I think all the above replies have pretty much covered everything.
That value of capacitance is OK because the SMPS is designed to fully meet its specs under full load using just that value. See below...
This is the important part I was trying to get across at the start. Many SMPS do not like lots of additional capacitance adding. It is detrimental to the overall performance. Small local value decoupling is fine and to be recommended.
----------------------
Something else you might not realise is that you probably come nowhere near to using the full output of the amp. Most listening (at home) is done with just a watt or two.
https://www.diyaudio.com/community/...h-voltage-power-do-your-speakers-need.204857/
Dear Mooly,
Thank you for your reply and to all who helped me on my inquiry that cleared everything.
Decoupling caps is something that im not familiar with and will do a research about it.
Thanks again to all who shared their knowledge with this.
Best N.
Decoupling caps are typically small value caps used to maintain a low impedance across the supply. They are not used to reduce ripple. For an SMPS like you describe something like a good quality 47uF 63 volt with a parallel 0.1uF film cap and series 1 ohm 0.5watt metal film or carbon film resistor is a good option.
Like this across each rail and close to the amp PSU connections.
Like this across each rail and close to the amp PSU connections.
No, conventional power supplies can use a fuse. The conventional supply can supply 3X rated power for 5 seconds without even heating up let alone blow anything. Significantly longer, you blow the fuse. But what it doesn’t do is get “OCD” as JM puts it and make your amplifier misbehave when drawing those repeated surges of high-er-than-average current every few milliseconds.
You can get away with putting the “stability related” bypass capacitors your amp may want (and good practice anyway) because they are relatively small. All SMPSs have an output capacitor - 470 uF is a typical value. It varies all over the place, depending on the design and it’s only happy if it stays near that value. It also tells you what FREQUENCY the output averaging will work down to. If the impedance of that capacitor is low compared to the speaker impedance, the supply will behave as though you were drawing a continuous DC from it at the average value. Short term ”overloads” within this window won’t bother it. An amplifier powered by an undersized switcher may put out full power on speech peaks, but sound like *** and go into limit when the bass drops.