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Summary of Contents for Texas Instruments TPA032D02
- Page 1 TPA032D02 Class D Stereo Audio Power Amplifier Evaluation Module User’s Guide September 2000 Mixed-Signal Products SLOU066A...
- 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. TPA032D02 CLASS-D STEREO AUDIO POWER AMPLIFIER (TI Literature Number SLOS243) This is the data sheet for the TPA032D02 audio amplifier integrated circuit.
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Page 5: Table Of Contents
........3-10 Using the TPA032D02 Class-D EVM With the Plug-N-Play Platform .... - Page 6 ......... . . 3–3 Platform Jumper and Switch Settings for the TPA032D02 EVM Power Inputs ..
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Page 7: Introduction
Chapter 1 Introduction This chapter provides an overview of the Texas Instruments (TI) TPA032D02 class-D stereo audio power amplifier evaluation module (SLOP245). 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
Feature Highlights 1.1 Feature Highlights The TI TPA032D02 class-D stereo audio power amplifier evaluation module and the TI plug-n-play audio amplifier evaluation platform include the following features: TPA032D02 Class-D Stereo Audio Power Amplifier Evaluation Module Internal depop circuitry to greatly reduce turn-on transients in outputs... -
Page 9: Description
Description 1.2 Description The TPA032D02 class-D stereo audio power amplifier evaluation module is a complete, 10-W per channel stereo audio power amplifier. It consists of the TI TPA032D02 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: Tpa032D02 Class-D Evm Specifications
The platform has room for a single TPA032D02 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... -
Page 11: Quick Start
Chapter 2 Quick Start Follow the steps in this chapter to quickly prepare the TPA032D02 class-D stereo audio amplifier EVM for use. Using the TPA032D02 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 12: 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 13: Quick Start List For Platform
Platform Preparations 1) Ensure that all external power sources are set to OFF. 2) Install a TPA032D02 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 14: 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 TPA032D02 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-kΩ... -
Page 15: Details
Chapter 3 Details This chapter provides details on the TPA032D02 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 TPA032D02 class-D evaluation module, module performance graphs, and module PCB layer illustrations. -
Page 16: 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 17: The Tpa032D02 Class-D Audio Power Amplifier Evaluation Module
4-Ω loads at less than 0.5% THD+N over a 20-Hz to 20-kHz frequency range from a 12-V supply. The TPA032D02 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 18 The TPA032D02 Class-D Audio Power Amplifier Evaluation Module Figure 3–2. The TI TPA032D02 Class-D Stereo Audio Power Amplifier EVM— Top View Rout+ Rout– Texas Mute Instruments 2000 Mute Lout– Lout+ SLOP245 TPA032D02 EVM Board Rev. B Note: Capacitors C13 and C14 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 19: Tpa032D02 Class-D Evm Schematic Diagram
(beyond input isolation and output filtering). A full range of protection features are built into the TPA032D02 amplifier IC to increase device reliability: thermal, overcurrent, and undervoltage shutdown, with status terminals that report any error conditions encountered. -
Page 20: Overview Of Class-D Audio Amplifiers
The TPA032D02 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 21: 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 TPA032D02 amplifier IC data sheet, TI Literature Number SLOS243. -
Page 22: Class-D Differential Inputs
Module pins are provided for easy connection of off-board control and monitoring. There are two active low fault indicator pins on the TPA032D02 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. -
Page 23: Tpa032D02 Class-D Evm Test Points
The TPA032D02 Class-D Audio Power Amplifier Evaluation Module 3.2.6 TPA032D02 Class-D EVM Test Points Test points have been included on the TPA032D02 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 24: 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 appears 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 25 Using the TPA032D02 Class-D EVM With the Plug-N-Play Platform 3.4 Using the TPA032D02 Class-D EVM With the Plug-N-Play Platform The TPA032D02 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 26 3.4.2.2 S2 — Mute Switch Pushbutton switch S1 on the TPA032D02 class-D EVM allows manual muting of the amplifier IC. S1 connects the amplifier IC MUTE pin to ground, muting the output. The EVM Mute control input pin also allows external control of this function.
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Page 27: Platform Signal Routing And Outputs
S3. The platform headphone output jack (J10) is not used in conjunction with the TPA032D02 class-D EVM. Switch S3 should be set to the U5 position when the TPA032D02 class-D EVM is installed on the platform. -
Page 28: Mute/Mode And Polarity Control
Shutdown The TPA032D02 class-D EVM is equipped with a shutdown control input pin. When this input is tied to GND, the TPA032D02 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 29 Set jumper JP6 to MODE when a separate headphone amplifier is NOT installed in U5. Set jumper JP6 to MUTE when a separate headphone amplifier IS installed in U5. This will cause the TPA032D02 class-D EVM to shut down when a plug is inserted into platform headphone jack J10. 3.4.4.3...
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Page 30: Platform Jumper And Switch Settings For The Tpa032D02 Evm Power Inputs
User’s Guide for the TI plug-n-play audio amplifier platform, TI Literature Number SLOU011 for more information). The TPA032D02 class-D EVM requires no setup for power source selection. Table 3–3. Platform Jumper and Switch Settings for the TPA032D02 EVM Power Inputs POWER TYPE (Note 2) VCC (J1) -
Page 31: 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 TPA032D02 class-D power amplifier EVM to operate in the highly-efficient bridge-tied load configuration when driving speakers. -
Page 32: Tpa032D02 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. TPA032D02 Class-D EVM Stand-Alone Connections for Stereo BTL Output LED 1 12 V... - Page 33 Using the TPA032D02 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–...
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Page 34: Class-D Amplifier Frequency Response At 4 Ω
TPA032D02 Class-D EVM Performance Characteristics 3.6 TPA032D02 Class-D EVM Performance Characteristics The TPA032D02 class-D stereo audio power amplifier EVM was tested using an Audio Precision System II, model 2322, a 5-V and 12-V regulated dc power supply, and the TI PNP audio power amplifier evaluation platform set up as described in Chapter 2. -
Page 35: Class-D Amplifier Distortion Versus Output Power At 4 Ω
TPA032D02 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 36: Class-D Amplifier Distortion Versus Frequency At 1 W Into 4 Ω
TPA032D02 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 37: Class-D Amplifier Crosstalk Versus Frequency Into 4 Ω
TPA032D02 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 5-W, 7.5-W, and 10-W output. Several factors affect crosstalk, such as component selection (especially the inductor), filter layout, grounding, and power supply decoupling. - Page 38 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 3–18.
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Page 39: Tpa032D02 Class-D Evm/Plug-N-Play Platform Interconnects
TPA032D02 Class-D EVM Interconnects 3.8 TPA032D02 Class-D EVM Interconnects Table 3–4 shows the correlation between the TPA032D02 class-D amplifier IC pins, the EVM pins, and the plug-n-play (PNP) platform sockets. Table 3–4. TPA032D02 Class-D EVM/Plug-N-Play Platform Interconnects CLASS-D EVM PLUG-N-PLAY PLATFORM... -
Page 40: Tpa032D02 Class-D Evm Bill Of Materials
3.9 TPA032D02 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. TPA032D02 Class-D EVM Bill of Materials Manufacturer/ Reference Description Size Qty. -
Page 41: Tpa032D02 Class-D Evm Schematic Diagram
TPA032D02 Class-D EVM Schematic 3.10 TPA032D02 Class-D EVM Schematic The TPA032D02 class-D EVM schematic is shown in Figure 3–19. Figure 3–19. TPA032D02 Class-D EVM Schematic Diagram 100k 100k 12 V TPA032D02 Mute SHUTDOWN COSC MUTE AGND 1000pF Mute AGND AGND 1µF... -
Page 42: Tpa032D02 Class-D Evm Top Assembly
TPA032D02 Class-D EVM PCB Layers 3.11 TPA032D02 Class-D EVM PCB Layers The following illustrations depict the TPA032D02 class-D EVM PCB assembly and layers. These drawings are not to scale. Gerber plots can be obtained from any TI Sales Office. Figure 3–20. TPA032D02 Class-D EVM Top Assembly Rev. -
Page 43: Tpa032D02 Class-D Evm Top Layer
TPA032D02 Class-D EVM PCB Layers Figure 3–22. TPA032D02 Class-D EVM Top Layer Figure 3–23. TPA032D02 Class-D EVM Second Layer Details 3-29... -
Page 44: Tpa032D02 Class-D Evm Third Layer
TPA032D02 Class-D EVM PCB Layers Figure 3–24. TPA032D02 Class-D EVM Third Layer Figure 3–25. TPA032D02 Class-D EVM Bottom Layer 3-30 Details...
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