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Summary of Contents for Texas Instruments TPA005D12
- Page 1 TPA005D12 Class D Stereo Audio Power Amplifier Evaluation Module User’s Guide August 1999 Mixed-Signal Products SLOU051A...
- 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 acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability.
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Page 3: Related Documentation From Texas Instruments
Trademarks TI is a trademark of Texas Instruments Incorporated. PowerPAD is a trademark of Texas Instruments Incorporated. Preface Chapter Title—Attribute Reference... -
Page 5: Table Of Contents
3.2.4 Class-D Differential Inputs 3.2.5 Control and Indicator Circuits 3.2.6 TPA005D12 Class-D EVM Test Points Class-D Amplifier Design Considerations Using The TPA005D12 Class-D EVM With the Plug-N-Play Platform 3.4.1 Installing and Removing EVM Boards 3.4.2 Module Switches 3.4.3 Signal Routing . - Page 6 Running Title—Attribute Reference Figures 1–1 The TI TPA005D12 Class-D Stereo Audio Power Amplifier EVM — Top View 1–2 The TI TPA005D12 Class-D Stereo Audio Power Amplifier EVM — Bottom View 2–1 Quick Start Platform Map ............
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Page 7: Introduction
This chapter provides an overview of the Texas Instruments (TI ) 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. -
Page 8: Feature Highlights
Feature Highlights 1.1 Feature Highlights The TI TPA005D12 class-D stereo audio power amplifier evaluation module and the 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... -
Page 9: Description
The TPA005D12 class-D stereo audio power amplifier evaluation module is a 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 ¼... -
Page 10: Tpa005D12 Class-D Evm Specifications
Amplifier evaluation Platform, or to be wired directly into existing circuits and equipment when used stand-alone. The platform has room for a single TPA005D12 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
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. -
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 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 TPA005D12 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 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-k input. -
Page 15: 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. -
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 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 Tpa005D12 Class-D Audio Power Amplifier Evaluation Module
4- 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 filter to three small capacitors and two small inductors per class-D channel. - Page 18 The TPA005D12 Class-D Audio Power Amplifier Evaluation Module Figure 3–2. The TI TPA005D12 Class-D Stereo Audio Power Amplifier EVM — TP11 Figure 3–3. The TI TPA005D12 Class-D Stereo Audio Power Amplifier EVM — TP12 Texas Instruments 1999 TP10 +RIN– –LIN+GND...
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Page 19: Tpa005D12 Class-D Stereo Audio Amplifier Ic
(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 report any error conditions encountered. -
Page 20: Overview Of Class-D Audio Amplifiers
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. -
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 TPA005D12 amplifier IC data sheet, TI Literature Number SLOS240. -
Page 22: Control And Indicator Circuits
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. -
Page 23: Tpa005D12 Class-D Evm Test Points
3.2.6 TPA005D12 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... -
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 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 TPA005D12 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. -
Page 26: Module Switches
23 mA of current. 3.4.2.2 S2 — Mute Switch Pushbutton switch S1 on the TPA005D12 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. -
Page 27: Signal Routing
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. -
Page 28: Shutdown
Shutdown The TPA005D12 class-D EVM is equipped with a 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 V... - Page 29 NOT installed in U5 . 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.
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Page 30: Power Requirements
User’s Guide for the TI plug-n-play audio amplifier platform, TI Literature Number SLOU011 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) VCC (J1) -
Page 31: Inputs And Outputs
(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. -
Page 32: Power Connections
(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 LED 0... -
Page 33: Controls And Indicators
FAULT0 (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. Using The TPA005D12 Class-D EVM Stand-Alone Details 3-19... -
Page 34: Tpa005D12 Class-D Evm Performance Characteristics
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. -
Page 35: Class-D Amplifier Distortion Versus Output Power At
Figure 3–12. Class-D Amplifier Distortion versus Output Power at 4 0.02 0.01 Figure 3–13. Class-D Amplifier Distortion versus Output Power at 8 0.02 0.01 TPA005D12 Class-D EVM Performance Characteristics TOTAL HARMONIC DISTORTION PLUS NOISE OUTPUT POWER V DD = 5 V R L = 4 TA = 25 C 1 kHz P O –... -
Page 36: Class-D Amplifier Distortion Versus Frequency At 1 W Into
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. -
Page 37: Class-D Amplifier Crosstalk Versus Frequency At 2 W Into
– 30 –40 – 50 – 60 – 70 – 80 – 90 TPA005D12 Class-D EVM Performance Characteristics CROSSTALK FREQUENCY V DD = 5 V R L = 4 P O = 2 W TA = 25 C f – Frequency – Hz... -
Page 38: Tpa005D12 Class-D Evm/Plug-N-Play Platform Interconnects
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 IC PIN... -
Page 39: 3.8 Tpa005D12 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 Capacitor, Ceramic Chip, 0.1 F, 10%,... -
Page 40: Tpa005D12 Class-D Evm Schematic Diagram
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 100k... -
Page 41: Tpa005D12 Class-D Evm Pcb Layers
3.10 TPA005D12 Class-D EVM PCB Layers The following illustrations depict the TPA005D12 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. TPA005D12 Class-D EVM Top Assembly Figure 3–20. -
Page 42: Tpa005D12 Class-D Evm Top Layer
TPA005D12 Class-D EVM PCB Layers Figure 3–21. TPA005D12 Class-D EVM Top Layer Figure 3–22. TPA005D12 Class-D EVM Second Layer 3-28 Details... -
Page 43: Tpa005D12 Class-D Evm Third Layer
TPA005D12 Class-D EVM PCB Layers Figure 3–23. TPA005D12 Class-D EVM Third Layer Figure 3–24. TPA005D12 Class-D EVM Bottom Layer Details 3-29... - Page 44 3-30 Details...
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