Are these quick-charge power supplies (GaN or not) a good or bad idea for powering class-D amps?
And do they just default to their max output voltage when connected to an amp versus a notebook computer?
https://www.diyaudio.com/community/...90-mica-ddvp-12-5-ml-tqwt.389031/post-7182558
And do they just default to their max output voltage when connected to an amp versus a notebook computer?
https://www.diyaudio.com/community/...90-mica-ddvp-12-5-ml-tqwt.389031/post-7182558
well I read that PD (Power Delivery 3.1) supplies won't deliver over 100 watts if the power sink (the amp in this case) does not support the spec.
I suppose it all boils down to how the supply is designed. Many of these GaN supplies are used to power LED lighting which are just dumb devices so if they work for that then why not amps?
I suppose it all boils down to how the supply is designed. Many of these GaN supplies are used to power LED lighting which are just dumb devices so if they work for that then why not amps?
The class D amplifier power supply operates in a wide range of currents (from tens of mA to tens of A) at a constant voltage.
At mains frequency (50 / 60 Hz), a transformer winding with a heavy gauge wire, a high current rectifier and a large capacitor bank are required. If a linear regulator is used, it must provide maximum current and operate at up to 20 kHz, which is not an easy task. The power supply will be expensive and energy-intensive.
Therefore, AC\DC pulse converters are used. But the requirements for power supplies are high and different from the requirements for conventional chargers.
At mains frequency (50 / 60 Hz), a transformer winding with a heavy gauge wire, a high current rectifier and a large capacitor bank are required. If a linear regulator is used, it must provide maximum current and operate at up to 20 kHz, which is not an easy task. The power supply will be expensive and energy-intensive.
Therefore, AC\DC pulse converters are used. But the requirements for power supplies are high and different from the requirements for conventional chargers.
I use a 100W PD supply for my RPi MA12070P amplifier, which is designed for it:
https://it.aliexpress.com/item/1005...00024704189968!sea&curPageLogUid=cgapii8LfdiX
Works supremely well in my workshop.
https://it.aliexpress.com/item/1005...00024704189968!sea&curPageLogUid=cgapii8LfdiX
Works supremely well in my workshop.
oh, I see in the comments on that page that 1) the amp is conforming to the PD spec and 2) it only works at 20V
so that confirms what I thought. I'm looking for a 24V supply for a TPA3250 amp so this won't work.
"The input power of this module is compatible with PD adapter, QUALITY CONTROL adapter or 24V DC power supply.
When PD is used as a power supply, use type-C cable to connect the module and PD adapter, the module self-adapts PD output 20V DC"
I found more info on this subject and posted in this other thread.
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