GaN transistor based 1.9 MHz class-D audio amplifier

 

 

Worldwide, thousands of audiophile music lovers are seeking for best performing and smallest possible audio amplifiers. Since GaN transistors and compatible drivers are getting more and more common nowadays then here is the chance to use them up for such designs. All the surrounding components must be well-chosen, high bandwidth and best performing ones.

Using such a power amplifier, music lovers can be more satisfied with their audio systems.

 

SPECIFICATION:

- 1.9 MHz switching frequency

- over 93% of efficiency

- market leading total harmonic distortion

- capable to drive 2, 4 or 8 ohm speakers

- power input voltage range is 12 ÷ 80V

- up to 250W of continuous music output power

- GS61008P bottom-side cooled 100V / 90A / 7mOhm GaN transistor

- high current, low DC resistance shielded power inductors, together with MKT film capacitors for output filtering

- LM5113SD half bridge GaN drivers

- low ESR, high endurance electrolytic capacitors as power input buffers

- high bandwidth operational amplifiers, comparators and inverters for signal shaping

- finest possible 1.9 MHz triangle wave signal generated for PWM reference

- flat frequency response curve from 10 to 100 kHz

- balanced XLR and unbalanced RCA audio inputs are accepted

- adjustable input gain - using a potmeter - to tune to any DAC outputs

- high frequency buck converters for internal power supplies

- 40 x 40 x 10 mm heatsink on bottom side of the board

- small 95 x 58 x 40 mm form factor design