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Texas Instruments TPA0242 manual

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Table of contents for the manual

  • Page 1

    March 2000 Mixed-Signal Products User ’ s Guide SLOU074[...]

  • 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 (literature number SLOU01 1) provides detailed information on the evaluation platform and its use with TI audio evaluation modules. TP A0242 Stereo 2-W Audio Power Amplifier (literature number SLOS287) Thi[...]

  • 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 A0242 Audio Amplifier Evaluation Module 1-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1 Quick Start Platform Map 2-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2 Module Preparation 2-4 . . . . .[...]

  • Page 7

    1-1 Introduction Introduction This chapter provides an overview of the T exas Instruments (TI  ) TP A0242 audio amplifier evaluation module (SLOP275). 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 Highlights 1–2 . . . . . . .[...]

  • Page 8

    Feature Highlights 1-2 Introduction 1.1 Feature Highlights The TI TP A0242 audio amplifier evaluation module and the TI plug-n-play audio amplifier evaluation platform include the following features: TP A0242 stereo 2-W audio power amplifier evaluation module Internal depop circuitry to minimize transients in outputs Dual channel, bridge-tied load [...]

  • Page 9

    Description 1-3 Introduction 1.2 Description The TP A0242 stereo 2-W audio power amplifier evaluation module is a complete, 2-watt per channel stereo audio power amplifier . It consists of the TI TP A0242 stereo 2-W audio power amplifier IC along with a small number of other parts mounted on a circuit board that measures approximately 2 1/4 inches [...]

  • Page 10

    1-4 Introduction[...]

  • Page 11

    2-1 Quick Start Quick Start The steps in this chapter can be followed to quickly prepare the TP A0242 audio amplifier EVM for use. Using the TP A0242 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[...]

  • 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 A0242 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 Figure 2–2, and details[...]

  • Page 14

    Quick Start List for Platform 2-4 Quick Start Evaluation module preparations Figure 2–2. Module Preparation 11 12 13 14 GND ROUT+ ROUT– SE/BTL S1 SHUTDOWN GND LOUT– LOUT+ C1 1 C2 C13 VDD GND L IN+ GND L LINE– L HP VDD GND R HP R LINE– GND R IN+ C10 + TP A00242 EVM Board SLOP275 U1 + TEXAS INSTRUMENTS R2 R1 PCBEEP C1 C12 C6 C5 C4 R3 S2 C7 [...]

  • Page 15

    Quick Start List for Stand-Alone 2-5 Quick Start 2.3 Quick Start List for Stand-Alone Follow these steps to use the TP A0242 EVM stand-alone or when connecting it into existing circuits or equipment. Connections to the TP A0242 module header pins can be made via individual sockets, wire-wrapping, or soldering to the pins, either on the top or the b[...]

  • Page 16

    Quick Start List for Stand-Alone 2-6 Quick Start Evaluation module preparations 6) T o allow the module SE/BTL control input to switch the amplifier IC between single ended (SE) and bridge-tied load (BTL) output modes, set output mode jumper S3 to OFF . T o keep the module amplifier IC in the single-ended output mode regardless of the control input[...]

  • Page 17

    3-1 Details Details This chapter provides details on the TP A0242 IC, the evaluation module, and the steps in the Quick-Start List, additional application information, and a parts list for the TP A0242 evaluation module. T opic Page 3.1 Precautions 3–2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .[...]

  • Page 18

    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 19

    The TP A0242 Audio Power Amplifier Evaluation Module 3-3 Details 3.2 The TP A0242 Audio Power Amplifier Evaluation Module The TP A0242 audio power amplifier evaluation module is powered by a TP A0242 stereo power amplifier capable of delivering greater than 2 W of continuous power per channel into 3- Ω loads. The amplifier IC can be operated in e[...]

  • Page 20

    The TP A0242 Audio Power Amplifier Evaluation Module 3-4 Details Figure 3–3. TP A0242 EVM Schematic Diagram R4 100 k Ω C12 10 µ F GND GND RLINEIN PCB ENABLE SHUTDOWN VOLUME ROUT+ LOUT+ ROUT– LOUT– SE/BTL LIN PC–BEEP BYP ASS GND GND RHPIN LLINEIN V DD LHPIN PV DD PV DD CLK RIN 10 9 12 11 6 5 8 7 2 1 4 3 23 22 21 20 19 18 17 16 15 14 13 24[...]

  • Page 21

    The TP A0242 Audio Power Amplifier Evaluation Module 3-5 Details Figure 3–4. TP A0242 Amplifier IC MUX SE/BTL MUX HP/LINE VOLUME CONTROL PC BEEP L LINE L HP VOLUME PC BEEP L IN R HP R LINE R IN 3.2.2 Inputs and Gain Each channel has two separate signal inputs, line and headphone ( HP ), that are automatically selected with the output mode (SE/BTL[...]

  • Page 22

    The TP A0242 Audio Power Amplifier Evaluation Module 3-6 Details Potentiometer R2 adjusts the gain of the internal preamp stage of the TP A0242 amplifier by adjusting the control voltage applied to the VOLUME terminal (pin 3) of the IC. Rotating the potentiometer slider clockwise decreases the applied control voltage, resulting in a higher volume. [...]

  • Page 23

    The TP A0242 Audio Power Amplifier Evaluation Module 3-7 Details 3.2.4 Depop Circuitry The TP A0242 amplifier IC contains internal circuitry to minimize the various transients that might appear at the output during the transition from power off or shutdown to normal operation, or when transitioning between the SE and BTL modes. 3.2.5 BTL Operation [...]

  • Page 24

    Using The TP A0242 EVM With the Plug-N-Play Evaluation Platform 3-8 Details 3.3 Using The TP A0242 EVM W ith the Plug-N-Play Evaluation Platform The TP A0242 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. The following paragraphs provide addition[...]

  • Page 25

    Using The TP A0242 EVM With the Plug-N-Play Evaluation Platform 3-9 Details 3.3.2 TP A0242 Module Jumper Settings and Switches The TP A0242 EVM is equipped with a pushbutton SPST switch and a jumper that acts as an SPST switch to allow module operation to be modified to suit various requirements. In the following discussion, setting a jumper to ON [...]

  • Page 26

    Using The TP A0242 EVM With the Plug-N-Play Evaluation Platform 3-10 Details 3.3.2.1 S1 — Shutdown Switch Pushbutton switch S1 on the EVM allows the manual shutdown of the TP A0242 amplifier IC. 3.3.2.2 S3 — Output Mode Jumper T o keep the module amplifier IC in the single-ended output mode regardless of the module control input state, set jump[...]

  • Page 27

    Using The TP A0242 EVM With the Plug-N-Play Evaluation Platform 3-1 1 Details 3.3.3 Signal Routing Signal flow on the platform is controlled by two signal routing switches, as shown in Figure 3 – 6. Figure 3–6. 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 Headph[...]

  • Page 28

    Using The TP A0242 EVM With the Plug-N-Play Evaluation Platform 3-12 Details 3.3.4 Mute (Shutdown)/Mode The TP A0242 EVM is equipped with a shutdown control input pin. When this input is pulled to ground, the TP A0242 amplifier IC on the module enters the shutdown mode and dissipates very little power . While in the shutdown mode, the PC BEEP input[...]

  • Page 29

    Using The TP A0242 EVM With the Plug-N-Play Evaluation Platform 3-13 Details 3.3.4.2 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 shutdown control input pin or the mode control input pin of the evaluation module. T o shut down the T[...]

  • Page 30

    Power Requirements 3-14 Details 3.3.5 Power Requirements The TP A0242 audio power amplifier evaluation module can operate from any voltage between approximately 4.5 V and 5.5 V ; however , the TP A0242 amplifier IC on the module is characterized for operation at 5 V . For best performance (highest output power with lowest distortion), the module sh[...]

  • Page 31

    Inputs and Outputs 3-15 Details 3.3.6 Inputs and Outputs The TI plug-n-play audio amplifier evaluation platform is equipped with several standard conectors for audio inputs and outputs. 3.3.6.1 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 A0242 EVM Stand-Alone 3-16 Details 3.4 Using The TP A0242 EVM Stand-Alone Using the TP A0242 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 requirement exists. Note that the shutdown s[...]

  • Page 33

    Using The TP A0242 EVM Stand-Alone 3-17 Details 3.4.2 TP A0242 EVM Connected for Single-Ended Output Figure 3–10. TP A0242 EVM Connected for Stereo Single-Ended Output 33 µ F – 1000 µ F + + 33 µ F – 1000 µ F Audio Input (Right) Audio Input (Left) 5 V GND ROUT+ ROUT– SE/BTL S1 SHUTDOWN GND LOUT– LOUT+ C1 1 C2 C13 VDD GND L IN+ GND L LI[...]

  • Page 34

    TP A0242 Audio Power Amplifier Evaluation Module Parts List 3-18 Details 3.5 TP A0242 Audio Power Amplifier Evaluation Module Parts List T able 3–4. TP A0242 EVM Parts List Reference Description Size EVM Qty . Manufacturer/ Part Number Digi-Key Number C5 Capacitor , 0.1 µ F , 10%, nonpolarized 0805 1 Murata GRM40-X7R104K25 C1, C2, C3, C4, C7, C8[...]