Amplifier Gears Up Automotive Audio Design


Texas Instruments has unveiled a 2.1-MHz Class-D audio amplifier specifically designed for 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.

The compact chip supports high-resolution 96-kHz digital input. “Offering maximum output power of 75 W per channel, the device is claimed to feature the industry’s highest switching rate and is the only audio amplifier that switches above the AM band”, the firm said.

According to the Press release, several key features and benefits of the new audio amplifier include:-

  • Reduced 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.
  • Support for low impedance: Maintains stable audio playback while driving low impedance loads of 2 ohms.
  • 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-analog converter helps deliver a low system output noise of 42 uVrms for automotive designs like external amplifiers and head units.
  • Better thermal performance: Reduces power dissipation by as much as 60 percent compared to Class-AB amplifiers, greatly reducing the need for fans or large heat sinks.
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TI offers the PurePath Console graphical user interface to help designers easily configure the TAS6424-Q1. To simulate and optimize 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 authorized distributors. Pricing is US$5.97 in 1,000-unit quantities.

For further details, view the full Press release.




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