GaN-based Class D power amps
Here is a EPC GaN chart showing all the different GaN fets, the ones in the 200w eGaNAMP2016 GaN Evaluation amp EPC2016C, judging by this chart are capable of capable 36A each with a rail of 100v. Then I hope this is right, think you’ve got the EPC2033 which has higher 150v but it can do a whopping 48A each!!!! And the EPC2022 and EPC2021 at 90A???? https://epc-co.com/epc/Portals/0/epc/documents/briefs/ab003%20egan%20fets%20for%20class-d%20audio.pd... Cheers George |
The quality of sound reproduced by the audio amplifier, measured by THD (Total Harmonic Distortion), DF (damping factor), and IMD (inter-modulation distortion) is influenced by the characteristics of the power transistors used.eGaN FETs’ near ideal switching performance due to lower propagation delays and faster slew rates (due to their lower gate capacitance) and zero QRR enable very short dead times to provide lower open loop distortion, lowering the THD and overall losses. This reduces feedback, driving down T-IMD and DF to provide a step jump in the sonic quality of Class-D audio amplifiers and lowering overall losses Everything I've been telling you about reducing or eliminating dead time is in the above statement from the pdf you linked, quoted above. They are so cheap now its hard to imagine why someone would not use them. |
I’ve been telling you about reducing or eliminating dead time I’ve never denied it, and have said it’s also a bonus with the GaN technology, and as I’ve always harped on about is the switching frequency giving better sound if used at 1.5536mHz so then output filter is not in contention as stated by Steve Colino of EPC designers of the GaN technology, and finally we’ll get to see bench test square waves that look like square waves like linear amps can do, and not like timber mill buzz saws . But it can also be done without heatsink if the switching frequency is used at 400khz as stated in the other pages of the the pdf I posted. Quote: " 200W per Channel into 8 ohms • 400W per Channel into 4 ohms. 96% Efficiency Reduces Heat and System Size • No Heat Sink Required" Affordable Amp manufacturers will not "use" the raw GaN fet component, only the more esoteric $$$$$ ones may design their own modules, if they’re suicidal. Most will wait till new OEM manufacturers like IcePower, PowerSoft, Hypex, Sangway, Tripath ect ect make them up using the GaN technology, so then it’s easier/cheaper just to put the complete module in a box with a power supply. |
