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Texas Instruments TPA005D12 manual

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Table of contents for the manual

  • Page 1

    August 1999 Mixed-Signal Products User ’ s Guide SLOU051A[...]

  • Page 2

    IMPORT ANT NOTICE T exas Instruments and its subsidiaries (TI) 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 product[...]

  • Page 3

    iii Chapter Title—Attribute Reference Preface Related Documentation From T exas Instruments TI Plug-N-Play Audio Amplifier Evaluation Platform (TI Literature Number SLOU01 1) provides detailed information on the evaluation platform and its use with TI audio evaluation modules. TP A005D12 CLASS-D STEREO AUDIO POWER AMPLIFIER (TI Literature Number [...]

  • Page 4

    iv[...]

  • Page 5

    Running Title—Attribute Reference v Chapter Title—Attribute Reference Contents 1 Introduction 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Feature Highlights 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .[...]

  • Page 6

    Running Title—Attribute Reference vi Figures 1–1 The TI TP A005D12 Class-D Stereo Audio Power Amplifier EVM — T op V iew 1-3 . . . . . . . . . 1–2 The TI TP A005D12 Class-D Stereo Audio Power Amplifier EVM — Bottom View 1-3 . . . . . . 2–1 Quick Start Platform Map 2-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .[...]

  • Page 7

    1-1 Introduction Introduction This chapter provides an overview of the T exas Instruments (TI  ) TP A005D12 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. T opic Page 1.1 Feature Highlig[...]

  • Page 8

    Feature Highlights 1-2 Introduction 1.1 Feature Highlights The TI TP A005D12 class-D stereo audio power amplifier evaluation module and the TI plug-n-play audio amplifier evaluation platform include the following features: TP A005D12 Class-D Stereo Audio Power Amplifier Evaluation Module Internal depop circuitry to greatly reduce turn-on transients[...]

  • Page 9

    Description 1-3 Introduction 1.2 Description The TP A005D12 class-D stereo audio power amplifier evaluation module is a complete, 2-W att per channel stereo audio power amplifier . It consists of the TI TP A005D12 class-D stereo audio power amplifier IC along with a small number of other parts mounted on a circuit board that measures approximately [...]

  • Page 10

    TP A005D12 Class-D EVM Specifications 1-4 Introduction 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 has room for a sin[...]

  • Page 11

    2-1 Quick Start Quick Start Follow the steps in this chapter to quickly prepare the TP A005D12 class-D stereo audio amplifier EVM for use. Using the TP A005D12 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 con[...]

  • Page 12

    Precautions 2-2 Quick Start 2.1 Precautions Power Supply Input Polarity and Maximum V oltage Always ensure that the polarity and voltage of the external power connected to V CC power input connector J1, J2, and/or V DD power input connector J6 are correct. Overvoltage or reverse-polarity power applied to these terminals can open onboard soldered-in[...]

  • Page 13

    Quick Start List for Platform 2-3 Quick Start 2.2 Quick Start List for Platform Follow these steps when using the TP A005D12 class-D EVM with the TI plug-n-play audio amplifier evaluation platform (see the platform user ’ s guide, SLOU01 1, for additional details). Numbered callouts for selected steps are shown in Figure 2–1 and details appear [...]

  • Page 14

    Quick Start List for Stand-Alone 2-4 Quick Start 2.3 Quick Start List for Stand-Alone Follow these steps to use the TP A005D12 class-D EVM stand-alone or to connect it into existing circuits or equipment. Connections to the TP A005D12 module header pins can be made via individual sockets, wire-wrapping, or soldering to the pins, either on the top o[...]

  • Page 15

    3-1 Details Details This chapter provides details on the TP A005D12 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 TP A005D12 class-D evaluation module, module performance graphs, and module PCB layer illustrations. T opic Page 3.1 Precau[...]

  • Page 16

    Precautions 3-2 Details 3.1 Precautions Power Supply Input Polarity and Maximum V oltage Always ensure that the polarity and voltage of the external power connected to V CC power input connector J1, J2, and/or V DD power input connector J6 are correct. Overvoltage or reverse-polarity power applied to these terminals can open onboard soldered-in fus[...]

  • Page 17

    The TP A005D12 Class-D Audio Power Amplifier Evaluation Module 3-3 Details 3.2 The TP A005D12 Class-D Audio Power Amplifier Evaluation Module The TP A005D12 class-D stereo audio power amplifier evaluation module is powered by a TP A005D12 class-D stereo power amplifier integrated circuit. The EVM is capable of delivering greater than 2 W of continu[...]

  • Page 18

    The TP A005D12 Class-D Audio Power Amplifier Evaluation Module 3-4 Details Figure 3–2. The TI TP A005D12 Class-D Stereo Audio Power Amplifier EVM — T op View T exas 1999 U1 +RIN– TP1 C5 Rout+ R2 R1 SD Mute Rout– Lout+ Lout– GND VDD SLOP246 TP A005D12 EVM Board GND VDD2 Instruments GND –LIN+GND S1 Mute S2 SD C1 C4 C3 C2 C18 L4 L3 L2 L1 T[...]

  • Page 19

    The TP A005D12 Class-D Audio Power Amplifier Evaluation Module 3-5 Details Figure 3–4. TP A005D12 Class-D EVM Schematic Diagram TP A005D12 S2 SD R2 100k SD R1 100k S1 Mute Mute VDD C3 LOUTP 11 PGND 12 PGND 13 LOUTN 14 LOUTN 15 LPVDD 16 NC 17 NC 18 LOUTP 10 LPVDD 9 VDD 8 AGND 7 LCOMP 6 LINP 5 LINN 4 NC 19 AGND 20 PVDD 21 VCP 22 CP3 23 CP2 24 AGND [...]

  • Page 20

    The TP A005D12 Class-D Audio Power Amplifier Evaluation Module 3-6 Details 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 circu[...]

  • Page 21

    The TP A005D12 Class-D Audio Power Amplifier Evaluation Module 3-7 Details Figure 3–6. Class-D Input and Output Waveforms V DD 0 V V RAMP V IN V OUT The V RAMP signal must be at a much higher frequency than the highest frequency component of V IN to obtain an accurate representation at the low-pass filter output and allow greater attenuation of t[...]

  • Page 22

    The TP A005D12 Class-D Audio Power Amplifier Evaluation Module 3-8 Details 3.2.4 Class-D Differential Inputs The TP A005D12 EVM line inputs allow the use of a single-ended or differential audio source. The differential input stage of the amplifier cancels any noise that appears on both input lines of a channel. T o use the EVM with a dif ferential [...]

  • Page 23

    The TP A005D12 Class-D Audio Power Amplifier Evaluation Module 3-9 Details 3.2.6 TP A005D12 Class-D EVM T est Points T est points have been included on the TP A005D12 class-D EVM to facilitate user analysis of device performance and design adjustments. T able 3–2 lists each test point and its corresponding function. T able 3–2. TP A005D12 Class[...]

  • Page 24

    Class-D Amplifier Design Considerations 3-10 Details 3.3 Class-D Amplifier Design Considerations 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 , TI Literature Number SLOA031, on the TI website (http://www .ti.c[...]

  • Page 25

    Using The TP A005D12 Class-D EVM With the Plug-N-Play Platform 3-1 1 Details 3.4 Using The TP A005D12 Class-D EVM With the Plug-N-Play Platform The TP A005D12 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 para[...]

  • Page 26

    Using The TP A005D12 Class-D EVM With the Plug-N-Play Platform 3-12 Details 3.4.2 Module Switches The TP A005D12 class-D stereo audio amplifier evaluation module is equipped with two pushbutton switches that allow the module shutdown and mute functions to be manually activated. 3.4.2.1 S1 — Shutdown T o have the module amplifier IC enter the shut[...]

  • Page 27

    Using The TP A005D12 Class-D EVM With the Plug-N-Play Platform 3-13 Details 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 U1 Signal Conditioning On Off U5 Stereo Headphone Amplifier S2 R L R L L U5 U2 – U4 S3 J10 Headphon[...]

  • Page 28

    Using The TP A005D12 Class-D EVM With the Plug-N-Play Platform 3-14 Details 3.4.4 Shutdown The TP A005D12 class-D EVM is equipped with a shutdown control input pin. When this input is tied to GND, the TP A005D12 amplifier IC on the module enters the shutdown mode and dissipates very little power . When the EVM control input is tied to V DD or allow[...]

  • Page 29

    Using The TP A005D12 Class-D EVM With the Plug-N-Play Platform 3-15 Details 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. Set jumper JP6 to MODE w[...]

  • Page 30

    Power Requirements 3-16 Details 3.4.5 Power Requirements The TP A005D12 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[...]

  • Page 31

    Inputs and Outputs 3-17 Details 3.4.6 Inputs and Outputs The TI plug-n-play audio amplifier evaluation platform is equipped with several standard conectors for audio inputs and outputs. 3.4.6.1 Inputs 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)[...]

  • Page 32

    Using The TP A005D12 Class-D EVM Stand-Alone 3-18 Details 3.5 Using The TP A005D12 Class-D EVM Stand-Alone Using the TP A005D12 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 (Sectio[...]

  • Page 33

    Using The TP A005D12 Class-D EVM Stand-Alone 3-19 Details 3.5.2 Input Connections The class-D amplifier input signals can be connected in either of two ways: differential or single-ended. For dif ferential operation, connect the two lines from the signal source to the positive and negative inputs of each channel (RIN+/RIN– and LIN+/LIN– module [...]

  • Page 34

    TP A005D12 Class-D EVM Performance Characteristics 3-20 Details 3.6 TP A005D12 Class-D EVM Performance Characteristics The TP A005D12 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 Ch[...]

  • Page 35

    TP A005D12 Class-D EVM Performance Characteristics 3-21 Details Figure 3–12. Class-D Amplifier Distortion versus Output Power at 4 Ω 1 THD+N – T otal Harmonic Distortion Plus Noise – (%) TOT AL HARMONIC DISTORTION PLUS NOISE vs OUTPUT POWER 0.1 P O – Output Power – W 0.02 1 kHz V DD = 5 V R L = 4 Ω T A = 25 ° C 0.01 1 2 0.1 Figure 3?[...]

  • Page 36

    TP A005D12 Class-D EVM Performance Characteristics 3-22 Details 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 Distort[...]

  • Page 37

    TP A005D12 Class-D EVM Performance Characteristics 3-23 Details EVM crosstalk is shown in Figures 3–16 and 3–17. The frequency is swept from 20 Hz to 20 kHz for 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. Cla[...]

  • Page 38

    TP A005D12 Class-D EVM Interconnects 3-24 Details 3.7 TP A005D12 Class-D EVM Interconnects T able 3–4 shows the correlation between the TP A005D12 class-D amplifier IC pins, the EVM pins, and the plug-n-play (PNP) platform sockets. T able 3–4. TP A005D12 Class-D EVM/Plug-N-Play Platform Interconnects CLASS-D EVM PLUG-N-PLA Y PLA TFORM IC PIN EV[...]

  • Page 39

    TP A005D12 Class-D EVM Bill of Materials 3-25 Details 3.8 TP A005D12 Class-D EVM Bill of Materials The components in the bill of materials (T able 3–5) were selected for their common values, availability , and the smallest size available to meet these criteria. T able 3–5. TP A005D12 Class-D EVM Bill of Materials Reference Description Size EVM [...]

  • Page 40

    TP A005D12 Class-D EVM Schematic 3-26 Details 3.9 TP A005D12 Class-D EVM Schematic The following schematic depicts the TP A005D12 class-D EVM. Note: C13 and C14 are optional and have been provided to allow flexibility of design. Figure 3–18. TP A005D12 Class-D EVM Schematic Diagram TP A005D12 S2 SD R2 100k SD R1 100k S1 Mute Mute VDD C3 LOUTP 11 [...]

  • Page 41

    TP A005D12 Class-D EVM PCB Layers 3-27 Details 3.10 TP A005D12 Class-D EVM PCB Layers The following illustrations depict the TP A005D12 class-D EVM PCB assembly and layers. These drawings are not to scale. Gerber plots can be obtained from any TI Sales Office. Figure 3–19. TP A005D12 Class-D EVM T op Assembly Figure 3–20. TP A005D12 Class-D EVM[...]

  • Page 42

    TP A005D12 Class-D EVM PCB Layers 3-28 Details Figure 3–21. TP A005D12 Class-D EVM T op Layer Figure 3–22. TP A005D12 Class-D EVM Second Layer[...]

  • Page 43

    TP A005D12 Class-D EVM PCB Layers 3-29 Details Figure 3–23. TP A005D12 Class-D EVM Third Layer Figure 3–24. TP A005D12 Class-D EVM Bottom Layer[...]

  • Page 44

    3-30 Details[...]