Texas Instruments TPA005D12 User's Manual
Contents
1. 0 02 0 01 0 1 1 2 Po Output Power W Details 3 21 TPA005D12 Class D EVM Performance Characteristics Figures 3 14 and 3 15 show a frequency sweep for a 1 W output The lower frequency distortion of the graphs is dominated by noise while the distortion at higher frequencies is due primarily to the fast changing duty cycle of the PWM output Figure 3 14 Class D Amplifier Distortion versus Frequency at 1 W Into 4 Q TOTAL HARMONIC DISTORTION PLUS NOISE vs FREQUENCY S 1 T ji 2 Vpp 5V 2 RL 40 2 Po 1W 25 a 9 2 2 5 01 E lt 5 2 2 0 02 20 100 ik 10k 20k f Frequency Hz Figure 3 15 Class D Amplifier Distortion versus Frequency at 1 W Into 8 Q TOTAL HARMONIC DISTORTION PLUS NOISE vs FREQUENCY 55 e 1 T T for CA Vpp 5V 2 80 2 1 E 25 amp c 5 2 2 5 01 E G rI 5 2 2 0 02 20 100 1k 10k 20k f Frequency Hz 3 22 Details TPA005D12 Class D EVM Performance Characteristics EVM crosstalk is shown in Figures 3 16 and 3 17 The frequency is swept from 20 Hz to 20 kHz for2. 3 18 3 5 2 Input Connections 3 19 3 5 8 Output 3 19 3 5 4 Controls and Indicators 3 19 3 6 005 12 Class D EVM Performance Characteristics 3 20 3 7 TPAO005D12 Class D EVM 1 3 24 3 8 TPAO005D12 Class D EVM Bill of Materials 3 25 3 9 TPA005D12 Class D EVM Schematic 3 26 3 10 TPA005D12 Class D EVM PCB Layers 3 27 Figures LL JE bot dot do dud d X s CT d lal a PT d lb lade PO OANDOoaARWNH AO P 3 20 3 21 3 22 3 23 3 24 TPA005D12 Class D Stereo Audio Power Amplifier EVM Top View 1 3 The TI TPA005D12 Class D Stereo Audio Power Amplifier EVM Bottom View 1 3 Quick Start Platform Map 2 2 The TI Plug N Play Audio Amplifier Evaluation Platform 3 2 The TI TPA005D12 Class D Stereo Audio Power Amplifier EVM Top View 3 4 The TI TPA005D12 Class D Stereo Audio Power Amplifier EVM Bottom View 3 4 TPA005D12 Class D EVM Schematic Diagram
3. 3 5 Class D Functional Diagram 3 6 Class D Input and Output 3 7 Platform Signal Routing and Outputs 3 13 Mute Mode and Polarity 3 14 Typical Headphone Plug 3 17 TPA005D12 Class D EVM Stand Alone Connections for Stereo BTL Output 3 18 Class D Amplifier Frequency Response at 4 3 20 Class D Amplifier Distortion versus Output Power at 4 Q 3 21 Class D Amplifier Distortion versus Output Power at 8 Q 3 21 Class D Amplifier Distortion versus Frequency at 1 W Into 4 3 22 Class D Amplifier Distortion versus Frequency at 1 W Into 8 3 22 Class D Amplifier Crosstalk versus Frequency at 2 W Into 4 3 23 Class D Amplifier Crosstalk versus Frequency at 2 W Into 8 3 23 TPA005D12 Class D EVM Schematic Diagram 3 26 TPA005D12 Class D EVM Top Assembly 3 27 TPA005D12 Class D EVM Bottom Assembly 3 27 TPA005D12 Class D EVM Top Layer 3 2
4. DC Power Power In Out Input i R1 4 89 Signal Conditioning S fr Output o amp 8 0 2 xe O AUTION Do not insert or remove EVM boards with power applied Headphone Output Plug N Play Audio Amplifier Evaluation Platform SLOP097 Rev C 1 3 2 Details The TPA005D12 Class D Audio Power Amplifier Evaluation Module 3 2 The TPA005D12 Class D Audio Power Amplifier Evaluation Module The TPA005D12 class D stereo audio power amplifier evaluation module is powered by a TPA005D12 class D stereo power amplifier integrated circuit The EVM is capable of delivering greater than 2 W of continuous average power per channel into 4 O loads at less than 0 6 THD N over a 20 Hz to 20 kHz frequency range from a 5 V supply The TPA005D12 amplifier IC operates in the bridge tied load BTL mode for maximum efficiency during class D operation The high IC switching frequency reduces the size of the output filterto three small capacitors and two small inductors per class D channel The evaluation module includes onboard pushbutton switches for manual muting and shutdown and input pins for logic control of mode mute and shutdown 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 underside of the b
5. TEXAS INSTRUMENTS 5012 Class D Stereo Audio Power Amplifier Evaluation Module User s Guide August 1999 Mixed Signal Products SLOU051A IMPORTANT NOTICE Texas Instruments and its subsidiaries 1 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 acknowledgement including those pertaining to warranty patent infringement and limitation of liability TI warrants performance of its semiconductor products 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 SEMICONDUCTOR PRODUCTS NOT DESIGNED AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFE SUPPORT DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS INCLUSION OF TI PRODUCTS IN SU
6. 3 R 62 U2 U3 gt 07 08 09 Audio 1 Signal 52 A i Speaker Input Conditioning 1 mu 1 g L L e gt 4 Ori U2 U4 R U5 gt 1 Stereo i enp J10 Headphone S3 Headphone Amplifier L Output e ne L 3 4 3 1 Signal Conditioning The audio signal from 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 TPA005D12 class D EVM Platform switch S2 selects signal conditioning or bypasses it 3 4 3 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 power amplifier installed in socket U2 as determined by the setting of headphone source select switch S3 The platform headphone output jack J10 is not used in conjunction with the TPA005D12 class D EVM Switch S3 should be set to the U5 position when the TPA005D12 class D EVM is installed on the platform Details 3 13 Using The TPA005D12 Class D EVM With the Plug N Play Platform 3 4 4 Shutdown The TPA005D12 class D EVM is equipped with a
7. 3 2 TPA005D12 Class D Audio Power Amplifier EVM 3 3 3 3 Class D Amplifier Design Considerations 3 10 3 4 Using The TPA005D12 Class D EVM With the P N P Platform 3 11 3 5 Using The TPA005D12 Class D EVM Stand Alone 3 18 3 6 TPA005D12 Class D EVM Performance Characteristics 3 20 3 7 TPAO005D12 Class D EVM Interconnects 3 24 3 8 TPA005D12 Class D Evaluation Module Parts List 3 25 3 9 TPA005D12 Class D EVM Schematic 3 26 3 10 TPA005D12 Class D EVM PCB Layers 3 27 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 c TH AlddAS
8. Class D EVM Bill of Materials 3 8 TPAO005D12 Class D EVM Bill of Materials The components in the bill of materials Table 3 5 were selected for their common values availability and the smallest size available to meet these criteria Table 3 5 TPA005D12 Class D EVM Bill of Materials Reference Description EUM Qty Part Number 17 Capacitor Ceramic Chip 0 1 uF 10 0805 1 Kemet 50 V X7R C0805C104K5RAC C2 C4 Capacitor Ceramic Chip 1 uF 10 1206 10 TDK C8 C10 C11 16 V X7R C3216X7R1C105K C15 C16 C24 C25 C18 C19 Capacitor Ceramic Chip 47 nF 10 0805 2 Kemet 50 V X7R C0805V473K5RAC C5 C6 C7 Capacitor Ceramic Chip 470 pF 5 0805 3 Kemet 50 V COG C0805C471J5GAC C9 C12 Capacitor Ceramic Chip 10 uF 80 20 1210 2 muRata 25 V Y5V GRM235Y5V 106225 C13 C14 These pads are provided for increase of bulk 0 0236 x capacitance as required to meet voltage ripple 0 138 and temperature operating range specifications C20 C21 C22 Capacitor Ceramic Chip 0 22 uF 10 1206 4 Kemet C23 16 V X7R C1206C224K4RAC L1 L2 L3 L4 Inductor SMT 15 uH 20 2 2 ADC 47 2 0 398 x 0 398 4 TDK 1 kHz 20 to 90 C x 0 220 SLF10145 150 L1 L2 L3 L4 Inductor SMT 15 uH 20 1 1 ADC 75 mQ 0 276 x 0 276 4 TDK Alternate Value 1 kHz 20 to 85 C x 0 126 SLF7032 150 R1 R2 Resistor Thick Film Chip SMD 100 5 0603 2 Vishay Dale 1
9. Details e 3 1 3 1 ize cce MAT 3 2 3 2 TPA005D12 Class D Audio Power Amplifier Evaluation Module 3 3 3 2 1 005012 Class D Stereo Audio Amplifier IC 3 5 3 2 2 Overview of Class D Audio Amplifiers 3 6 3 2 3 Bridge Tied Load BTL Operation 3 7 3 2 4 Class D Differential Inputs 3 8 3 2 5 Control and Indicator Circuits 3 8 3 2 6 TPA005D12 Class D EVM Test 3 9 3 3 Class D Amplifier Design Considerations 3 10 3 4 Using The TPA005D12 Class D EVM With the Plug N Play Platform 3 11 3 4 1 Installing and Removing EVM Boards 3 11 3 4 2 Module Switches 3 12 34 3 Signal ROWING usu eect ated dad a actor a oed gud ee ado daa 3 13 39 44 SHUGOWN 1342255 RI Ree E ur EROR E ee dea Xu ra ee 3 14 3 4 5 Power 3 16 3 4 6 Inputs and Outputs 3 17 3 5 Using The TPA005D12 Class D EVM Stand Alone 3 18 3 5 1 Power Connections
10. Table FAULT 0 FAULT 1 TP 2 TP 3 DESCRIPTION No fault The device is operating normally Charge pump under voltage lockout VCP UV fault the charge pump voltage is PVDD 6V All low side transistors are turned on shorting the load to ground Normal operation resumes when the charge pump voltage is restored not a latched fault however the Fault indication remains active until cleared by cycling MUTE SHUTDOWN or the power supply Over current fault the output current limit has been exceeded All output transistors are switched off causing the load to see a high impedance state This is a Jatched fault and is cleared by cycling MUTE SHUTDOWN or the power supply Thermal fault the internal junction temperature has exceeded 125 C All of the low side transistors are turned on shorting the load to ground Once the junction temperature drops by 20 and is below 125 C normal operation resumes not a latched fault The Fault indication remains active until cleared by cycling MUTE SHUTDOWN or the power supply 3 8 Details The TPA005D12 Class D Audio Power Amplifier Evaluation Module 3 2 6 005012 Class D EVM Test Points Test points have been included on the TPA005D12 class D EVM to facilitate user analysis of device performance and design adjustments Table 3 2 lists each test point and its corresponding function Table 3 2 TPA005D12 Class D EVM Test Points s vonz Probe VDD power inp
11. a constant 2 W output Several factors affect crosstalk such as component selection especially the inductor filter layout grounding and power supply decoupling Figure 3 16 Class D Amplifier Crosstalk versus Frequency at 2 W Into 4 Q 20 30 Vpp 5V RL 42 Po 2W 25 CROSSTALK vs FREQUENCY 40 50 Crosstalk dB 60 70 80 90 20 100 1k 10k 20k f Frequency Hz Figure 3 17 Class D Amplifier Crosstalk versus Frequency at 2 W Into 8 Q 20 30 Vpp 5V RL 82 Po 1W TA 25 C CROSSTALK vs FREQUENCY 40 50 Crosstalk dB 60 70 90 20 100 1k 10k 20k f Frequency Hz Details 3 23 TPA005D12 Class D EVM Interconnects 3 7 TPA005D12 Class D EVM Interconnects Table 3 4 shows the correlation between the TPA005D12 class D amplifier IC pins the EVM pins and the plug n play PNP platform sockets Table 3 4 TPA005D12 Class D EVM Plug N Play Platform Interconnects CLASS D EVM PLUG N PLAY PLATFORM IC PIN EVM PIN FUNCTION ON EVM PNP SOCKET FUNCTION ON PLATFORM 8 9 16 21 28 VDD Power for left channel input and VDD Power from J1 J2 J6 or B1 headphone circuits 40 33 VDD2 Power for right chan
12. and right RCA jacks J7 and J9 or to stripped wire speaker connectors J8 J Power up 12 Verify correct voltage and input polarity and set the external power supply to ON Platform LED2 should light indicating the presence of Vpp and the evaluation module s installed on the platform should begin operation 13 Set switch S2 to ON if tone control board SLOP109 is installed in U1 14 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 2 4 Follow these steps to use the TPA005D12 class D EVM stand alone or to connect it into existing circuits or equipment Connections to the TPA005D12 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 Power supply 1 2 Ensure that all external power sources are set to OFF Connect an external regulated power supply set to 5 V to the module VDD VDD2 and GND pins taking care to observe marked polarity It is only necessary to use the ground pins adjacent to the module power pins Inputs and outputs 3 4 Ensure that audio signal source level adjustments are set to minimum Connect the audio source to the module RIN RIN and LIN LIN pins for class D operation taking care to observe marked polarity For single ended input the negative input pins RIN and LIN should be connected t
13. shutdown control input pin When this input is tied to GND the TPA005D12 amplifier IC on the module enters the shutdown mode and dissipates very little power When the EVM control input is tied to Vpp or allowed to float amplifier operation resumes In typical applications as often found in notebook computers and other portable audio products 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 muted to conserve power The TPA005D12 EVM shutdown control pin connects to the platform Mute line of JP6 when the EVM is inserted in the plug n play platform When JP6 is set to Mute and JP8 is set to Lo the class D EVM will operate normally until a headphone plug is inserted into platform jack J10 and the class D amplifier is placed into shutdown Once the jack is removed from J10 the class D EVM again becomes active Note that when JP6 is setto mute and the class D EVM shutdown pin is activated the platform current increases by approximately 20 mA This current is set by the connection of the 240 O platform resistor R3 to ground through the EVM shutdown switch 3 4 4 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 8 Each
14. 12 class D stereo audio power amplifier evaluation module andthe TI plug n play audio amplifier evaluation platform include the following features TPA005D12 Class D Stereo Audio Power Amplifier Evaluation Module Internal depop circuitry to greatly reduce turn on transients in outputs Dual channel bridge tied load BTL only operation 5 V operation 2 W BTL output into 4 O at 5 V Low current consumption in shutdown mute mode 50 uA 2 5 mA Internal gain set to 20 dB IC shutdown and mute control inputs TTL logic level High efficiency CE tested and approved LJ Quick and Easy Configuration With The TI Plug N Play Audio Amplifier Evaluation Platform Evaluation module is designed to simply plug into the platform automatically 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 External 5 V 15 V 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 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 Miniat
15. 16 W 150 V 50 to 150 C 200 ppm C CRCWO0603104J Headers 0 100 in centers 1 2 in length 0 5 0 25 14 Samtec 0 1 TSW 19 8 G S TP1 TP2 TP3 Test Point Red 10 Farnell TP5 TP11 240 345 TP4 TP12 Test Point Black 2 Farnell 240 333 1 52 Switch Momentary Push Button 12 VDC 0 291 x 0 138 2 Panasonic 50 mA x 0 134 EVQ PJS04K U1 IC Audio amplifier class D TSSOP48 1 Tl 2 W 48 pin DCA pkg TPA005D12DCA Details 3 25 TPA005D12 Class D EVM Schematic 3 9 TPA005D12 Class D EVM Schematic The following schematic depicts the TPA005D12 class D EVM Note C13 and C14 are optional and have been provided to allow flexibility of design Figure 3 18 TPA005D12 Class D EVM Schematic Diagram VDD 100k 100k 15V d TPA005D12 lt 2 FE SHUTDOWN cosc E lt AGND Mute al acis AGND 46 470pF LIN z C3114F 4 LINN RINN C2 1uF 5 C4 0 4 LINP RINP A470pFl67 RIN C64 470pF comp RCOMP p C13 C9 C10 SEJE 7 AGND FAULT 0 2 Ct Ci2 C14 10 14F VDD FAULT 1 TP3 1uF 10uF VDD LPVDD RPVDD 140 VDD2 LOUT 10 LOUTP ROUTP C20 L1 I ul L2 C23 1 5uH LOUTP ROUTP 1 5uH C24 0 22uF PGND PGND 0 224F C25 13 36 WIE nem LOUT LOUTN ROUTN E ROUT LPVDD RPVDD 3 17 18 Nc 19 uc 20 21 16 C15 tuFT C19 0 047uF 3 26 Details TPA005D12 Class D EVM PCB Layers 3 10 TPA005D12 Class D EVM
16. 8 TPA005D12 Class D EVM Second Layer 3 28 TPA005D12 Class D EVM Third Layer 3 29 TPA005D12 Class D EVM Bottom Layer 3 29 Tables vi Typical TI Plug N Play Platform Jumper and Switch Settings for the 005012 Class D EVM 2 1 Platform Jumper and Switch Settings for the TPA005D12 2 3 TPA005D12 Class D EVM Fault Indicator Table 3 8 TPA005D12 Class D EVM Test Points 3 9 Platform Jumper and Switch Settings for the TPA005D12 EVM Power Inputs 3 16 TPA005D12 Class D EVM Plug N Play Platform Interconnects 3 24 005012 Class D EVM Bill of Materials 3 25 Chapter 1 Introduction This chapter provides an overview of the Texas Instruments TPA005D12 class D stereo audio power amplifier evaluation module SLOP246 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 Vel 1 2 Ws Description 1 3 1 3 005012 Class D EVM Specifications 1 4 Feature Highlights 1 1 Feature Highlights The TI TPA005D
17. CH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER S RISK 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 does not 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 5 publication of information regarding any third party s products or services does not constitute Tl s approval warranty or endorsement thereof Copyright 1999 Texas Instruments Incorporated Preface Related Documentation From Texas Instruments B 7 Plug N Play Audio Amplifier Evaluation Platform T Literature Number SLOU011 provides detailed information on the evaluation platform and its use with audio evaluation modules 7PA005D12 CLASS D STEREO AUDIO POWER AMPLIFIER TI Literature Number SLOS246 This is the data sheet for the TPA005D12 audio amplifier integrated circuit B Design Considerations for Class D Audio Power Amplifiers TI Literature Number SLOA031 This application report provides detailed information on designing audio power amplifier systems using TI class D amp
18. D EVM Stand Alone Using the TPA005D12 class D stereo audio power amplifier evaluation module stand alone is much the same as using it with the platform The same 4 5 V to 5 5 V power supply range and the isolated out and out lines for BTL operation Section 3 2 3 requirements exist Figure 3 10 shows the connections that are required for operation with the exception of the fault monitor circuit which is optional The discussion in this section is in reference to this figure unless otherwise noted Figure 3 10 TPA005D12 Class D EVM Stand Alone Connections for Stereo BTL Output LED 1 R SP i Audio Inputs Right Audio Inputs Left Fault Monitor Bop PS P ED 0 Right d 6661 OldL Left 3 5 1 Power Connections 3 18 Power must be connected to both the VDD and VDD2 module pins Power supply ground can be connected to any module ground pin although best results are achieved if power supply grounds are connected to the pins adjacent to the VDD and VDD2 module pins The ground and power wires should be twisted to reduce inductance and noise pickup if they are long Details Using The TPA005D12 Class D EVM Stand Alone 3 5 2 Input Connections The class D a
19. PCB Layers The following illustrations depict the TPA005D12 class D EVM PCB assembly and layers These drawings are notto scale Gerber plots can be obtained from any TI Sales Office Figure 3 19 TPA005D12 Class D EVM Top Assembly TPA 5D12 EVM Board VDD2 GND N o 2 o 7 12 Texas Instruments 1999 VDD GND C25 C220 C2 oo oo 3 o Details 3 27 TPA005D12 Class D EVM PCB Layers Figure 3 21 TPA005D12 Class D EVM Top Layer Li L o e go 0000000 e 3 28 Details TPA005D12 Class D EVM PCB Layers Figure 3 23 TPA005D12 Class D EVM Third Layer Details 3 29 3 30 Details
20. Quick Start List for 2 5 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 3ounos ela noon er od OV AlddAS D m Signal Conditioning iu Zn R1 zan ino p mo ju 8 Speaker Output uO OOOOO OO CAUTION Do not insert or remov EVM boards with powfr applied O Headphone Output SVXal Plug N Play Audio Amp Evaluation Platform SLOP097 Rev C 1 SLNAWNYLSNI Quick Start 2 2 Quick Start List for Platform 2 2 Quick Start List for Platform Follow these steps when us
21. 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 8 Mute Mode and Polarity Control 3 14 VDD Polarity JP8 JP6 Um Lo Mode ji U2 4 Headphone i dis age 11 Hi Mute A R4 R5 SPK 1 ko 1kQ 02 04 Details Using The TPA005D12 Class D EVM With the Plug N Play Platform 3 4 4 2 Mute Mode Select JP6 A 3 pin jumper header JP6 on the platform functioning as an 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 B Set jumper JP6 to MODE when a separate headphone amplifier is NOT installed in U5 B Set jumper JP6 to MUTE when a separate headphone amplifier IS installed in U5 This will cause the TPA005D12 class D EVM to shut down when a plug is inserted into platform headphone jack J10 3 4 4 8 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 Set jumper JP8 to Lo for normal class D operation when a separate headphone amplifier 15 installed in U5 Details 3 15 Power Requirements 3 4 5 Power Requirem
22. dB Total harmonic distortion noise Po 2 1 W 1 2 0 1 Introduction Chapter 2 Quick Start Follow the steps in this chapter to quickly prepare the TPA005D12 class D stereo audio amplifier EVM for use Using the TPA005D12 class D 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 it can be wired directly into existing circuits or equipment The platform switch and jumper settings shown in Table 2 1 are typical for the TPA005D12 class D EVM There are no jumpers or switches to set the TPA005D12 class D EVM board itself Table 2 1 Typical TI Plug N Play Platform Jumper and Switch Settings for the 005012 Class D EVM POWER TYPE Noea se sr Pe si S2 Woe ss VDD J6 Notes 1 ON Jumper installed OFF Jumper NOT Installed X Don t care 2 Unregulated and battery sources must have a voltage regulator EVM SLVP097 installed in platform socket U6 see table 3 4 Section 3 5 5 for these options 3 Set to ON when tone control board SLOP109 is installed in U1 Topic Page 2 1 Precautions 222222272220 550650021 2 2 2 2 Quick Start List for Platform 2 3 2 3
23. ents The TPA005D12 class D stereo audio power amplifier evaluation module is designed to operate from a supply voltage between 4 5 V and 5 5 V For best performance highest output power with lowest distortion the module should be operated at 5 V The TI plug n play audio amplifier evaluation platform provides several options for powering the TPA005D12 class D EVM Table 3 3 shows the platform jumper and switch settings for each power source option see the User s Guide for the TI plug n play audio amplifier platform Literature Number SLOUO11 for more information The TPA005D12 class D EVM requires no setup for power source selection Table 3 3 Platform Jumper and Switch Settings for the TPA005D12 EVM Power Inputs POWER TYPE Note 2 JP2 veo VDD J OF Notes 1 ON Jumper installed OFF Jumper NOT Installed X Don t care 2 Unregulated and battery sources must have a voltage regulator EVM SLVP097 installed in platform socket U6 3 Set to ON when Tone Control Board SLOP109 is installed in U1 otherwise set to OFF J1 81 6 Although the TPA005D12 amplifier IC draws approximately 0 7 A per channel from the power supply during continuous full power output peak current draw can be as high as 1 15 A per channel Any power supply connected to the platform should be capable of providing 2 3 A to avoid clipping of the output signal during voltage peaks Current consumption driving speakers at normal listening
24. es 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 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 4 1 1 EVM Insertion 1 Remove all power from the evaluation platform 2 Locate sockets U2 and U3 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 Checkto be sure that all pins are seated properly and that none are bent Over 3 4 1 2 EVM Removal 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 3 11 Using The TPA005D12 Class D EVM With the Plug N Play Platform 3 4 2 Module Switches The 005012 class D stereo audio amplifier evaluation module is equipped with two pushb
25. gions rather than the linear region which is where class AB amplifiers operate This reduces switching and conduction losses reducing the power dissipated by the power transistors and allowing more power to be delivered to the load An inductor capacitor LC low pass filter LPF then removes the high frequency switching component from Vourn leaving an amplified version of the original input signal Examples of these waveforms are shown in Figure 3 6 Details The TPA005D12 Class D Audio Power Amplifier Evaluation Module Figure 3 6 Class D Input and Output Waveforms VIN VRAMP VOUT 0v The signal must be at a much higher frequency than the highest frequency component of VIN to obtain an accurate representation at the low pass filter output and allow greater attenuation of the switching component of Vout The TPA005D12 class D EVM uses 250 kHz VRAMP signal to sample Vij This frequency is more than ten times higher than the highest frequency component of the 20 Hz to 20 kHz range of the audio input providing excellent output resolution and easy filtering by the LPF 3 2 3 Bridge Tied Load BTL Operation The DMOS output transistors of the TPA005D12 class D amplifier IC are arranged in an H bridge configuration to allow BTL operation In the BTL output mode each half of the H bridge operates 180 out of phase from the other The load in this case a speaker is then connected betwee
26. gram VDD 100k 100k 45V TPA005D12 lt TP2 Mute llSHUTDOWN cosc 48 as 47 AGND Sl AGND AGND 470pF LIN e 4 LINN 45 C2MgF 5 a pF CA gt RINP G7 RIN 470pF e comp 3 p C13 C9 C10 7 AGND 0 S 11 c12 C14 10uF 1uF 3 voo FAULT_1 TP3 Tour VDD LPVDD RPVDD 552 LOUT Em LOUTP ROUTP ROUT C20 L1 L2 C23 1 5uH LOUTP ROUTP 1 5uH C24 0 22uF E PGND PGND Pp 0 22uF C25 1uF C21 3 panD PGND 28 141 c22 0 224F 15uH LOUTN ROVIN 15uH 0 22uF LOUT E LOUTN ROUTN T E ROUT LPVDD 33 7 NC Nc 32 NC ne 9 Nc Nc 30 20 29 V2P5 21 PVDD C16 C15 PGND F iuF CP4 i CP1 C18 0 047uF C19 0 047uF 3 2 1 TPA005D12 Class D Stereo Audio Amplifier IC The TPA005D12 class D stereo audio power amplifier integrated circuit converts low level audio into pulse width modulated PWM signals which result in an audio output with 20 dB increase in amplitude The IC features high current DMOS output transistors and internal feedback that provides excellent performance without the need for external components beyond input isolation and output filtering A full range of protection features are built into the TPA005D12 amplifier IC to increase device reliability thermal overcurrent and undervoltage shutdown with status terminals that
27. he fault indicator circuit can be monitored by attaching a pullup resistor to the open drain outputs of FAULTO TP2 and FAULT1 TP3 The voltage should not exceed 5 V and the current must be limited to less than 1 mA A fault table is shown in Section 3 2 5 and the device data sheet Details 3 19 TPA005D12 Class D EVM Performance Characteristics 3 6 TPA005D12 Class D EVM Performance Characteristics The TPA005D12 class D stereo audio power amplifier EVM was tested using an Audio Precision System II model 2322 a 5 V regulated dc power supply and the TI PNP audio power amplifier evaluation platform set up as described in Chapter 2 Results were obtained with 4 Q and 8 Q speaker loads The results are shown in Figures 3 11 through 3 17 The frequency response shown in Figure 3 17 is a relatively flat 20 dB over the 20 Hz to 100 kHz frequency range The lower and upper frequency corners can be adjusted to extend the frequency response Figure 3 11 Class D Amplifier Frequency Response at 4 3 20 VOLTAGE AMPLIFICATION vs FREQUENCY 22 5 20 17 5 15 12 5 10 7 5 Voltage Amplification dB 2 5 NAI You 2 5 TA 10 100 1k 10k 100k f Frequency Hz Total harmonic distortion plus noise THD N versus output power and frequency is shown in Figures 3 12 through 3 15 be
28. ing the TPA005D12 class D EVM with the plug n play audio amplifier evaluation platform see the platform user s guide 5100011 for additional details Numbered callouts for selected steps are shown in Figure 2 1 and details appear in Chapter 3 Platform Preparations 1 Ensure that all external power sources are set to OFF 2 Install a TPA005D12 module in platform socket U2 taking care to align the module pins correctly EVM power pins engage sockets U2 and U3 Set switch S2 to OFF Set switch S3 to U5 3 Set jumper JP6 to select the Mute control input A 5 6 Table 2 2 Platform Jumper and Switch Settings for the TPA005D12 POWER TYPE Noea se ws sr se emea 5 Set control signal Polarity jumper JP8 to Lo VDD 26 Notes 1 ON Jumper installed OFF Jumper NOT Installed X Don t care 2 Unregulated and battery sources must have a voltage regulator EVM SLVP097 installed in platform socket U6 3 Set to ON when tone control board SLOP109 is installed in U1 Power supply 7 Connect a 5 V regulated power supply ensure power supply is set to OFF to J6 taking care to observe marked polarity 8 Set jumper JP5 for VDD power to EVMs Inputs and outputs 9 Ensure that the audio signal source level is set to minimum 10 Connect the audio source to left and right RCA phono jacks J3 and J5 or stereo miniature phone jack J4 11 Connect 4 Q 8 0 speakers to left
29. levels is typically 0 1 A or less A Vpp supply of 5 V is required if a signal processing EVM is installed in platform socket U1 or a separate headphone amplifier EVM is installed in U5 Vpp can either be applied to the platform Vpp power input terminals J6 or a voltage regulator SLVP097 or equiv can be installed in platform socket U6 to provide Vpp from the platform Vcc supply The platform is equipped with overvoltage and reverse polarity supply voltage input protection in the form of fused crowbar circuits Vpp voltage applied to platform screw terminals J6 MUST NOT exceed the absolute maximum rating for the TPA005D12 amplifier IC installed on the evaluation module 5 5 V or damage to the IC may result In no case should Vpp voltage ofthe incorrect polarity or in excess of 6 0 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 bus will trip 3 16 Details Inputs Outputs 3 4 6 Inputs and Outputs 3 4 6 1 Inputs 3 4 6 2 Outputs The TI plug n play audio amplifier evaluation platform is equipped with several standard conec
30. lifier ICs B Reducing and Eliminating the Class D Output Filter TI Literature Number SLOAO023 This application report covers output filter theory and design for class D audio power amplifiers 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 Tl is a trademark of Texas Instruments Incorporated PowerPAD is a trademark of Texas Instruments Incorporated Contents uL 1 1 1 1 Feature Highlights i22 tera nares ee rp tea ucb gei ba Re PORA UTERE RE ERE 1 2 1 2 Description iiie esee eee Daa de aede Rede EUR eddie nod eddie 1 3 1 3 TPA005D12 Class D EVM Specifications 1 4 leds PR 2 1 2 1 a REX IG a UA VER x Ee p 2 2 2 2 Quick Start List for Platform 2 3 2 3 Quick Start List for Stand Alone 2 4
31. low Figures 3 12 and 3 13 show power sweeps at a fixed frequency of 1 kHz Switching and input noise begins to dominate at low power while the distortion at the mid to upper power levels is a function of the class D amplifier and the inductor The lower frequency noise may be improved by either increasing the order of the filter or by increasing the amplifier switching frequency which will further attenuate the switching noise in the audio band Midrange distortion is a combination of the switching noise of the output power transistors in the IC and the magnetic field created by the inductors This distortion is minimized by good separation of the output filter inductors for each channel and through good EMI reduction layout techniques Details TPA005D12 Class D EVM Performance Characteristics Figure 3 12 Class D Amplifier Distortion versus Output Power at 4 TOTAL HARMONIC DISTORTION PLUS NOISE vs OUTPUT POWER 1 I 5V 9 RL 4 3 25 o 3 n 5 1 kHz E a 2 0 1 x 5 2 a 0 02 0 01 0 1 1 2 Output Power W Figure 3 13 Class D Amplifier Distortion versus Output Power at 8 TOTAL HARMONIC DISTORTION PLUS NOISE vs OUTPUT POWER gt THD N Total Harmonic Distortion Plus Noise
32. mplifier input signals can be connected in either of two ways differential or single ended For differential operation connect the two lines from the signal source to the positive and negative inputs of each channel RIN RIN and LIN LIN module pins For single ended operation the input signal lines should be connected to the RIN and LIN module pins and the signal source ground wires should be connected to the RIN and LIN module pins For best results the ground of the signal source should be connected to the GND pins at the EVM inputs to provide a return path for the current The input signal and ground wires should be twisted to reduce inductance and noise pickup if the lead lengths are long and the cable is not shielded 3 5 3 Output Connections The right speaker should be connected between the Rout and the Rout module pins and the left speaker should be connected between the Lout and the Lout module pins to comply with the isolated output requirements for BTL operation 3 5 4 Controls and Indicators The mute and shutdown functions may be controlled externally via the module mute and SD pins An active low input mutes the selected amplifier or shuts down the device A signal of 2 V or higher or a float condition allows normal operation Note that the mute and shutdown signals applied to the EVM control input pins must be able to supply enough current to overcome the pullup resistor on the module 100 T
33. n the two halves and is not connected directly to ground The load is in a sense floating BTL operation has two main advantages over single ended operation First it eliminates the need for a bulky output coupling capacitor to block any dc offset voltage that may be present which reduces the speaker response and may damage the speaker And second it quadruples the output power that can be delivered to the load For more information see the TPA005D12 amplifier IC data sheet TI Literature Number SLOS240 To operate in the BTL output mode the EVM output signal from Rout Lout must go through the speaker load be returned directly to Rout Lout and NOTto system ground This requires that the Rout Lout lines be isolated not only from system ground but also from each other and the out lines of any other amplifiers in the system The plug n play platform provides such isolated output lines connecting the EVM output pins directly to left and right speaker connectors Details 3 7 The TPA005D12 Class D Audio Power Amplifier Evaluation Module 3 2 4 Class D Differential Inputs The TPA005D12 EVM line inputs allow the use of a single ended or differential audio source The differential input stage of the amplifier cancels any noise thatappears on both input lines of a channel To use the EVM with a differential source connect the positive lead of the audio source to the RIN LIN inputs and the negative lead to the RIN LIN in
34. nel circuits Power from J1 J2 J6 or B1 3 7 12 13 20 GND Analog and power ground for EVM GND Ground for platform from J1 J2 27 36 37 46 all pins J6 or B1 47 Class D right channel positive input Right In line Right channel input from J3 or J4 45 RIN Class D right channel inverted input GND Ground for platform from J1 J2 J6 or B1 38 39 Class D right channel positive out Right Out Right channel positive output to J7 put or J8 34 35 Rout Class D right channel inverted out Right Out Right channel negative output to put J7 or J8 Class D left channel positive input Left In line Left channel input from J4 or J5 4 LIN Class D left channel inverted input GND Ground for platform from J1 J2 J6 or B1 10 11 Class D left channel positive output Left Out Left channel positive output to J8 or J9 14 15 Class D left channel inverted output Left Out Left channel negative output to J8 or J9 Mute Mute control external input pin ac N C No connect tive low selected amplifier active when held 2 V SD Shutdown control external input pin Mute Mute control from JP6 for use active low normal operation when when testing a headphone amplifi held 22V er in socket U5 in conjunction with an EVM in 02 03 04 TP4 Fault 1 Logic level fault 1 output N C No connect signal MSB Open drain P3 C 42 T Fault 0 Logic level fault 0 output N No connect signal LSB Open drain 3 24 Details TPA005D12
35. o the ground of the audio signal source Connect a control signal to the module Mute pin if necessary The control signal should be high 2 V to 5 V or left floating for normal operation or low tied to ground to mute the output Connect a control signal to the module SD pin if necessary The control signal should be high 2 V to 5 V or left floating for normal operation or low tied to ground to shut down the TPA005D12 amplifier IC on the EVM Note that the control signals applied to the EVM mute and SD inputs must have sufficient current capability to overcome the 100 kQ pullup resistor on each input Miniature pushbutton switches on the EVM allow manual shutdown S2 and manual muting S1 of the amplifier 7 Connect 4 Q 8 Q speaker to the module Rout Rout pins and another speaker to the Lout Lout pins taking care to observe marked polarity 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 Quick Start Chapter 3 Details This chapter provides details on the TPA005D12 IC the evaluation module and the steps in the Quick Start list a discussion of class D amplifiers additional application information a parts list for the TPA005D12 class D evaluation module module performance graphs and module PCB layer illustrations Topic Page Precautionsq 3 2
36. oard These pins allow the module to be plugged into the 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 top side and Figure 3 3 bottom side and its schematic is shown in Figure 3 4 Note that several components are mounted on the bottom side of the EVM PCB Details 3 3 The TPA005D12 Class D Audio Power Amplifier Evaluation Module Figure 3 2 The TI TPA005D12 Class D Stereo Audio Power Amplifier EVM Top View Ke o Texas Instruments 1999 TP10 79 4 U VDD2 GND VDD GND SLOP246 005012 EVM Board 3 4 Details The TPA005D12 Class D Audio Power Amplifier Evaluation Module Figure 3 4 TPA005D12 Class D EVM Schematic Dia
37. puts To use the EVM with single ended source connect the positive lead of the audio source to the RIN LIN inputs and the ground lead to the RIN LIN inputs This ac grounds the input capacitors on the negative terminals and balances the input impedance of the class D amplifier s positive and negative input terminals preventing voltage differences that result in popping in the speakers 3 2 5 Control and Indicator Circuits Three main control circuits are provided with the TPA005D12 The mute circuit grounds the output of the active amplifier and the shutdown circuit places the entire device into a power saving sleep mode to minimize current consumption Each of these inputs is TTL compatible less than 0 8 V applied to these pins is considered a logic low and any voltage greater than 2 V is considered a logic high Two indicator pins are also provided for feedback when an under voltage over current or thermal fault exists Module pins are provided for easy connection of off board control and monitoring There are two active low fault indicator pins on the TPA005D12 amplifier IC IC pins 40 and 41 that provide feedback when a fault condition exists Signals on these pins provide the status of the class D amplifier operational over current thermal fault and under voltage lockout Table 3 1 lists the possible output conditions of these pins and a description of the fault indicated Table 3 1 TPA005D12 Class D EVM Fault Indicator
38. report any error conditions encountered The device is provided in a very small 48 pin thermally enhanced PowerPAD TSSOP surface mount package DCA and consumes only 1 in the shutdown mode making the TPA005D12 an excellent choice for portable battery powered applications Details 3 5 The TPA005D12 Class D Audio Power Amplifier Evaluation Module 3 2 2 Overview of Class D Audio Amplifiers Class D audio amplifiers are very similar in operation to switch mode power supplies in that both compare an input signal with a reference to create an error voltage that controls a pulse width modulator PWM circuit The PWM circuit then produces an output signal at constant frequency and with a duty cycle that varies according to the input signal A block diagram of the major components that make up the amplifier is shown in Figure 3 5 Figure 3 5 Class D Functional Diagram Source Ramp Generator 3 6 The audio input signal is applied to a very fast comparator along with a ramp signal VRamp created by the ramp generator Each time the triangle wave from the ramp generator crosses the audio input signal level the comparator sends an error signal VERROR to the PWM control circuit The PWM control signal VcoNTROL then regulates the duty cycle of the high current DMOS power transistors of the H bridge providing the output signal These transistors operate in either the cutoff or saturated re
39. s room for a single TPA005D12 class D evaluation module and is a convenient vehicle for demonstrating Tl s audio power amplifier and related evaluation modules The EVM simply plugs into the platform which automatically 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 speakers included with the platform to hook up 1 3 TPA005D12 Class D EVM Specifications 1 3 1 All measurements made with Vpp 5 V and Ry 4 O unless otherwise noted Maximum Supply voltage range 4 5 V to 5 5 V Supply iE 23A Continuous output power per channel BTL 2W Audio input voltage V 280 mVrms 1 3 2 Typical Supply current no input 35 mA Supply current EVM mute DD 2 5 mA Supply current EVM shutdown IDD 50 uA Cra T M TBT 20 dB Crosstalk Pos 2 WQ TKHZ sal 60
40. tors 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 TPA005D12 class D power amplifier EVM to operate in the highly efficient bridge tied load configuration when driving speakers 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 9 Figure 3 9 Typical Headphone Plug Left Right GND Details 3 17 Using The TPA005D12 Class D EVM Stand Alone 3 5 Using The TPA005D12 Class
41. ure stereo headphone jack output Introduction Description 1 2 Description The TPA005D12 class D stereo audio power amplifier evaluation module is complete 2 Watt per channel stereo audio power amplifier It consists of the TI TPA005D12 class D stereo audio power amplifier IC along with a small number of other parts mounted on a circuit board that measures approximately 2 inches by 2 1 4 inches Figure 1 1 and 1 2 Figure 1 1 The TI TPA005D12 Class D Stereo Audio Power Amplifier EVM Top View o Instruments 1999 TP10 VDD GND amp rTPe O SLOP246 005012 EVM Board Introduction 1 3 TPA005D12 Class D EVM Specifications Single in line header pins extend from the underside of the module circuit board to allow the EVM to either 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 ha
42. ut conneatons Details 3 9 Class D Amplifier Design Considerations 3 3 Class D Amplifier Design Considerations 3 10 Detailed information for proper design and implementation of TI class D audio power amplifiers appears in the application report Design Considerations for Class D Audio Power Amplifiers Literature Number SLOAO031 on the website http www ti com sc apa This document provides background information general equations and component selection criteria for the topics listed below General layout considerations are also included in the report Class D amplifier circuits input output charge pump and switching Control and indicator circuits Power supply decoupling The application report Reducing and Eliminating the Class D Output Filter SLOA023 is also available from the website and provides information to help determine what type of output filter if any may be necessary Details Using The TPA005D12 Class D EVM With the Plug N Play Platform 3 4 Using The TPA005D12 Class D EVM With the Plug N Play Platform The 005012 class D stereo audio amplifier evaluation module was designed to be used with the TI plug n play audio amplifier evaluation platform It simply plugs into socket U2 and U3 The following paragraphs provide additional details for using the TPA005D12 class D EVM with the platform 3 4 4 Installing and Removing EVM Boards TI plug n play evaluation modul
43. utton switches that allow the module shutdown and mute functions to be manually activated 3 4 2 1 S1 Shutdown To have the module amplifier 1 enter the shutdown mode press the Shutdown switch S2 on the module S2 connects the amplifier IC SHUTDOWN pin to ground forcing it into a low power state This function can be controlled by an external control input to the SD module pin The shutdown mode reduces the amplifier IC current consumption to approximately 1 uA compared to approximately 2 5 mA in the mute mode The EVM shutdown current is based on Vpp R2 and capacitor leakage currents but will typically be 50 uA 5 for Vpp 5 V The plug n play platform typically draws 23 mA of current 3 4 2 2 S2 Mute Switch 3 12 Pushbutton switch 51 on the TPA005D12 class D EVM allows manual muting of the amplifier IC 1 connects the amplifier IC MUTE pin to ground muting the output The EVM Mute control input pin also allows external control of this function In the mute mode the amplifier IC lowside output transistors are turned on shorting the load to ground This reduces the EVM current to 2 5 mA Details Using The TPA005D12 Class D EVM With the Plug N Play Platform 3 4 3 Signal Routing Signal flow on the platform is controlled by two signal routing switches as shown in Figure 3 7 Figure 3 7 Platform Signal Routing and Outputs Off e z R 2
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