Evaluation boards aid audio amplifier design

GaN E-HEMT fast switching, low output capacitance (Coss), and zero reverse recovery charge (QRR) enable a new level of performance for Class D audio amplifiers.

The new GS-EVB-AUD-xxx1-GS GaN-based evaluation board platform from GaN Systems, provides an excellent reference design for implementing a high-performance, low-cost audio system.

The Class D amplifier and companion power supply designs are optimised for sound quality, thermal performance, size and cost.

Key features of the 2-channel Class D amplifier include:

• Complete Class D amplifier
• Multi audio signal inputs
• Bridge-tied load output
• Option to switch between open-loop and closed-loop designs with optimized DSP control of each configuration
• High-performance audio
• 200 W/Ch (8 Ω), 300 W/Ch (4 Ω)
• > 108 dB SNR and dynamic range
• < 0.01% THD+N (8 Ω, 1 W)
• +/- 0.5 dB frequency response (8 Ω)
• High-performance output
• 96% efficiency
• Reduced thermals

Key features of the companion switch mode power supply include:

• Complete audio LLC SMPS
• Universal AC line input
• Easy integration with GaN amplifier
• Common-mode AC filter
• High-performance audio
• 400 W continuous, 550 W peak
• +/- 32 VDC dual-rail output
• High-performance output
• No heatsinking, no cooling
• High efficiency, 40% loss decrease
• EMI/EMC friendly