repurpose a hypex SMPS400N400 for a 3E AUDIO 260-2-29A PFFB Stereo amplifier?

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niekos

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Joined 2011
#1
I have a broken Hypex NC400 with a SMPS600N400 power supply (that is fine). The output of the supply is 2x 65V, too high for the 3e audio amp board (3E AUDIO 260-2-29A PFFB Stereo amplifier). Is it possible to step down the voltage of the SMPS600N400 to say 48V while maintaining the max 650 watt? Or is this not a good idea anyway and can I better buy also a new power supply that is already 48V (like the micro audio SPMP-R2)?
 
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#4
I was thinking about using a buck converter like this one, but I am not sure this will work good enough? I am not sure if this would defeat features of the supply like this (from hypex manual):
Conventional Switch Mode Power Supplies are commonly unsuitable for audio purposes due to poor peak power capabilities and the inability to handle reversed currents generated by Class D amplifiers as a load. The Hypex SMPS600 achieves these things by using an advanced over current protection circuit, a highly efficient 2quadrant DC/DC converter which is capable of handling reversed currents and has a peak power handling of many times its rated power.
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#5
Well, in that case (no trim pots), the power supply is not a regulated type... so you can't use it with 3e modules.

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niekos said:
I was thinking about using a buck converter like this one
Click to expand...

Not good... too low an output current capability....

Just get another power supply of the same type (they are still available) and then a couple of the latest Nilai500 modules... and have a ball.

Re 3e module(s) retrofit... you can't reduce that voltage (65V) at the required current (around 5A).. easily... so I'd not consider that as a valid option.

... or, sell the leftover power supply and the working module... and get one of the ready-made 3e integrated amps.
 
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#6
niekos said:
The output of the supply is 2x 65V, too high for the 3e audio amp board (3E AUDIO 260-2-29A PFFB Stereo amplifier). Is it possible to step down the voltage of the SMPS600N400 to say 48V while maintaining the max 650 watt?
Click to expand...
It is possible, but you will have to unwind the turns in the transformer.
Or you can just buy the same power supply, but for 48V.
https://www.diyaudio.com/community/...input-output-48v-aux-15v.408079/#post-7804737
For your amplifier 3E AUDIO 260-2-29A PFFB Stereo amplifier it is not necessary to have two power supply poles. Therefore you can take any pulse power supply for 48V with the current suitable for you, your amplifier has a bridged output, so it is not afraid of the pumping effect as in half-bridge amplifiers.
Ask Sous, he also makes monopolar power supplies for amplifiers.
 
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