Amplifier transforms automotive audio design

5th December 2016
Posted By : Daisy Stapley-Bunten
Amplifier transforms automotive audio design

The first 2.1-MHz Class-D audio amplifier specifically designed for automotive applications has been developed by Texas Instruments (TI). Supporting high-resolution 96kHz digital input, the compact TAS6424-Q1 enables high-fidelity audio with low distortion in automotive infotainment applications.

The TAS6424-Q1 enables the use of smaller external filters and eliminates up to 18 external components to reduce system size and cost compared to existing Class-D solutions. With maximum output power of 75W per channel, the device features the industry’s highest switching rate and is the only audio amplifier that switches above the AM band.

Key features and benefits of the TAS6424-Q1 Class-D audio amplifier:

  • Reduces electromagnetic interference (EMI): Switching above the AM band eliminates the need for complex avoidance schemes and eases electromagnetic compatibility (EMC) designs while enabling the system to meet Comité International Spécial des Perturbations Radioélectriques (CISPR) 25 Class 5 EMC requirements.
  • Supports low impedance: Maintains stable audio playback while driving low impedance loads of 2Ω.
  • Advanced AC load diagnostics and line driver mode: The TAS6424-Q1 provides detailed on-chip phase and impedance measurements that designers can use to configure the device with various outputs, such as woofer, tweeter and line-level connections.
  • Enhanced audio quality: Improves distortion, power-supply rejection and dynamic response with high-frequency switching.
  • Lower noise: An integrated digital-to-analogue converter helps deliver a low system output noise of 42uVrms for automotive designs like external amplifiers and head units.
  • Better thermal performance: Reduces power dissipation by as much as 60% compared to Class-AB amplifiers, greatly reducing the need for fans or large heat sinks.

Tools and support to jump-start design
The PurePath Console graphical user interface is available to help designers easily configure the TAS6424-Q1. To simulate and optimise the device, designers can download an IBIS model or request a TAS6424-Q1 evaluation module.

The TAS6424-Q1 is available now in a PowerPAD thermally enhanced shrink small-outline package (HSSOP) from the TI store and authorised distributors. 


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