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Old 17th September 2013, 09:59 AM   #1
Nikitas is offline Nikitas  Greece
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Default SMPS recommendation

I'm looking for a SMPS to power opamps that do BalSE conversion.
Output voltage has to be +/- 16-18V and output at 1Amp or a little lower.


Any recommendations?

Thanks!
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Old 18th September 2013, 02:10 AM   #2
Jeff R is offline Jeff R  United States
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Describe the input voltage the power supply will be running off of? And why a switching supply and not a linear supply?
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Old 18th September 2013, 07:01 AM   #3
Nikitas is offline Nikitas  Greece
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230v mains.

The reasons I want smps are curiosity,weight,size,cost. But mostly, I'd like to hear how it would perform. I have never tried amps in audio before.
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Old 18th September 2013, 12:16 PM   #4
Jeff R is offline Jeff R  United States
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I am not experienced with off-line SMPSs, but if you go to ti.com and select their Web Bench tool for power supplies, you can enter your data and they will present a recommended design based upon the LM5023.

A simpler approach might be to user linear pre-regulator (a step down transformer, bridge rectifier and C filter) to generate around 24 volts, say, and then use a dc to dc converter after that. There are many ICs and circuit topologies you could use for that.

"Curiosity" is often a good reason to do something, or to at least explore an option.
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Old 18th September 2013, 12:38 PM   #5
marce is offline marce  United Kingdom
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Nothing wrong with a good SMPS.
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Old 18th September 2013, 12:40 PM   #6
Nikitas is offline Nikitas  Greece
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@Jeff Thanks,

@marce like?
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Old 20th September 2013, 10:03 PM   #7
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A linear supply will be more reliable, less noisy, safer and simpler.

I have designed both and for audio prefer linear supplies.
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Old 21st September 2013, 09:28 AM   #8
marce is offline marce  United Kingdom
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Disagree, on all counts.
There is no evidence to support, either design if done correctly is safe, not noisy and reliable. By the same token both done badly are noisy (at least an SMPS's noise is outside the audio spectrum), unsafe and not reliable.
It is a generalisation that does not carry any weight.
Even Mr Pass is using SMPS's in his gear as are many others.

If you want to design a SMPS pick a decent chip from the likes of Texas or Linear, and you will find plenty of guides showing you how to design it and more importantly lay it out. There are plenty of app notes on how to do SMPS's, there is a thread on this sub forum with a whole host of articles on EMC and noise control for SMPS's and if you want more information I have tons of it and advise people on SMPS layout and do SMPS layout for critical equipment.
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Old 21st September 2013, 10:02 AM   #9
Nikitas is offline Nikitas  Greece
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@ hi Nigel, thanks for the reply. I don' t doubt your experience, it's just a matter of curiosity. I already have a complete linear psu to try, but I want to compare the results with those that a smps will give.

@ marce, at this point I don' t have the time needed to build one from scratch. That's why I'm looking for a ready made.
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Old 21st September 2013, 10:32 AM   #10
Calvin is online now Calvin  Germany
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Hi,

disagree also with Nigel.
From crap to excellence is all possible with linear supplies or with SMPS.
SMPS have the advantage though that they don´t create noise within the audio band and that due to the high swtching frequnecies and noise spectrum filtering measurents may be lower valued and considerably more compact, efficent and cost efficient.
Since the output voltages are of SMPS are fairly constant a gyrator suffices -see for example Keantokens excellent CFP-Gyrator- to clean up the supply rails and to provide for etremely low output impedance.
A linear supply requires more effort in this regard.
I wouldn´t recommend building a own SMPS if power line voltages are involved but to chose off-of-the-shelf SMPS.
See the excellent Funk SMPS 14T (+-200mA), or 24T (up to 600mA). They include post regulation and filtering and maybe used as are.
Or XP-Power´s ECL-series (see ECL30UD02) and add post-filtering and/or Gyrator.
Meanwell PD-2515 et al rather ´standard´ supplies (use only with post filtering/gyrator).
If You want to design a POL-supply I´d rather recommend to look for a DC-DC-Switcher (see LT3471 et al) with following regulator stage like e.g. LT3032.

jauu
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