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Old 8th February 2011, 11:30 AM   #1
405man is online now 405man  Scotland
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Default One large or many small capacitor

I have been looking at linear power supply design and have noticed that many amplifiers now use multiple parallel capacitors where as previously a single large capacitor was used. Apart from the additional PCB required to mount many capacitors are there any disadvantages to this approach. As a quick comparison I have listed the following combinations all of which cost about the same


Type ESR Ripple I Total ESR Total I

10000uF 63V screw 0.018R 13A 0.018R 13A

4 X 10000uF 63V PCB 0.033R 4.4A 0.00825R 17.6A

8 X 4700uF 63V PCB 0.018 4.86A 0.0081R 48.6A

10 X 2200uF 63V PCB 0.15R 2.5A 0.015R 25A


The figures listed are ESR and ripple current.


Which would be the best combination to use to power a 100W amplifier

Stuart
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Old 8th February 2011, 11:36 AM   #2
AndrewT is offline AndrewT  Scotland
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I would be tempted to go for max uF/. That would be 4off 10mF
For comparison what is the price of two 22mF 63V caps? and what is it's ripple capacity?
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Old 8th February 2011, 12:03 PM   #3
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Quote:
Originally Posted by 405man View Post
8 X 4700uF 63V PCB 0.018 4.86A 0.0081R 48.6A
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Old 8th February 2011, 01:31 PM   #4
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Many, many threads on this:

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