Texas Instruments TPA321EVM

Overview

TPA321EVM from Texas Instruments is an evaluation module for the TPA321 350-mW mono audio power amplifier IC, designed to demonstrate bridge-tied load (BTL) or single-ended output operation with 2.5 V–5.5 V supply voltage, 350 mW into 8 Ω at 5 V (BTL), and ultralow shutdown current - used in portable audio prototyping and low-voltage speaker driver validation.

For engineers reviewing the TPA321EVM datasheet, TPA321EVM pinout, TPA321EVM application, or TPA321EVM equivalent, this page delivers verified specifications, platform integration details, stand-alone wiring guidance, thermal protection behavior, and stereo BTL/speaker-terminal interface constraints.

Technical Context

The TPA321EVM implements a complete, ready-to-use evaluation circuit for the TPA321DGN MSOP-8 audio amplifier IC, supporting both BTL and single-ended configurations via external jumpering and capacitor selection. It operates across 2.5 V–5.5 V VDD and delivers up to 350 mW into 8 Ω in BTL mode with internal thermal and short-circuit protection.

Designed for plug-and-play use with TI's SLOP097 platform, the module features single-in-line header pins on its underside for direct platform insertion or stand-alone wiring. Its PCB includes input coupling capacitors (1 µF), output coupling capacitors (10 µF for SE), shutdown control via momentary switch S1, and onboard bypass/decoupling (C6 = 5 pF).

Key Specifications

Availability

TPA321EVM is available at Aetrix Electronics and suitable for portable audio prototyping, low-voltage speaker driver validation, and educational amplifier lab setups requiring stable component supply and documented reference schematics.

Supply support for TPA321EVM includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and digital signal technologies, with over 90 years of innovation in power management and signal chain solutions.

The TPA321EVM belongs to TI's audio amplifier evaluation module product line, engineered to accelerate development of battery-powered audio subsystems using low-quiescent-current Class-AB amplifiers in compact MSOP packages.

FAQ

What is the TPA321EVM used for?

The TPA321EVM is an evaluation module for the TPA321 audio amplifier IC, enabling rapid validation of mono audio output in bridge-tied load (BTL) or single-ended configurations. It supports 2.5 V–5.5 V operation and delivers up to 350 mW into 8 Ω, making it ideal for portable speaker prototyping, classroom labs, and low-power audio system testing. The TPA321EVM includes all necessary passive components and header pins for platform integration or stand-alone use.

Can the TPA321EVM drive headphones directly?

Yes, the TPA321EVM can drive headphones in single-ended mode when configured with an appropriate output coupling capacitor (33 µF–1000 µF) between OUT+ and the headphone terminal, and GND as return. It delivers 75 mW into 32 Ω at 5 V, sufficient for most stereo headphones. However, the TPA321EVM does not include built-in stereo decoding or dual-channel amplification - two modules are needed for true stereo headphone output.

Does the TPA321EVM include thermal protection?

Yes, the TPA321EVM implements the internal thermal and short-circuit protection features of the underlying TPA321DGN IC. When die temperature exceeds safe limits during sustained high-power operation, the amplifier automatically shuts down and recovers once cooled. This behavior is inherent to the TPA321 IC and requires no external circuitry - confirmed in the SLOU089 user's guide and SLOS312 datasheet.

How do I configure the TPA321EVM for BTL vs. single-ended output?

To configure the TPA321EVM for BTL output, connect the speaker between OUT+ and OUT– pins with no coupling capacitor. For single-ended output, connect the speaker (or headphone) between OUT+ and GND through a 33 µF–1000 µF DC-blocking capacitor, leaving OUT– unconnected. These configurations are explicitly defined in Figures 2–3 and 2–4 of the SLOU089 user's guide.

Is the TPA321EVM compatible with TI's Plug-N-Play Audio Amplifier Evaluation Platform?

Yes, the TPA321EVM is fully compatible with TI's SLOP097 Plug-N-Play Audio Amplifier Evaluation Platform. Its underside-mounted single-in-line header pins allow direct insertion into platform sockets U3/U4. Platform jumpers (JP6, JP8) and switches (S2, S3) configure power routing, mute control, and signal conditioning - detailed in Tables 2–1 and 2–2 of the SLOU089 guide.