Amp demo board teams with audio-grade SMPS
Article By : Susan Nordyk
GaN Systems offers an amplifier evaluation kit with a 400-W continuous-output SMPS that enables high-power Class D audio designs
GaN Systems offers an amplifier evaluation kit with a 400-W continuous-output switch-mode power supply (SMPS) that enables high-power Class D audio systems. The plug-and-play design features a variety of audio signal inputs, bridge-tied load output, and open-loop/closed-loop toggling.
The evaluation board packs a two-channel Class D amplifier that provides 200 W per channel into 8 Ω or 300 W per channel into 4 Ω and achieves 96% efficiency. Its Class D output stage is implemented with 100-V GaN enhancement mode HEMT devices. Performance specifications include total harmonic distortion plus noise (THD+N) of less than 0.01% (8 Ω, 1 W, 20 Hz to 20 kHz) and frequency response of ±0.5 dB to 50 kHz. Also included is an onboard Renesas D2 Audio 24-bit, 300-MHz digital control processor with embedded DSP, integrated hardware accelerators, and PWM engine.
Leveraging 650-V GaN E-HEMTs, the evaluation bundle’s SMPS has a universal-input front end with power factor correction and a half-bridge LLC back end for high efficiency in small physical size. It delivers 400 W of continuous output power, 550 W peak, and provides fully regulated split-rail outputs.
The use of GaN power semiconductors enables audio design engineers to create premium audio products with enhanced sound quality, increased efficiency, and reduced size. In addition to the evaluation kit, GaN Systems offers a whitepaper that reviews the kit using a standard set of industry performance and validation tests.
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