TPA311 Audio Power Amplifier Evaluation Module User’s Guide 1998 Mixed-Signal Products
TPA311 Audio Power Amplifier Evaluation Module User’s Guide SLOU013 February 1998 Printed on Recycled Paper
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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. TPA311 350-mW LOW-VOLTAGE AUDIO POWER AMPLIFIER (literature number SLOS207) This is the data sheet for the TPA311 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 TPA311 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 TPA311 Audio Amplifier Evaluation Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 Quick Start Platform Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Quick Start Module Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1 Introduction This chapter provides an overview of the Texas Instruments (TI) TPA311 Audio Amplifier Evaluation Module (SLOP116). 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 1–3 1.2 Description 1–4 1.
1-2 Introduction
Feature Highlights 1.1 Feature Highlights The TI TPA311 Audio Amplifier Evaluation Module and the TI Plug-N-Play Audio Amplifier Evaluation Platform include the following features: - - TPA311 Low-Voltage Audio Power Amplifier Evaluation Module J J J J J J J J J J - 3.
Description 1.2 Description The TPA311 Audio Power Amplifier Evaluation Module is a complete, lowpower single-channel audio power amplifier. It consists of the TI TPA311 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.
Chapter 2 Quick Start The steps in this chapter can be followed to quickly prepare the TPA311 audio amplifier EVM for use. While using the TPA311 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 on-board 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 TPA311 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 TPA311 EVM stand-alone or when connecting it into existing circuits or equipment. Connections to the TPA311 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 TPA311 IC, the evaluation module, and the steps in the Quick-Start List, additional application information, and a parts list for the TPA311 evaluation module. Topic Page 3.1 Precautions 3–2 3.2 The TPA311 Audio Power Amplifier Evaluation Module 3.2.1 TPA311 Audio Amplifier IC 3.2.2 BTL Operation 3.2.3 Single-Ended Operation 3.2.4 Module Gain 3.2.5 Shutdown 3–3 3–4 3–4 3–5 3–5 3–5 3.
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 on-board soldered-in fuses and cause other damage to the platform, installed evaluation modules, and/or the power source.
The TPA311 Audio Power Amplifier Evaluation Module 3.2 The TPA311 Audio Power Amplifier Evaluation Module The TPA311 Audio Power Amplifier Evaluation Module is powered by a TPA311 350-mW Low-Power Audio Amplifier IC and includes on-board gain adjustment, a shutdown control signal input with on-board switch, and can be operated in either the BTL or single-ended output mode.
The TPA311 Audio Power Amplifier Evaluation Module 3.2.1 TPA311 Audio Amplifier IC The TPA311 audio amplifier IC is a CMOS device intended primarily for bridge-tied 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 V and 5.5 V) and deliver up to approximately 350 mW into an 8-Ω, BTL (Figure 3 – 4).
The TPA311 Audio Power Amplifier Evaluation Module 3.2.3 SIngle-Ended Operation For single-ended operation, the module SE/BTL control input pin must be held high. The speaker (or headphone) load is connected to the module OUT+ output pin through a coupling capacitor, and to platform/system ground.
Using The TPA311 EVM With the Plug-N-Play Evaluation Platform 3.3 Using The TPA311 EVM With the Plug-N-Play Evaluation Platform The TPA311 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 TPA311 EVM with the platform. 3.3.
Using The TPA311 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 TPA311 Amplifier EVM R U4 TPA311 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 TPA311 EVM With the Plug-N-Play Evaluation Platform 3.3.3 Mute/Mode The TPA311 EVM is equipped with a mute (shutdown) control input pin. When this input is tied to VDD, the TPA311 amplifier IC on the module shuts down and assumes an ultra-low power mode. When the EVM control input is tied to GND or allowed to float, amplifier operation resumes.
Using The TPA311 EVM With the Plug-N-Play Evaluation Platform 3.3.3.2 Mute/Mode Select (JP6) A 3-pin jumper header (JP6) on the platform, functioning as a SPDT switch, routes the control signal from the headphone jack to either the mute control input pin or the mode control input pin of the evaluation module. J J 3.3.3.
Power Requirements 3.3.4 Power Requirements The TPA311 Audio Power Amplifier Evaluation Module can operate from any voltage between approximately 2 V and 5.5 V, however, the TPA311 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 TPA311 EVM Stand-Alone 3.4 Using The TPA311 EVM Stand-Alone Using the TPA311 Audio Power Amplifier Evaluation Module stand-alone is much the same as using it with the platform. The same 2-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 TPA311 EVM Stand-Alone 3.4.2 TPA311 EVM Connected for Single-Ended Output Figure 3–9.
TPA311 Audio Power Amplifier Evaluation Module Parts List 3.5 TPA311 Audio Power Amplifier Evaluation Module Parts List Table 3–1. TPA311 EVM Parts List Ref. Description R4 Trim Pot, 200 kΩ Cermet ST SL, (through hole) C5 Capacitor, 10 µF, 6.3 V C1 Size EVM Qty.
