Hi,
the ripple current is responsible for most of the heating in a smoothing capacitor.
The ripple rating varies with ambient temperature. Keep your capacitors COOL. Locate then away from hot heatsinks/sources and provide ventilation.
You can use PSUD11 to investigate the ripple current in your proposed application, but do try to use as little of the permitted rating as possible.
Multiple parallel caps offer a solution to high ripple currents but have other downsides and a few upsides.
the ripple current is responsible for most of the heating in a smoothing capacitor.
The ripple rating varies with ambient temperature. Keep your capacitors COOL. Locate then away from hot heatsinks/sources and provide ventilation.
You can use PSUD11 to investigate the ripple current in your proposed application, but do try to use as little of the permitted rating as possible.
Multiple parallel caps offer a solution to high ripple currents but have other downsides and a few upsides.
Useful tool for power supply design
this will give you an idea of what ripple-current rating your caps will need
http://www.duncanamps.com/psud2/index.html
this will give you an idea of what ripple-current rating your caps will need
http://www.duncanamps.com/psud2/index.html
AndrewT said:You can use PSUD11 to investigate the ripple current in your proposed application...
That confused me and Google. PSUD-Latin 2 as per bremen nacht's link?
All caps have a finite resistance. Typically it is called ESR - equivalent series resistance. The power loss is I^2 * R and the power heats up the cap. The temperature rise is a function of the thermal resistance (from the cap hot spot to the surrounding air) and the life of the cap is strongly related to it's hot spot temperature. So, in general, lower ESR make for longer life.
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