TPA301 Audio Power Amplifier Evaluation Module User’s Guide 2001 Mixed-Signal Products SLOU014A
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.
Preface Related Documentation From Texas Instruments J J TI Plug-N-Play Audio Amplifier Evaluation Platform (literature number SLOU011) provides detailed information on the evaluation platform and its use with TI audio evaluation modules. TPA301 350-mW Low-Voltage Audio Power Amplifier (literature number SLOS208) This is the data sheet for the TPA301 audio amplifier integrated circuit. FCC Warning This equipment is intended for use in a laboratory test environment only.
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Running Title—Attribute Reference Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Feature Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 TPA301 EVM Specifications .
Running Title—Attribute Reference Figures 1–1 2–1 2–2 3–1 3–2 3–3 3–4 3–5 3–6 3–7 3–8 3–9 The TI TPA301 Audio Amplifier Evaluation Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 Quick Start Platform Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Quick Start Module Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1 Introduction This chapter provides an overview of the Texas Instruments (TI) TPA301 audio amplifier evaluation module (SLOP115). It includes a list of EVM features, a brief description of the module illustrated with a pictorial diagram, and a list of EVM specifications. Topic Page 1.1 Feature Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2 1.2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Feature Highlights 1.1 Feature Highlights The TI TPA301 audio amplifier evaluation module and the TI plug-n-play audio amplifier evaluation platform include the following features: - - TPA301 Low-Voltage Audio Power Amplifier Evaluation Module J J J J J J - 1-2 3.
Description 1.2 Description The TPA301 audio power amplifier evaluation module is a complete, low-power single-channel audio power amplifier. It consists of the TI TPA301 350-mW low-voltage audio power amplifier IC along with a small number of other parts mounted on a circuit board that is approximately one and a quarter inches square (Figure 1–1). Figure 1–1.
1-4 Introduction
Chapter 2 Quick Start The steps in this chapter can be followed to quickly prepare the TPA301 audio amplifier EVM for use. While using the TPA301 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, the audio amplifier evaluation module can be used stand-alone by making connections directly to the module pins, and can be wired directly into existing circuits or equipment.
Precautions 2.1 Precautions Power Supply Input Polarity and Maximum Voltage Always ensure that the polarity and voltage of the external power connected to VCC power input connector J1, J2, and/or VDD 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.
Quick Start List for Platform 2.2 Quick Start List for Platform - Use the following steps when using the TPA301 EVM with the TI plug-n-play audio amplifier evaluation platform (see the platform user’s guide, SLOU011, for additional details). Numbered callouts for selected steps are shown in Figure 2–1 and details appear in Chapter 3.
Quick Start List for Stand-Alone 2.3 Quick Start List for Stand-Alone Use the following steps to use the TPA301 EVM stand-alone or when connecting it into existing circuits or equipment. Connections to the TPA301 module header pins can be made via individual sockets, wire-wrapping, or soldering to the pins, either on the top or the bottom of the module circuit board. Numbered callouts for selected steps are shown in Figure 2–2 and details appear in Chapter 3. Figure 2–2.
Chapter 3 Details This chapter provides details on the TPA301 IC, the evaluation module, and the steps in the Quick-Start List, additional application information, and a parts list for the TPA301 evaluation module. Topic Page 3.1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2 3.2 The TPA301 Audio Power Amplifier Evaluation Module . . . . . . . . . . . 3–3 3.3 Using The TPA301 EVM With The Plug-N-Play Evaluation Platform . . . . .
Precautions 3.1 Precautions Power Supply Input Polarity and Maximum Voltage Always ensure that the polarity and voltage of the external power connected to VCC power input connector J1, J2, and/or VDD 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.
The TPA301 Audio Power Amplifier Evaluation Module 3.2 The TPA301 Audio Power Amplifier Evaluation Module The TPA301 audio power amplifier evaluation module is powered by a TPA301 350-mW low-power audio amplifier IC and includes onboard gain adjustment, a shutdown control signal input with onboard switch, and can be operated in either the BTL or single-ended output mode.
The TPA301 Audio Power Amplifier Evaluation Module 3.2.1 TPA301 Audio Amplifier IC The TPA301 audio amplifier IC is a CMOS device intended primarily for bridgetied load (BTL) operation in battery-powered applications. It is supplied in a very small surface-mount package and has been designed to operate from low supply voltages (between approximately 2.5 V and 5.5 V) and deliver up to approximately 350 mW into an 8-Ω, BTL (Figure 3 – 4).
The TPA301 Audio Power Amplifier Evaluation Module In the single-ended mode, the amplifier inside the TPA301 IC that drives the OUT– line still operates and dissipates power even though it is not being used to help drive the load. A better choice for low-power applications that operate in the single-ended mode from time to time might be the TPA311 (SLOP116), which shuts down the unused internal amplifier for reduced power consumption when operating in the single-ended mode. 3.2.
Using The TPA301 EVM With the Plug-N-Play Evaluation Platform 3.3 Using The TPA301 EVM With the Plug-N-Play Evaluation Platform The TPA301 audio amplifier evaluation module was designed to be used with the TI plug-n-play audio amplifier evaluation platform. It simply plugs into socket U3 or U4. The following paragraphs provide additional details for using the TPA301 EVM with the platform. 3.3.
Using The TPA301 EVM With the Plug-N-Play Evaluation Platform 3.3.2 Signal Routing Signal flow on the platform is controlled by two signal routing switches, as shown in Figure 3 – 5. Figure 3–5. Platform Signal Routing and Outputs Off R Audio Input U1 Signal Conditioning U3 TPA301 Amplifier EVM R U4 TPA301 Amplifier EVM L + R – S2 L On – J7, J8, J9 Speaker Outputs L + U2 – U4 R U5 Stereo Headphone Amplifier R S3 + – J10 Headphone Output – GND L L + U5 3.3.2.
Using The TPA301 EVM With the Plug-N-Play Evaluation Platform 3.3.3 Muting The TPA301 EVM is equipped with a mute (shutdown) control input pin. When this input is tied to VDD, the TPA301 amplifier IC on the module shuts down and assumes an ultra-low power mode. When the control input is tied to GND or allowed to float, amplifier operation resumes.
Power Requirements 3.3.4 Power Requirements The TPA301 audio evaluation module can operate from any voltage between approximately 2.5 V and 5.5 V, however, the TPA301 amplifier IC on the module is characterized for operation at 3.3 V and 5 V. For best performance (highest output power with lowest distortion), the module should be operated at approximately 5 V unless there is a specific reason for operating it from a lower voltage.
Inputs and Outputs 3.3.5 Inputs and Outputs The TI plug-n-play audio amplifier evaluation platform is equipped with several standard conectors for audio inputs and outputs. 3.3.5.1 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). Certain signal conditioning and amplifier EVMs, however, may have additional signal input connectors mounted on the module circuit board.
Using The TPA301 EVM Stand-Alone 3.4 Using The TPA301 EVM Stand-Alone Using the TPA301 audio power amplifier evaluation module stand-alone is much the same as using it with the platform. The same 2.5-V to 5.5-V power supply range and the isolated OUT+ and OUT– lines for BTL operation requirement exists. Note that the mute signal applied to the EVM shutdown pins must be able to supply enough current to overcome the pulldown resistors on the modules (20 kΩ || 20 kΩ for two EVMs). 3.4.
Using The TPA301 EVM Stand-Alone 3.4.2 TPA301 EVM Connected for Single-Ended Output Figure 3–9. TPA301 EVM Connected for Stereo Single-Ended Output 5 VDC Shutdown +5 V C6 S1 GND R5 C3 C5 DL R1 C2 OUT– C4 R3 R2 Audio Input (Right) C1 U1 OUT+ Lit.
TPA301 Audio Power Amplifier Evaluation Module Parts List 3.5 TPA301 Audio Power Amplifier Evaluation Module Parts List Table 3–1. TPA301 EVM Parts List Ref. Description R4 Trim Pot, 200 kΩ Cermet ST SL, (through hole) C6 Capacitor, 10 µF, 6.3 V C1 Size EVM Qty.
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