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Summary of Contents for Texas Instruments TPA032D04
- Page 1 TPA032D04 Class D Stereo Audio Power Amplifier Evaluation Module User’s Guide September 2000 Mixed-Signal Products SLOU068A...
- Page 2 IMPORTANT NOTICE Texas 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 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.
- Page 3 TI Plug-N-Play Audio Amplifier Evaluation Platform (TI Literature Number SLOU011) provides detailed information on the evaluation platform and its use with TI audio evaluation modules. TPA032D04 CLASS-D STEREO AUDIO POWER AMPLIFIER (TI Literature Number SLOS203) This is the data sheet for the TPA032D04 audio amplifier integrated circuit.
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Page 5: Table Of Contents
........3-10 Using the TPA032D04 Class-D EVM With the Plug-N-Play Platform .... - Page 6 ......... . . 3–3 Platform Jumper and Switch Settings for the TPA032D04 EVM Power Inputs ..
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Page 7: Introduction
Chapter 1 Introduction This chapter provides an overview of the Texas Instruments (TI ) TPA032D04 class-D stereo audio power amplifier evaluation module (SLOP131). It includes a list of EVM features, a brief description of the module illustrated with a pictorial diagram, and a list of EVM specifications. - Page 8 Feature Highlights 1.1 Feature Highlights The TI TPA032D04 class-D stereo audio power amplifier evaluation module and the TI plug-n-play audio amplifier evaluation platform include the following features: TPA032D04 Class-D Stereo Audio Power Amplifier Evaluation Module Internal depop circuitry to significantly reduce turn-on transients in...
- Page 9 Description 1.2 Description The TPA032D04 class-D stereo audio power amplifier evaluation module is a complete, 10-W per channel stereo audio power amplifier. It consists of the TI TPA032D04 class-D stereo audio power amplifier IC along with a small number of other parts mounted on a circuit board that measures approximately inches by 2 inches (Figure 1–1 and 1–2).
- Page 10 The platform has room for a single TPA032D04 class-D evaluation module and is a convenient vehicle for demonstrating TI’s audio power amplifier and related evaluation modules. The EVM simply plugs into the platform, which...
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Page 11: Tpa032D04 Class-D Evm Specifications
TPA032D04 Class-D EVM Specifications 1.3 TPA032D04 Class-D EVM Specifications = 4 Ω, unless otherwise noted. All measurements made with V = 5 V and R 1.3.1 Maximum Supply voltage range, V .......... - Page 12 Introduction...
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Page 13: Quick Start
Chapter 2 Quick Start Follow the steps in this chapter to quickly prepare the TPA032D04 class-D stereo audio amplifier EVM for use. Using the TPA032D04 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. -
Page 14: Precautions
Precautions 2.1 Precautions Power Supply Input Polarity and Maximum Voltage Always ensure that the polarity and voltage of the external power connected to V power input connector J1, J2, and/or V 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. -
Page 15: Quick Start List For Platform
Platform Preparations 1) Ensure that all external power sources are set to OFF . 2) Install a TPA032D04 module in platform socket U2, taking care to align the module pins correctly (EVM power pins engage sockets U2 and U3). 3) Set switch S2 to OFF . -
Page 16: Quick Start List For Stand-Alone
(2 V to 5 V or left floating) for normal operation, or low (tied to ground) to shut down the TPA032D04 amplifier IC on the EVM. Note that the control signals applied to the EVM Mode, Mute, and SD inputs must have sufficient current capability to overcome the 100-kΩ... -
Page 17: Details
Chapter 3 Details This chapter provides details on the TPA032D04 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 TPA032D04 class-D evaluation module, module performance graphs, and module PCB layer illustrations. -
Page 18: Precautions
Precautions 3.1 Precautions Power Supply Input Polarity and Maximum Voltage Always ensure that the polarity and voltage of the external power connected to V power input connector J1, J2, and/or V 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. -
Page 19: The Tpa032D04 Class-D Audio Power Amplifier Evaluation Module
The TPA032D04 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 filter to three small capacitors and two small inductors per class-D channel. - Page 20 The TPA032D04 Class-D Audio Power Amplifier Evaluation Module Figure 3–2. The TI TPA032D04 Class-D Stereo Audio Power Amplifier EVM— Top View Texas Instruments 1999 RHPGND +RIN– Mode –LIN+GND Note: Capacitors C15 and C16 are optional (not assembled) and locations for them on the EVM PCB have been provided to increase design flexibility and allow decoupling capacitance to be added (Section 3.7 Power Supply Decoupling ).
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Page 21: Tpa032D04 Class-D Evm Schematic Diagram
(beyond input isolation and output filtering). A full range of protection features are built into the TPA032D04 amplifier IC to increase device reliability: thermal, overcurrent, and undervoltage shutdown, with status terminals that report any error conditions encountered. -
Page 22: Overview Of Class-D Audio Amplifiers
The TPA032D04 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. -
Page 23: Bridge-Tied Load (Btl) Operation
(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 TPA032D04 amplifier IC data sheet, TI Literature Number SLOS203. -
Page 24: Class-D Differential And Headphone Single-Ended Inputs
3.2.4 Class-D Differential and Headphone Single-Ended Inputs The TPA032D04 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. 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–... -
Page 25: Tpa032D04 Class-D Evm Test Points
The TPA032D04 Class-D Audio Power Amplifier Evaluation Module 3.2.6 TPA032D04 Class-D EVM Test Points Test points have been included on the TPA032D04 class-D EVM to facilitate user analysis of device performance and design adjustments. Table 3–2 lists each test point and its corresponding function. -
Page 26: Class-D Amplifier Design Considerations
Class-D Amplifier Design Considerations 3.3 Class-D Amplifier Design Considerations Detailed information for proper design and implementation of TI class-D audio power amplifiers is located in the application report Design Considerations for Class-D Audio Power Amplifiers , TI Literature Number SLOA031, on the TI website (http://www.ti.com/sc/apa). -
Page 27: Using The Tpa032D04 Class-D Evm With The Plug-N-Play Platform
Using the TPA032D04 Class-D EVM With the Plug-N-Play Platform 3.4 Using the TPA032D04 Class-D EVM With the Plug-N-Play Platform The TPA032D04 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. -
Page 28: Module Switches
TPA032D04 EVM. 3.4.2.2 S2 — Mute Switch Pushbutton switch S2 on the TPA032D04 class-D EVM allows manual muting of the amplifier IC. S2 connects the amplifier IC MUTE pin to ground, muting the output. The EVM Mute control input pin also allows external control of this function. -
Page 29: Platform Signal Routing And Outputs
S3. The platform headphone output jack (J10) is not used in conjunction with the TPA032D04 class-D EVM. Switch S3 should be set to the U5 position when the TPA032D04 class-D EVM is installed on the platform. -
Page 30: Mute/Mode And Polarity Control
Shutdown The TPA032D04 class-D EVM is equipped with a shutdown control input pin. When this input is tied to GND, the TPA032D04 amplifier IC on the module enters the shutdown mode and dissipates very little power. When the EVM control input is tied to V or allowed to float, amplifier operation resumes. - Page 31 NOT installed in U5 . Set jumper JP6 to MUTE when a separate headphone amplifier IS installed in U5 . This will cause the TPA032D04 class-D EVM to shut down when a plug is inserted into platform headphone jack J10.
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Page 32: Platform Jumper And Switch Settings For The Tpa032D04 Evm Power Inputs
User’s Guide for the TI plug-n-play audio amplifier platform, TI Literature Number SLOU011 for more information). The TPA032D04 class-D EVM requires no setup for power source selection. Table 3–3. Platform Jumper and Switch Settings for the TPA032D04 EVM Power Inputs POWER TYPE (Note 2) VCC (J1) -
Page 33: Typical Headphone Plug
(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 TPA032D04 class-D power amplifier EVM to operate in the highly-efficient bridge-tied load configuration when driving speakers. -
Page 34: Tpa032D04 Class-D Evm Stand-Alone Connections For Stereo Btl Output
(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. TPA032D04 Class-D EVM Stand-Alone Connections for Stereo BTL Output LED 1 12 V... -
Page 35: Input Connections
Using the TPA032D04 Class-D EVM Stand-Alone 3.5.2 Input Connections The class-D amplifier 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–... -
Page 36: Class-D Amplifier Frequency Response At 4 Ω
TPA032D04 Class-D EVM Performance Characteristics 3.6 TPA032D04 Class-D EVM Performance Characteristics The TPA032D04 class-D stereo audio power amplifier EVM was tested using an Audio Precision System II, model 2322, a 12-V regulated dc power supply, and the TI PNP audio power amplifier evaluation platform set up as described in Chapter 2. -
Page 37: Class-D Amplifier Distortion Versus Output Power At 4 Ω
TPA032D04 Class-D EVM Performance Characteristics Figure 3–12. Class-D Amplifier Distortion versus Output Power at 4 Ω TOTAL HARMONIC DISTORTION PLUS NOISE OUTPUT POWER V DD = 12 V R L = 4 Ω TA = 25 C 0.02 0.01 P O – Output Power – W Figure 3–13. -
Page 38: Class-D Amplifier Distortion Versus Frequency At 1 W Into 4 Ω
TPA032D04 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. -
Page 39: Class-D Amplifier Crosstalk Versus Frequency Into 4 Ω
TPA032D04 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 for a constant 10-W, 7.5-W, and 5-W output. Several factors affect crosstalk, such as component selection (especially the inductor), filter layout, grounding, and power supply decoupling. -
Page 40: Class Ab Headphone Amplifier Frequency Response
TPA032D04 Class-D EVM Performance Characteristics Headphone amplifier graphs are shown in Figures 3–18 through 3–21 below. The frequency response shown in Figure 3–18 is 0 dB over most of the 20 Hz – 20 kHz frequency range. The sharp rolloff at low frequencies is due to the combination of the two high-pass filters of the circuit (input and output corner frequencies), and can be improved by changing the value of the input filter. -
Page 41: Class Ab Headphone Amplifier Distortion Versus Output Power
TPA032D04 Class-D EVM Performance Characteristics Figure 3–19. Class AB Headphone Amplifier Distortion versus Output Power TOTAL HARMONIC DISTORTION PLUS NOISE OUTPUT POWER V DD = 12 V R L = 32 Ω TA = 25 C 20 kHz 1 kHz 0.01... -
Page 42: Class Ab Headphone Amplifier Crosstalk Versus Frequency
TPA032D04 Class-D EVM Performance Characteristics EVM crosstalk is shown in Figure 3–21 for an output power of 50 mW. Figure 3–21. Class AB Headphone Amplifier Crosstalk versus Frequency CROSSTALK FREQUENCY V DD = 12 V R L = 32 Ω... -
Page 43: Tpa032D04 Class-D Evm Power Supply Decoupling Data
TPA032D04 Class-D EVM Power Supply Decoupling Data 3.7 TPA032D04 Class-D EVM Power Supply Decoupling Data The decoupling capacitance required will depend upon the application. Pads and through-holes have been provided on the EVM for the addition of bulk capacitance (see the schematic). A plot showing the impact of various levels of bulk capacitance on the voltage ripple on the power supply line is shown in Figure 3–22. -
Page 44: Tpa032D04 Class-D Evm/Plug-N-Play Platform Interconnects
TPA032D04 Class-D EVM Interconnects 3.8 TPA032D04 Class-D EVM Interconnects Table 3–4 shows the correlation between the TPA032D04 class-D amplifier IC pins, the EVM pins, and the plug-n-play (PNP) platform sockets. Table 3–4. TPA032D04 Class-D EVM/Plug-N-Play Platform Interconnects CLASS-D EVM PLUG-N-PLAY PLATFORM... -
Page 45: Tpa032D04 Class-D Evm Bill Of Materials
3.9 TPA032D04 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. TPA032D04 Class-D EVM Bill of Materials Manufacturer/ Reference Description Size Qty. -
Page 46: Tpa032D04 Class-D Evm Schematic Diagram
TPA032D04 Class-D EVM Schematic 3.10 TPA032D04 Class-D EVM Schematic The TPA032D04 class-D EVM schematic is shown in Figure 3–23. Figure 3–23. TPA032D04 Class-D EVM Schematic Diagram Ring Mode 100k 100k 100k Mute TPA032D04 Mute Mode SHUTDOWN COSC MUTE AGND 100k... -
Page 47: Tpa032D04 Class-D Evm Top Assembly
TPA032D04 Class-D EVM PCB Layers 3.11 TPA032D04 Class-D EVM PCB Layers The following illustrations depict the TPA032D04 class-D EVM PCB assembly and layers. These drawings are not to scale. Gerber plots can be obtained from any TI Sales Office. Figure 3–24. TPA032D04 Class-D EVM Top Assembly Figure 3–25. -
Page 48: Tpa032D04 Class-D Evm Top Layer
TPA032D04 Class-D EVM PCB Layers Figure 3–26. TPA032D04 Class-D EVM Top Layer Figure 3–27. TPA032D04 Class-D EVM Second Layer 3-32 Details... -
Page 49: Tpa032D04 Class-D Evm Third Layer
TPA032D04 Class-D EVM PCB Layers Figure 3–28. TPA032D04 Class-D EVM Third Layer Figure 3–29. TPA032D04 Class-D EVM Bottom Layer Details 3-33... - Page 50 3-34 Details...
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