Texas Instruments SLOU020A Stereo Amplifier User Manual
Contents
1. Amplifier EVM i gt J7 J8 J9 3 S2 ERA Speaker SY u4 gt Outputs A Le TPA311 eL L e o Amplifier EVM gt n eee ccccccee a U2 U4 pan R gt 4 US R s Stereo 4 i enpo gt T J10 LA Headphone Ss3 t Headphone Amplifier L Lp Output EA i o L 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 YU 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 MSOP EVMs when2. 20 kQ 1 16 W 5 Resistor 39 kQ 1 16 W 5 Switch momentary Terminal Post Headers IC TPA311DGNT audio amplifier 350 mW mono PCB TPA311 MSOP EVM Size A 0603 0603 0603 0603 MSOP 8 EVM Qty 1 1 Manufacturer Part Number Panasonic ECS TOJY106R Murata GRM39 Y5V105Z10PT Panasonic ECU V1HO50CCV Panasonic ERJ 3GSYJ203 Panasonic ERJ 3GSYJ393 Panasonic P8048SCT ND Sullins PTC36SABN TI TPA311 Vendor Number Digi Key PCS1106CT ND Digi Key PCCO50CVCT ND Digi Key P20KGCT ND Digi Key P39KGCT ND Digi Key P8048SCT ND Digi Key 1022 36 ND T Due to the very small size of the MSOP IC package the standard part number TPA311 is replaced with the code TIAAB Note All items are SMD except as noted Details
3. EVM Schematic Diagram 0 0 000 c cece teens 3 3 3 4 TPA311 Audio Amplifier IC 0 00 oac en O teen eens 3 4 3 5 Platform Signal Routing and Outputs 00 eee eee 3 7 3 6 Mute Mode and Polarity Control 0 00 c cece eee enna 3 8 3 7 Typical Headphone Plug 0 0 cece teen eens 3 11 3 8 TPA311 MSOP EVM Connected for Stereo BTL Output 00 cee eee 3 12 3 9 TPA311 MSOP EVM Connected for Stereo Single Ended Output 3 13 Tables 2 1 Typical TI Plug N Play Platform Jumper and Switch Settings for the TRASATMSOR EVM ctra e RS eee 2 1 2 2 Platform Jumper and Switch Settings for the TPA311 MSOP EVM 2 3 3 1 TPA311 MSOP EVM Parts LiSt oooooccccccccccoccno eee tte eens 3 14 vi Chapter 1 Introduction This chapter provides an overview of the Texas Instruments TI TPA311 MSOP audio amplifier evaluation module SLOP 123 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 dal Feature Highlights aa a E E 1 2 1 27 Description asa lo 1 3 1 3 TPA311 MSOP EVM Specifications oooooommmmmconnnn 1 3 Feature Highlights 1 1 Feature Highlights The TI TPA311 MSOP audio amplifier evaluation module and the TI plug n play audio amplifier evaluation platform include the following features J TPA311 Low Voltage Audio Pow
4. 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 TPA311 MSOP evaluation module Topic Page SAP recae aaa oe falacia aaa ale 3 2 3 2 The TPA311 MSOP Audio Power Amplifier Evaluation Module 3 3 3 3 Using The TPA311 MSOP EVM With The Plug N Play Evaluation Platform e e a a tooo ace 3 6 3 4 Using The TPA311 MSOP EVM Stand Alone 3 12 3 5 TPA311 MSOP Audio Power Amplifier Evaluation Module Parts List 2cc cece ence eens 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 onboard 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
5. is shown in Figure 3 3 Figure 3 2 TPA311 MSOP EVM Vdd GND Shutdown O O C5 Be x R2 GND O R4 Ci R3 OUT O O SE BTL EM C4 TEXAS INSTRUMENTS aed O IN SLOP123 O GND TPA311 MSOP EVM T Due to the very small size of the MSOP IC package the standard part number TPA311 is replaced with the code TIAAB Figure 3 3 TPA311 MSOP EVM Schematic Diagram VDD 25Vto5 5V cos GND O i 0 uF Shutdown R1 20 kQ c2_L du ee N C3 SE BTL fur GND R4 C1 20ka OUT 1 uF e AL c4 Audio Input 5pF R2 GND 20 KQ Details 3 3 The TPA311 MSOP 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 5 V and 5 5 V and deliver up to approximately 350 mW into an 8 Q BTL Figure 3 4 Typical applications in clude portable phones toys games and similar hand held audio applications Figure 3 4 TPA311 Amplifier IC 6 VDD 4 4 IN 5 Vo 2 Bypass 8 Vo 1 Shutdown 7 3 ND SE BTL G The IC includes two sep
6. 2 2 and details appear in Chapter 3 Figure 2 2 Quick Start Module Map Vdd GND O O Shutdown O 9 s f f Rt C2 c 1 OUT O F R2 l GND O 6 C1 R3 OUT O O SE BTL C4 TEXAS INSTRUMENTS y O IN 4 SLOP123 TPA311 MSOP EVM O GND T Due to the very small size of the MSOP IC package the standard part number TPA311 is replaced with the code TIAAB UY Power supply 1 Ensure that all external power sources are set to OFF 2 Connect an external regulated power supply set to 5 V to the module VDD and GND pins taking care to observe marked polarity J Inputs and outputs 3 Ensure that the signal source level is set to minimum 4 Connect the 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 Q 32 Q speaker to the module OUT and OUT pins or 7 For single ended output connect a headphone or an 8 Q 32 Q speaker to the module OUT and GND pins through a 33 uF to 1000 uF output coupling capacitor figure 3 9 J 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 as needed 2 4 Quick Start Chapter 3 Details
7. FF when no signal conditioning board is installed Topic Page a A E tetera A O A E OG 2 2 2 2 Quick Start List for l cece eee e eee e nent eens 2 3 2 3 Quick Start List for Stand Alone 0 0000 c cece cece eee eeees 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 onboard 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 DC Power In Out GQ R1 lt m Sm Audio 59 2 Oe Power 2 Signal Conditioning S 8 8 O O oF g 210 E eS N peaker sold lo o O Output S710 a 16 jo E A Ns O 29 a O O O C AUTION Do not insert or re f Z664 SLNAWNYLSNI Headphone Output SVX4L 2 2 Quick Start Quick S
8. TPA311 MSOP Audio Power Amplifier Evaluation Module User s Guide 2001 Mixed Signal Products SLOU020A IMPORTANT NOTICE Texas Instruments and its subsidiaries Tl reserve the right to make changes to their products or to discontinue any product or service without notice and advise customers to obtain the latest version of relevant information to verify before placing orders that information being relied on is current and complete All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment including those pertaining to warranty patent infringement and limitation of liability Tl warrants performance of its products to the specifications applicable at the time of sale in accordance with TP 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 Customers are responsible for their applications using TI components In order to minimize risks associated with the customer s applications adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards Tl assumes no liability for applications assistance or customer product design TI does not warrant or represent that any license either express or implied is granted under
9. a plug is inserted Source select switch S3 connects the headphone jack to the output lines of either the headphone amplifier socket U5 or the power amplifier sockets U2 US Mm 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 m 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 MSOP EVMs are to drive single ended loads connected to J10 Details 3 7 Using The TPA311 MSOP EVM With the Plug N Play Evaluation Platform 3 3 3 Mute Mode The TPA311 MSOP 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 ultralow 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 out
10. aluation Platform literature number SLOU011 provides detailed information on the evaluation platform and its use with TI audio evaluation modules mM 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 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 Tlis a trademark of Texas Instruments Incorporated Contents INTFOQUCHON 0005 cc ie n niaaa tee E cchcta le toile Sota eee ee aie eels a aie ee ails 1 1 1 1 Feature FINDS voii AA 1 2 1 2 DesSCrplON viii A A 1 3 1 3 TPA311 MSOP EVM Specifications 0 0c ccc nana 1 3 Quick SH ee ee de a a E E a a a a a a aa aa e 2 1 2 1 PROGAULONS or awe ee EEE dae ae EATE awa A ay 2 2 2 2 Quick Start List for Platform aunan aunan eens 2 3 2 3 Quick Start List for Stand Alone lt ferreae te eni aa DEER eee eee 2 4 Detalls 2 chitin a eee ee
11. any patent right copyright mask work right or other intellectual property right of Tl covering or relating to any combination machine or process in which such products or services might be or are used TI s publication of information regarding any third party s products or services does not constitute Tl s approval license warranty or endorsement thereof Reproduction of information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties conditions limitations and notices Representation or reproduction of this information with alteration voids all warranties provided for an associated TI product or service is an unfair and deceptive business practice and TI is not responsible nor liable for any such use Resale of Tl s products or services with statements different from or beyond the parameters stated by TI for that product or service voids all express and any implied warranties for the associated TI product or service is an unfair and deceptive business practice and TI is not responsible nor liable for any such use Also see Standard Terms and Conditions of Sale for Semiconductor Products www ti com sc docs stdterms htm Mailing Address Texas Instruments Post Office Box 655303 Dallas Texas 75265 Copyright 2001 Texas Instruments Incorporated Preface Related Documentation From Texas Instruments E TI Plug N Play Audio Amplifier Ev
12. arate 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 MSOP Audio Power Amplifier Evaluation Module 3 2 3 Single Ended Operation 3 2 4 Module Gain 3 2 5 Shutdown For single ended operation th
13. ate ate ears 3 1 3 1 Precautions 000 ecu ate teen age sale a Pista steed ba ae on ee 3 2 3 2 The TPA311 MSOP Audio Amplifier Evaluation Module 02 2020005 3 3 3 2 1 TPA311 Audio Amplifier IC 0 0 00 3 4 3 2 2 B TEOperatiOM ri dE ER Rca 3 4 3 2 3 Single Ended Operation oooccccccocconconacnc nar 3 5 32 47 Module Gala ticas 3 5 32 97 SHUTGOWN 00 a ia ad 3 5 3 3 Using The TPA311 MSOP EVM With The Plug N Play Evaluation Platform 3 6 3 3 1 Installing and Removing EVM Boards 0 cece eee eee ees 3 6 SZ gt Signal AQUINO rta a iiem A AETA 3 7 3 33 Mute Mode recia a hee seated nee e E 3 8 3 3 4 Power Requirements 02 cece teens 3 10 3 3 5 Inputs and Outputs 0 0 eee eee eens 3 11 3 4 Using The TPA311 MSOP EVM Stand ALone 0000 cece eee 3 12 3 4 1 TPA311 MSOP EVM Connected for BTL Output 004 3 12 3 4 2 TPA311 MSOP EVM Connected for Single Ended Output 3 13 3 5 TPA311 MSOP Audio Amplifier Evaluation Module Parts List 3 14 Figures 1 1 The TI TPA311 MSOP Audio Amplifier Evaluation Module 02000000 1 3 2 1 Quick Start Platform Map 1 cece nent eens 2 2 2 2 Quick Start Module Map 00 ccc eect ete teen eens 2 4 3 1 The TI Plug N Play Audio Amplifier Evaluation Platform 0 2 cee eee eee 3 2 3 2 TPASIT MSOP EVM cate kia kA ee his e aah A da 3 3 3 3 TPA311 MSOP
14. ch that only the correct type of EVM can be installed in a particular socket and then only with the proper orientation 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 MSOP 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 Off a ri a Conditioning U3 e gt a A TPA311 R R 1 e
15. ckets Figure 3 5 When the TPA311 output signal is routed to J10 by S3 signals output via J10 are returned to platform ground when aplug is inserted Figure 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 MSOP EVM Stand Alone 3 4 Using The TPA311 MSOP EVM Stand Alone Using the TPA311 MSOP audio power amplifier evaluation module stand alone is much the same as using it with the platform The same 2 5 V to 5 5 V power supply range and the isolated OUT and OUT lines for BTL operation requirement 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 1 TPA311 MSOP EVM Connected for BTL Output Figure 3 8 TPA311 MSOP EVM Connected for Stereo BTL Output 5 VDC Shutdown 1 R1 Right l TEXAS Audio INSTRUMENTS Input gt Right O GND SLOP123 TPA311 MSOP EVM Shutdown External Mute Control gt oe active high Left TEXAS Audio INSTRUMENTS Input gt Left O GND SLOP123 TPA311 MSOP EVM t Due to the very small size
16. e 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 MSOP evaluation module has a set gain of 2 However the gain can be adjusted to a maximum of 22 by changing the value of resistor R3 Figure 3 3 Use the following equation to determine value of Ra R Gain m Ra 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 MSOP module gain should be adjusted to obtain the lowest overall distortion level for a particular overall gain A quick rule of thumb ev
17. er 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 Q 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 J 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 O Platform Power Options Onboard 9 V battery External 5 V 15 V Vcc supply inputs External regulated Vpp supply input Socket for onboard 5 V 3 3 V Vpp voltage regulator EVM Onboard overvoltage and reverse polarity power protection Y 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 Description 1 2 Description The TPA311 MSOP audio power amplifier evaluation module is a complete low power single channel audio power amplifier It consists of the TI TPA311 350 mW lo
18. erything else being equal the module input signal level should be as high as possible without clipping or overloading the TPA311 input and the TPA311 gain should be kept as low as possible When the shutdown terminal of the TPA311 amplifier IC is taken high the IC ceases operation and enters an ultralow power state This is accomplished by applying a control signal to the module shutdown pin or by pressing the shut down switch S1 on the module When the control signal goes low or is re moved 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 MSOP EVM With the Plug N Play Evaluation Platform 3 3 Using The TPA311 MSOP EVM With the Plug N Play Evaluation Platform 3 3 1 The TPA311 MSOP 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 MSOP 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 su
19. g the control signal from the platform headphone jack jumper JP6 to MUTE mM To switch the output mode of the TPA311 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 Y When JP6 is set to mute use the following JP8 settings for the TPA311 mM To mute the TPA311 MSOP amplifier module when a plug is inserted into the headphone jack jumper JP8 to Hi this is the typical setting mM To mute the TPA311 MSOP amplifier module until a plug is inserted into the headphone jack jumper JP8 to Lo Y When JP6 is set to mode use the following JP8 settings for the TPA311 m To switch the TPA311 MSOP 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 mM To switch the TPA311 MSOP 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 MSOP audio power amplifier evaluation module can operate from any voltage between approximately 2 5 V and 5 5 V however the TPA311 amplifier IC on the module is characterized for operation at 3 3 V a
20. nd 5 V For best performance highest output power with lowest distortion the module should be operated at approximately 5 V unless there is a specific 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 onboard 9 V battery Or an external regulated power source can be used to supply Vpp voltage to the platform and the TPA311 MSOP 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 YU Vpp voltage applied to platform screw terminals J6 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 Inno 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 O 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
21. o o O O lt w O D n C E y DC Power In Out Power Input 8 O on O O 8 lo 8 a JO O O 9 8 ete O O Speaker p Output oo jo JO O ee Le a JO Q Z O jo E 2 Q O 2 Q O C AUTION O Do not insert or remove O EVM boards with power applied O Headphone Output Plug N Play Audio Amplifier Evaluation Platform SLOP097 Rev C 1 3 2 Details The TPA311 MSOP Audio Power Amplifier Evaluation Module 3 2 The TPA311 MSOP Audio Power Amplifier Evaluation Module The TPA311 MSOP audio power amplifier evaluation module is powered by a TPA311 350 mW low power audio amplifier IC includes a shutdown control signal input with onboard 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 plug board based prototyping systems Or the EVM can be wired directly into existing circuits and equipment when used stand alone The module appears in Figure 3 2 and its schematic
22. of the MSOP IC package the standard part number TPA311 is replaced with the code TIAAB Note The SE BTL SE BTL EVM pin is pulled to GND through a 20 KQ resistor on the module 3 12 Details 3 4 2 TPA311 MSOP EVM Connected for Single Ended Output Using The TPA311 MSOP EVM Stand Alone Figure 3 9 TPA311 MSOP EVM Connected for Stereo Single Ended Output Audio 5 VDC Shutdown s k f R1 R3 O SE BTL E C4 TEXAS Input gt INSTRUMENTS O IN Gane SLOP123 Right j External Mute Control gt TPA311 MSOP EVM Shutdown active high Audio Input gt R3 O SE BTL TEXAS INSTRUMENTS SLOP123 Left i TPA311 MSOP EVM 33 uF T 1000 uF p 33 uF 1000 uF T Due to the very small size of the MSOP IC package the standard part number TPA311 is replaced with the code TIAAB Details 3 13 TPA311 MSOP Audio Power Amplifier Evaluation Module Parts List 3 5 TPA311 MSOP Audio Power Amplifier Evaluation Module Parts List Table 3 1 TPA311 MSOP EVM Parts List Ref C5 C1 C2 C3 C4 R1 R2 R4 R3 S1 U1 PCB1 Description Capacitor 10 uF 6 3 V Capacitor 1 uF 80 20 nonpolarized Capacitor 5 pF Resistor
23. 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 J Inputs and outputs 8 Ensure that signal source level is 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 J 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 as needed Quick Start 2 3 Quick Start List for Stand Alone 2 3 Quick Start List for Stand Alone Follow these steps to use the TPA311 MSOP EVM stand alone or when connecting it into existing circuits or equipment Connections to the TPA311 MSOP module header pins can be made via individual sockets wire wrapping or soldering to the pins either on the top or the bottom of the module circuit board Numbered callouts for selected steps are shown in Figure
24. put mode When the mode control input is tied to GND the module operates in the BTL output mode 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 or not a plug is inserted in J10 Figure 3 6 Mute Mode and Polarity Control 3 8 VDD Polarity JP8 JP6 CA J10 ue Mode u3 U4 Headphone Power Jack Hi Mute Amplifiers R5 SPK RES 1kQ U2 U4 Details Using The TPA311 MSOP 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 m To mute the TPA311 MSOP amplifier module usin
25. s included with the platform to hook up 1 3 TPA311 EVM Specifications Supply voltage range VDD eee cece ee teen eee e nena 2 5 V to 5 5 V S pplyc rent DD gine re e raa ace 250 mA max Continuous output power Po 8 Q BTL Vpp 5 Vi see eee eee ee 350 mW 32 QO BIL VppH5 Vio wwe eect eens 75 mW Audio input voltage Vj 2 eee 2 Vpp max Minimum load impedance RL oocccccccccnccccn ees 8Q Introduction 1 3 Introduction Chapter 2 Quick Start The steps in this chapter can be followed to quickly prepare the TPA311 MSOP audio amplifier EVM for use Using the TPA311 MSOP EVM 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 However 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 MSOP EVM and will cause the TPA311 IC 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 Switch Settings for the TPA311 MSOP EVM EVM JP6 JP7 JP8 S2 3 TPA311 Mode xX Hi Note 2 X Notes 1 X Don t care 2 Set S2 to ON when signal conditioning board is installed in U1 set S2 to O
26. tart List for Platform 2 2 Quick Start List for Platform Follow these steps when using the TPA311 MSOP 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 J Platform preparations 1 Ensure that all external power sources are set to OFFand thatthe platform power switch 1 is set to OFF 2 Install a TPA311 MSOP module in platform sockets U3 and UA 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 Set control 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 U4 Table 2 2 Platform Jumper and Switch Settings for the TPA311 MSOP EVM EVM JP6 JP7 JP8 S2 3 TPA311 Mode X Hi Note 2 X Notes 1 X Don t care 2 Set S2 to ON when signal conditioning board is installed in U1 set S2 to OFF when no signal conditioning board is installed YU Power supply 7 Select and connect the power supply a Connect an external regulated power supply set to a voltage between 2 5 V and 5 5 V to
27. w voltage audio power amplifier IC in a very small MSOP package 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 Vdd GND O O Shutdown S1 R1 C2 R2 C1 O SE BTL R4 TEXAS INSTRUMENTS SLOP123 TPA311 MSOP EVM T Due to the very small size of the MSOP IC package the standard part number TPA311 is replaced with the code TIAAB 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 MSOP 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 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 speaker
28. 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 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 so
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