8 to Lo When JP6 is set to Mode use the following JP8 settings for the TPA311 To switch the TPA311 amplifier module to the single ended output mode when a plug is inserted into the headphone jack jumper JP8 to Hi this is the typical setting To switch the TPA311 amplifier module to the BTL output mode when a plug is inserted into the headphone jack jumper JP8 to Lo Details 3 9 Power Requirements 3 3 4 Power Requirements 3 10 The TPA311 Audio Power Amplifier Evaluation Module can operate from any voltage between approximately 2 V and 5 5 V however the TPA311 amplifier IC on the module is characterized for operation at 3 3 V and 5 V For best performance highest output power with lowest distortion the module should be operated at approximately 5 V unless there is a specif
10. Platform is equipped with several standard conectors for audio inputs and outputs In most cases audio signals enter the platform through either a pair of RCA phono jacks J3 and J5 or a miniature 1 8 stereo phone jack J4 Certain signal conditioning and amplifier EVMs however may have additional signal input connectors mounted on the module circuit board The platform audio signal input jacks J3 J4 and J5 are of the closed circuit type grounding the signal input lines when no plugs are inserted Amplified audio output signals leave the platform through left and right RCA phono jacks J7 and J9 left and right pairs of compression connectors for stripped speaker wires J8 and optionally through a miniature 1 8 stereo phone jack J10 for headphones The audio output lines from the power amplifiers are separate all the way to the edge of the platform output jacks J7 J8 and J9 the OUT lines from the power amplifier sockets are not tied to each other or to platform ground This allows the TPA311 power amplifier EVMs to operate in the highly efficient bridge tied load configuration The headphone jack J10 is capacitively coupled to source select switch S3 which connects J10 to the output lines of either the headphone amplifier socket or the power amplifier sockets Figure 3 5 When the TPA311 output signal is routed to J10 by S3 signals output via J10 are returned to platform ground when a plug is inserted Fi
11. We Texas e TPA311 Audio Power Amplifier Evaluation Module User s Guide 1998 Mixed Signal Products TPA311 Audio Power Amplifier Evaluation Module User s Guide SLOUO13 February 1998 3 Texas ds INSTRUMENTS Bude dus IMPORTANT NOTICE Texas Instruments TI reserves the right to make changes to its products or to discontinue any semiconductor product or service without notice and advises its customers to obtain the latest version of relevant information to verify before placing orders that the information being relied on is current Tl warrants performance of its semiconductor products and related software to the specifications applicable at the time of sale in accordance with Tl s standard warranty Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty Specific testing of all parameters of each device is not necessarily performed except those mandated by government requirements Certain applications using semiconductor products may involve potential risks of death personal injury or severe property or environmental damage Critical Applications TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED INTENDED AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFE SUPPORT APPLICATIONS DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS Inclusion of TI products in such applications is understood to be fully at the risk of the customer Use of TI products in
12. audio input and output jacks 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 TPA311 EVM Specifications Supply voltage range Vpp eee eee eee aiaivi adati III 2Vto5 5V Supply current lpp eears tenia meian eee E E nns 250 mA max Continuous output power Po 8 Q BTL Vpp 5 Vi eee eee 350 mW 32 0 BIL Vppa5 Vi isse exer ERE 75 mW Audio Input voltage Vj eene ue repe sane eed Aden 2 Vpp max Minimum load impedance RL ee teeta n 80 Introduction Chapter 2 Quick Start The steps in this chapter can be followed to quickly prepare the TPA311 audio amplifier EVM for use While using the TPA311 with the TI Plug N Play Audio Amplifier Evaluation Platform is a quick and easy way to connect power signal and control inputs and signal outputs to the EVM using standard connectors the audio amplifier evaluation module can be used stand alone by making connections directly to the module pins and can be wired directly into existing circuits or equipment The platform switch and jumper settings shown in Table 2 1 are typical for the TPA311 EVM and will cause the TPA311 to switch to single ended output mode when a plug is inserted into platform headphone jack J10 Table 2 1 Typical TI Plug N Play Platform Jumper and S
13. d 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 Introduction 1 3 Description 1 2 Description The TPA311 Audio Power Amplifier Evaluation Module is a complete low power single channel audio power amplifier It consists of the TI TPA311 350 mW Low Voltage Audio Power Amplifier IC along with a small number of other parts mounted on a circuit board that is approximately one and a quarter inches square Figure 1 1 Figure 1 1 The TI TPA311 Audio Amplifier Evaluation Module Shutdown diu GND 3 o C5 S1 m C3 009227 R1 E L c2 mm R5 ESI C4 O SE BTL Single in line header pins are mounted to the underside of the module circuit board to 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 has room for a pair of TPA311 evaluation modules and is a convenient vehicle for demonstrating Tl s audio power amplifier and related evaluation modules The EVMs simply plug into the platform which auto matically provides power to the modules interconnects them correctly and connects them to a versatile array of standard
14. de When this input is tied to Vpp the module operates in the single ended output mode In the typical application output mode switching allows the TPA311 to operate in the BTL output mode for increased power to internal speakers and then Switch to single ended mode to drive headphones when a plug is inserted into the headphone jack 3 3 3 1 Headphone Jack Control Signals The platform headphone output jack J10 contains an internal switch that changes the state of a pair of control lines when a plug is inserted Figure 3 6 Each control line is pulled down by a 1 kQ resistor to ground R4 and R5 The switch in the headphone jack pulls one line or the other up to Vpp through a 240 Q resistor R3 depending on whether a plug is inserted in J10 or not Figure 3 6 Mute Mode and Polarity Control 3 8 VDD Polarity JP8 JP6 uu J10 Lo Mode uua Headphone Power 1 1 arp me Hi Mute ae R4 R5 SPK 1ko 1ko U2 U4 Details Using The TPA311 EVM With the Plug N Play Evaluation Platform 3 3 3 2 Mute Mode Select JP6 A 3 pin jumper header JP6 on the platform functioning as a SPDT switch routes the control signal from the headphone jack to either the mute control input pin or the mode control input pin of the evaluation module To mute the TPA311 amplifier module using the control signal from the platform headphone jack jumper JP6 to MUTE To switch the output mode of the T
15. e output lines of either the headphone amplifier socket U5 or the power amplifier sockets U2 U4 B To keep the TPA311 amplifier outputs separated set switch S3 to the headphone amplifier position U5 and use the speaker outputs J7 J8 and J9 BI To route the TPA311 amplifier outputs to the headphone output jack J10 set switch S3 to the power amplifier position U2 U4 use this setting only if the TPA311 EVMs are to drive single ended loads connected to J10 Details 3 7 Using The TPA311 EVM With the Plug N Play Evaluation Platform 3 3 3 Mute Mode The TPA311 EVM is equipped with a mute shutdown control input pin When this input is tied to Vpp the TPA311 amplifier IC on the module shuts down and assumes an ultra low power mode When the EVM control input is tied to GND or allowed to float amplifier operation resumes In typical applications as often found in notebook computers portable audio products and such the internal speakers mute when headphones are plugged into the headphone jack or internal speakers mute when external speakers are connected In applications using separate speaker and headphone amplifiers the one not being used can be shut down muted to conserve power A mode control input pin on the EVM switches the TPA311 amplifier IC between the bridge tied load BTL output mode and the single ended output mode When the mode control input is tied to GND the module operates in the BTL output mo
16. e without clipping or overloading the TPA311 input and the TPA311 gain kept as low as possible When the shutdown terminal of the TPA311 amplifier IC is taken high the IC ceases operation and enters an ultra low power state This is accomplished by applying a control signal to the module Shutdown pin or by pressing the Shutdown switch S1 on the module When the control signal goes low or is removed or the switch is released amplifier operation resumes The Plug N Play platform can generate the shutdown mute signal for the module either when a plug is inserted into the platform headphone output jack or when the plug is removed as selected by a platform jumper JP8 Details 3 5 Using The TPA311 EVM With the Plug N Play Evaluation Platform 3 3 Using The TPA311 EVM With the Plug N Play Evaluation Platform 3 3 1 The TPA311 Audio Amplifier Evaluation Module was designed to be used with the TI Plug N Play Audio Amplifier Evaluation Platform It simply plugs into socket U3 or U4 The following paragraphs provide additional details for using the TPA311 EVM with the platform Installing and Removing EVM Boards TI Plug N Play evaluation modules use single in line header pins installed on the underside of the module circuit board to plug into sockets on the platform The EVM pins and the platform sockets are keyed such that only the correct type of EVM can be installed in a particular socket and then only with the proper orientation
17. for compliance with the limits of computing devices pursuant to subpart J of part 15 of FCC rules which are designed to provide reasonable protection 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 Trademarks Tl is a trademark of Texas Instruments Incorporated If You Need Assistance If You Need Assistance If you want to Request more information about Texas Instruments Digital Signal Processing DSP products Order Texas Instruments docu mentation Ask questions about product op eration or report suspected prob lems Report mistakes in this document or any other TI documentation Do this Call the PICT hotline 972 644 5580 Or send a fax to the PIC 972 480 7800 Or write to Texas Instruments Incorporated Product Information Center MS 3123 P O Box 660246 Dallas Texas 75266 Call the PICT hotline 972 644 5580 Call the PICT hotline 972 644 5580 Send a fax to MSP Marketing Documentation Correction 972 480 3160 Or send your comments to Texas Instruments Incorporated MSP Marketing Documentation MS 8710 P O Box 660199 Dallas Texas 75266 0199 t Texas Instruments Product Information Center Contents Hogar cose eee eee tritt ee er ee ee ee
18. gure 3 7 requiring single ended operation of the power amplifiers Figure 3 7 Typical Headphone Plug Left Right GND Details 3 11 Using The TPA311 EVM Stand Alone 3 4 Using The TPA311 EVM Stand Alone Using the TPA311 Audio Power Amplifier Evaluation Module stand alone is much the same as using it with the platform The same 2 V to 5 5 V power sup ply range and the isolated OUT and OUT lines for BTL operation require ment exists Note that the mute signal applied to the EVM shutdown pins must be able to supply enough current to overcome the pulldown resistors on the modules 20 kQ 20 kQ for two EVMs 3 4 41 TPA311 EVM Connected for BTL Output Figure 3 8 TPA311 EVM Connected for Stereo BTL Output 5 VDC Shutdown a S1 Ri NND L c2 Ly Right R5 ESI C4 U1 I R3 Literature O SE BTL SLOP116 Audio R2 E Input E IN C1 R4 Right E GND rp4311 External Mute Control active high Left O SEBTL Audio R2 EST Input Left Note TheSE BTL SE BTL EVM pin is pulled to GND through a 100 KQ resistor on the mod ule 3 12 Details Using The TPA311 EVM Stand Alone 3 4 2 TPA311 EVM Connected for Single Ended Output Figure 3 9 TPA311 EVM Connected for Stereo Single Ended Output 5 VDC Shutdown VOD GND 3 C5 Em C3 009227 OUT DL GND B Literature SLOP116 Audio Input
19. ic reason for operating it from a lower voltage The TI Plug N Play Audio Amplifier Evaluation Platform with a voltage regulator EVM installed on it can provide a regulated Vpp supply from a wide variety of unregulated Vcc voltage inputs between approximately 5 5 V and 12 V including an on board 9 V battery Or an external regulated power source can be used to supply Vpp voltage to the platform and the TPA311 evaluation modules installed on it The platform is equipped with overvoltage and reverse polarity supply voltage input protection in the form of fused crowbar circuits I Vpp voltage applied to platform screw terminals J MUST NOT exceed the absolute maximum rating for the TPA311 amplifier IC installed on the evaluation module 6 V or damage to the IC may result In no case should Vpp voltage of the incorrect polarity or in excess of 6 1 V be applied to screw terminals J6 of the platform or the power protection circuit on the Vpp line will trip Vcc voltage applied to the platform MUST NOT exceed the maximum voltage input specified for the voltage regulator module installed in socket U6 12 V for the SLVP097 or damage to the voltage regulator module may result In no case should Vcc voltage applied to the platform exceed 15 V or the overvoltage protection circuit on the Vcc bus will trip Details Inputs and Outputs 3 3 5 Inputs and Outputs 3 3 5 1 Inputs 3 3 5 2 Outputs The TI Plug N Play Audio Amplifier Evaluation
20. luation Module SLOP116 It includes a list of EVM 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 3 1 2 Description 1 4 1 3 TPA311 EVM Specifications 1 4 Introduction 1 1 Feature Highlights Feature Highlights The TI TPA311 Audio Amplifier Evaluation Module and the TI Plug N Play Audio Amplifier Evaluation Platform include the following features J TPA311 Low Voltage Audio Power Amplifier Evaluation Module Single channel bridge tied load BTL or single ended operation 3 3 V and 5 V operation 350 mW output power into 8 O at 5 V BTL Ultra low current consumption in shutdown mute mode Internal thermal and short circuit protection Module gain adjustable between approximately 2 and 22 Quick and Easy Configuration with The TI Plug N Play Audio Amplifier Evaluation Platform Evaluation module is designed to simply plug into the platform auto matically 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 Platform provides quick and easy audio input and output connections Platform Power Options On board 9 V battery External 5 V 15 V DC Vcc supply inputs External regulated Vpp supply input Socket for on board 5 V 3 3 V Vpp voltage regulator EVM On boar
21. nded operation the module SE BTL control input pin must be held high The speaker or headphone load is connected to the module OUT output pin through a coupling capacitor and to platform system ground A 470 uF electrolytic coupling capacitor is provided on the platform in the signal path to the headphone output jack for this purpose and a control signal from the platform headphone jack can be routed to the module control input pin to switch the TPA311 IC to the single ended mode In the single ended mode the amplifier inside the TPA311 IC that drives the OUT line does not operate and does not dissipate any power The OUT pin goes into a high impedance state and can be left connected or allowed to float The TPA311 evaluation module can be set for an overall gain of between 2 and 22 by adjustment of the the on board gain control R4 The TPA311 amplifier IC as most other amplifiers exhibits its best distortion and noise performance at lower gain levels see the TPA311 data sheet Even so the TPA311 at its highest gain setting has significantly less distortion than most low cost speakers Gain versus total harmonic distortion THD should be considered in each application Both the module input signal level and the TPA311 module gain should be adjusted to obtain the lowest overall distortion level for a particular overall gain A quick rule of thumb everything else being equal the module input signal level should be as high as possibl
22. o platform Vpp power input connector J6 taking care to observe marked polarity or b Install a voltage regulator EVM SLVP097 or equiv in platform socket U6 Install a 9 V battery in B1 or connect a 7 V 12 V power source to a platform Vcc power input J1 or J2 and jumper the appropriate power input see platform user s guide Inputs and outputs 8 Ensure that signal source level adjustments and EVM gain R4 are set to minimum 9 Connect the audio source to left and right RCA phono jacks J3 and J5 or stereo miniature phone jack J4 10 Connect 8 Q 32 Q speakers to left and right RCA jacks J7 and J9 or to stripped wire connectors J8 Power up 11 Verify correct voltage and input polarity and set the external power supply to ON If Vcc and an on board regulator EVM are used to provide Vpp set platform power switch S1 to ON Platform LED2 should light indicating the presence of Vpp and the evaluation modules installed on the platform should begin operation 12 Adjust the signal source level and EVM gain level R4 as needed Quick Start 2 3 Quick Start List for Stand Alone 2 3 Quick Start List for Stand Alone Use the following steps to use the TPA311 EVM stand alone or when connecting it into existing circuits or equipment Connections to the TPA311 module header pins can be made via individual sockets wire wrapping or soldering to the pins either on the top orthe bottom of the module circuit board Numbered call
23. onnected for BTL Output 000 eee 3 12 3 4 2 TPA311 EVM Connected for Single Ended Output 04 3 13 3 5 TPAS311 Audio Amplifier Evaluation Module Parts List 000220000 3 14 Figures 1 1 The TI TPA311 Audio Amplifier Evaluation Module cee eee ee eee es 1 4 2 1 Quick Start Platform Map 1 eee eee eee 2 2 2 2 Quick Start Module Map ricini cira 0 0 cece Dea Da E E a E eens 2 4 3 1 The TI Plug N Play Audio Amplifier Evaluation Platform 00 cee eeeee 3 2 3 2 Rau MT aiea gaiii i i gai a eai d a a ees 3 3 3 3 TPA311 EVM Schematic Diagram 00 ccc 3 3 3 4 TPAS311 Audio Amplifier IC 2 0 0 2 2c ene 3 4 3 5 Platform Signal Routing and Outputs 0 0 eens 3 7 3 6 Mute Mode and Polarity Control 0 0 cece rh 3 8 3 7 Typical Headphone Plug ccc eect ee dand PAA e 3 11 3 8 TPA311 EVM Connected for Stereo BTL Output 00 eee eee 3 12 3 9 TPA311 EVM Connected for Stereo Single Ended Output 00000 ee 3 13 Tables 2 1 Typical TI Plug N Play Platform Jumper and Switch Settings for the TPA311 2 1 2 2 Platform Jumper and Switch Settings for the TPA311 022 cece eee eee 2 3 3 1 TPAS11 EVM Parts Uist uendere a tenira tinara aii a e a ea a anaa wed 3 14 vi Chapter 1 Introduction This chapter provides an overview of the Texas Instruments TI TPA311 Audio Amplifier Eva
24. outs for selected steps are shown in Figure 2 2 and details appear in Chapter 3 Figure 2 2 Quick Start Module Map VDD GND Shutdown o ng 3 C5 C3 009227 OUT O OUT O U1 Literature Oo SEET SLOP116 o w Eh X53 D GND rpA3 11 Gain Adjust Power supply 1 Ensure that all external power sources are set to OFF 2 Connectan external regulated power supply set to 5 V to the module VDD and GND pins taking care to observe marked polarity Inputs and outputs 3 Ensure that signal source level adjustments and EVM gain R4 are set to minimum 4 Connectthe audio source to the module IN and GND pins taking care to observe marked polarity 5 Connect the Shutdown pin to Vpp through a Normally Open switch 6 For BTL output connect an 8 O 32 O speaker to the module OUT and OUT pins or 7 Forsingle ended output connect a headphone or an 8 O 32 O speaker to the module OUT and GND pins through a 33 uF to 1000 uF output coupling capacitor figure 3 9 Power up 8 Verify correct voltage and input polarity and set the external power supply to ON The EVM should begin operation 9 Adjust the signal source level and EVM gain level R4 as needed 2 4 Quick Start Chapter 3 Details This chapter provides details on the TPA311 IC the evaluation module and the steps in the Quick Start List additional application information and a parts list for the TP
25. plifier EVM gt no o ef U2 U4 Wim em m mom mm m e R U5 R b cat 3 or Stereo enpo J10 EM Headphone S3 Headphone Amplifier L L p Output beeeeeeeeea a e 1 Eg gt U5 3 3 2 1 Signal Conditioning The audio signal from the input jacks can be applied to the signal conditioning socket U1 if an EVM is installed there or socket U1 can be bypassed and the audio input signal applied directly to the inputs of the TPA311 power amplifiers J Switch S2 selects signal conditioning or bypasses it 3 3 2 2 Headphone Output Jack Switch S3 is the source select for the stereo headphone output jack J10 The headphone jack is capacitively coupled via 470 uF electrolytics and can output either the signal from the headphone amplifier in socket U5 or the signal from the TPA311 power amplifiers installed in sockets U3 and U4 as determined by the setting of headphone source select switch S3 When S3 is set to the power amplifier position U2 U4 the headphone jack is connected to the TP311 power amplifier OUT output lines When a plug is inserted into the jack signals output through J10 are returned to platform ground requiring single ended power amplifier operation A switch inside the headphone jack produces a control signal that can be routed to the power amplifier sockets to shut down the TPA311 EVMs when a plug is inserted Source select switch S3 connects the headphone jack to th
26. such applications requires the written approval of an appropriate TI officer Questions concerning potential risk applications should be directed to TI through a local SC sales office In order to minimize risks associated with the customer s applications adequate design and operating safeguards should be provided by the customer to minimize inherent or procedural hazards TI assumes no liability for applications assistance customer product design software performance or infringement of patents or services described herein Nor does TI warrant or represent that any license either express or implied is granted under any patent right copyright mask work right or other 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 Copyright 1998 Texas Instruments Incorporated Preface Related Documentation From Texas Instruments B T Plug N Play Audio Amplifier Evaluation Platform literature number SLOUO 11 provides detailed information on the evaluation platform and its use with TI audio evaluation modules B TPA311 350 mW LOW VOLTAGE AUDIO POWER AMPLIFIER literature number SLOS207 This is the data sheet for the TPA311 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 tested
27. witch Settings for the TPA311 Notes 1 X Don t care 2 Set S2to ON when signal conditioning board is installed in U1 set S2 to OFF when no signal conditioning board is installed Topic Page 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 1 Precautions 2 1 Precautions Power Supply Input Polarity and Maximum Voltage Always ensure that the polarity and voltage of the external power connected to Vcc power input connector J1 J2 and or Vpp power input connector J6 are correct Overvoltage or reverse polarity power applied to these terminals can open on board soldered in fuses and cause other damage to the platform installed evaluation modules and or the power source Inserting or Removing EVM Boards Do not insert or remove EVM boards with power applied damage to the EVM board the platform or both may result Figure 2 1 Quick Start Platform Map peg fp MoA OE DC Power In Out a Sh R1 m o 89 oS ES Signal Conditioning S e m 8g 8 O l Speaker O Output E e e B Oo Q Fa 6 2 2 9 Q C AUTION Do not insert or re Z664 SLNAWNYLSNI Headphone Output
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