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EPC has used GaN transistors to create a high-power Class-D two-channel audio energy amplifier design.
Instantiated in analysis equipment EPC9192, it’s able to pushing 700W/channel into 4Ω (or 2Ω) or 350W/channel into 8Ω. Bridging the 2 channels ends in 1.4kW drive into 4 to 8Ω.
Key elements, per channel, are a pair of 200V EPC2307 GaN transistors on a daughter card, managed by an Onsemi NCP51820 gate driver, and a PWM on a distinct daughter card.
Hats off to to EPC as a result of the PWM shouldn’t be an off-the-shelf IC however a self-oscillating design (~600kHz) put collectively from op-amps and comparators, and extra so as a result of, within the knowledge sheet, the corporate takes the time to credit designs from Williamson (Carver) and Veltman for inspiration.
EPC claims <0.005% THD+N, >120dB sign/noise ratio, 40µV noise flooring and flat to 0.5 dB from 5Hz to 20kHz “no matter load”.
Wanting on the knowledge sheet, <0.05% THD+N is true over a wider vary of frequencies and energy outputs, even as much as 600W at 1kHz into 4Ω.
Enter and output are ground-referenced, and two enter rails are required at between ±42V and ±85V – with no heatsinks wanted on the backside finish, and a pair of heatsinks plus pressured air required on the high finish. There isn’t a accompanying PSU design.
Protections embody: under-voltage, over-voltage, over-temperature and over-current.
Discover the product web page right here, which incorporates hyperlinks to circuit diagrams (check out the PWM), and the knowledge sheet right here, which incorporates efficiency plots and sufficient thermal knowledge for it to rely as a reference design.
Digikey has the equipment on the market right here, however don’t get too excited in case you are pondering ‘that may do for my front room’ as these price round £900.
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