Power supply Linear or Switching

[Nico Ras]

Hi Guys,

I have been using SMPS in my listening class A amps for two years now and will never go back to big transformers. Who inspired this was NUUK. The SMPS is +-40V at 30 Amp continuous rated. The sound is so much more fluid and bass is much tighter and controlled.

I was sceptical in the beginning but after making the change, I was immediately converted.

Kind regards

Nico

[The golden mean]

Originally posted by Williams Audio
Hi all,
I see this combat is not balanced, but still, speakers of ribbon and ESL nature are the heavy loads, and for a long bass replay say at 30Hz, 50% duty cycle of loud volume will be need very high currents for long time, as you can see what is my occupation, be sure I know a thing or two about high pwr SPS at high voltage.
In any case take a look at VICORE there are exotic in this field.
In any case if you find some thing good, be kind and let me know.
Best regards and happy weekend
Williams

There are some interesting statements on the subject here:

http://www.speakerplans.com/forum/A-...766_page3.html

[Steve Dunlap]

Originally posted by Williams Audio
Hi all,
OK, if is so good show me what you have done!
Did you make a SPS for +/-45Vdc at 2A, with 30 A peaks capability for 50% duty cycle at a complex load?
If is that easy why not using it, if is that cheap let do it, if is that good every body should have it in their amps,
Not to forget PC SPS is made by millions of one design and the high currents are at low voltages, the sound blasters have a separate PS unit with on boards; High quality regulators that sense the noise and spikes and a servo loop cancel the noises.
So, if some body has a simple good SPS for a high pwr amp, I will be the first one to get in touch and build it
Any one can help?
Best regards
Williams

You started off talking about class A amps. The power supply load you now describe will never happen with class A.

What you are asking for can and has been done. It can be manufactured cheaply, made reliable and safe for the consumer. I worked on a design project to do just this. The design belongs to the company I worked for, so I can not post it. I assure you, if you are serious about having the supply you describe designed, there are many engineers that can do it. Don't expect it for free.

[ostripper]

By williams Audio - Did you make a SPS for +/-45Vdc at 2A, with 30 A peaks capability for 50% duty cycle at a complex load?

I didn't, but good one's exist.. I am laying out this one now.
+/-80V 7Amp SMPS

A real adventure..
OS

[Nico Ras]

Originally posted by ostripper


I didn't, but good one's exist.. I am laying out this one now.
+/-80V 7Amp SMPS

A real adventure..
OS

Hi OS,

look up this chip, AP3101 we use it in production. Application example is good for trying it out.

Nico

[h_a]

So, if some body has a simple good SPS for a high pwr amp

See, it's a bit hard to help you if you ignore replies

SMPS need somebody that has the knowledge, does the pcb-layout, tests it, does a group buy and writes a tutorial with the specs for the inductors that you will need to wind yourself.

If that is not a real show-stopper, than I don't know

Anyway, the couple of noise plots I've seen so far (Infineon) are much noisier (still!) than a stock psu. Don't forget that a lot of SMPS also have a linear regulator at their output, so max current and slewing is mostly affected by this regulator and not the SMPS.

I would stay away from it (for most amps, I'm not talking PA).

Have fun, Hannes

[emanuel_hr]

For lower noise one should try a LLC resonant SMPS. The waveform is more sine-like thus it has a lot less harmonic content. Also a high switching frequency(1Mhz) should also help(easier to filter out and much higher than audio bandwidth), though the design becomes even more challenging.
Indeed, adding a linear reg after the SPS will ruin the efficiency.