Texas Instruments TPA3122D2EVM

Overview

TPA3122D2EVM from Texas Instruments is an evaluation module for the TPA3122D2 15 W stereo Class-D audio power amplifier in 20-pin PDIP package, operating from 10 V to 30 V supply, delivering 15 W per channel into 8 Ω at 10% THD+N with adjustable gain (20–36 dB) via dual jumpers, used for rapid prototyping of compact stereo audio amplification systems.

For engineers reviewing the TPA3122D2EVM datasheet, TPA3122D2EVM pinout, TPA3122D2EVM application, or TPA3122D2EVM equivalent, this module supports stand-alone operation with RCA input, banana-jack power/speaker connections, shutdown/mute controls, and gain configuration - critical for audio subsystem validation, speaker driver characterization, and Class-D efficiency benchmarking.

Technical Context

The TPA3122D2EVM implements a fully assembled reference design around the TPA3122D2 IC, integrating all required external components including 22 µH shielded inductors, 470 µF bulk capacitors, 0.1 µF bypass caps, and gain-setting jumpers (J1/J2) for precise 20/26/32/36 dB configurations. It uses a dual-channel differential-input Class-D architecture with integrated bootstrap circuitry (BSL/BSR pins) and clamp voltage regulation (VCLAMP).

Control logic includes TTL-compatible active-low SHUTDOWN (SW1) and active-high MUTE (SW2), both VCC-compliant, enabling system-level power sequencing and audio muting without signal path interruption. The board supports minimum 4 Ω load impedance and operates within strict thermal limits, with select components rated for >85 °C case temperature during normal use.

Key Specifications

Availability

TPA3122D2EVM is available at Aetrix Electronics and suitable for audio subsystem validation, Class-D amplifier reference design verification, and speaker driver performance testing requiring stable component supply and documented TI-qualified hardware.

Supply support for TPA3122D2EVM 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and digital signal technologies with over 90 years of innovation in high-reliability electronic systems.

The TPA3122D2EVM belongs to TI's audio power amplifier evaluation platform family, designed specifically to accelerate development of efficient, low-EMI stereo audio amplifiers for consumer, automotive, and industrial sound systems.

FAQ

What is the primary function of the TPA3122D2EVM?

The TPA3122D2EVM is a Texas Instruments evaluation module built around the TPA3122D2 stereo Class-D audio power amplifier IC. Its primary function is to provide a ready-to-use hardware platform for evaluating amplifier performance, validating speaker interface behavior, and prototyping audio output stages without custom PCB design. The TPA3122D2EVM includes all necessary passive components, gain configuration jumpers, and user-accessible controls for immediate bench testing.

Can the TPA3122D2EVM drive 4 Ω speakers?

Yes, the TPA3122D2EVM is explicitly rated for a minimum load impedance of 4 Ω per channel, as confirmed in Table 1 of the SLOU214A User's Guide. This capability allows direct connection to common low-impedance consumer speakers while maintaining stability and specified output power. The TPA3122D2EVM's layout and component selection-including 22 µH shielded inductors and 470 µF bulk capacitors-are optimized to support safe 4 Ω operation at full 15 W/channel output under 27 V supply conditions.

How do I configure the gain on the TPA3122D2EVM?

Gain on the TPA3122D2EVM is configured using two 2-position jumpers: J1 (GAIN0) and J2 (GAIN1). As defined in Table 2 of the SLOU214A guide, installing both jumpers yields 20 dB gain; removing one or both increases gain to 26 dB, 32 dB, or 36 dB. Each jumper connects its respective pin to GND when installed, and leaves it pulled to VCC when removed. The TPA3122D2EVM schematic shows these jumpers directly tied to U1 pins 14 (GAIN0) and 13 (GAIN1), matching the TPA3122D2N IC's gain control logic.

Does the TPA3122D2EVM include mute and shutdown functionality?

Yes, the TPA3122D2EVM provides dedicated front-panel controls for both functions: SW1 implements active-low SHUTDOWN (pin 2 of U1), and SW2 implements active-high MUTE (pin 3 of U1). Both signals are VCC-compliant and TTL-threshold compatible. Pressing SW1 forces the amplifier into low-power shutdown mode; releasing it restores operation. Pressing SW2 mutes audio output while preserving internal switching (50% duty cycle), allowing fast re-enable without startup delay. These controls are wired per the TPA3122D2EVM schematic and verified in Section 2.2.2 of the User's Guide.

What input and output connectors does the TPA3122D2EVM use?

The TPA3122D2EVM uses standard, field-serviceable connectors: RCA jacks (J9 and J10) for left and right analog audio inputs; banana jacks (J3–J8) for speaker outputs (LOUT, ROUT, GND) and power (VCC, GND); and test points (TP1–TP12) for signal monitoring. Input ground is routed separately (TP9) to minimize noise coupling. All connectors are listed in Table 3 of the Bill of Materials, with part numbers including Switchcraft PJRAN1X1U03 (RCA) and Johnson 111-2223-001 (banana jacks), ensuring mechanical reliability and repeatable lab connections.