Fresh From the Bench: Improving GaN with Digital Control

The AX5689 is an eight-channel audio amplifier controller IC with digital inputs and CMOS level PWM outputs, enabling high-order digital control loops with post-filter feedback. This article, originally published in audioXpress, December 2023, reviews the Axign and GaN Systems Class-D audio amplifier reference design board, intended to demonstrate the benefits of Axign's digital controllers and its unique approach.

GaN power semiconductors pioneer GaN Systems has once again teamed up with Dutch company Axign to unveil an even more powerful, 1000W Class-D GaN audio amplifier board at CES 2023. The new reference design merges best-in-class technologies from GaN Systems and Axign to enable unique audio systems that are smaller, more efficient, and offer better audio quality. The design is ideal for automotive, professional, and prosumer audio applications.

Dayton Audio continues to expand its portfolio of wireless audio solutions with the introduction of new KAB Class D amplifier boards with Bluetooth streaming, to support any speaker build, or audio project for DIY enthusiasts or OEMs. Dayton also introduced a new updated version of one of its most popular amplifiers, with the new APA102BT Class D Stereo 60 WPC Bluetooth Amplifier, and launched the new DTA Pro, a complete amplifier with Bluetooth, USB DAC, and wireless remote control.