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'[EE] Power Supplies Output Capacitors'
2003\12\03@072951 by egnascimento

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Hi all. This is a beginner question.
Why to use at power supply output four 470uF/16V eletrolitic capacitors
instead of one 2200uF/16V capacitor?

Thanks in advance,
Eduardo Garcia


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2003\12\03@075518 by Mike Harrison

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On Wed, 3 Dec 2003 10:25:58 -0200, you wrote:

>Hi all. This is a beginner question.
>Why to use at power supply output four 470uF/16V eletrolitic capacitors
>instead of one 2200uF/16V capacitor?
>
>Thanks in advance,
>Eduardo Garcia

Mostly fo get lower impedance (ESR), and therefore lower ripple, especially in switchmode supplies.
If the 470 and 2200 caps have the same impedance, then using the 470s will reduce the ESR by a
factor of 4, and may be cheaper than using a single low-ESR 2200 cap. In practice, ESR of larger
values is often higher, so the improvement may be more than 4x

Other reasons might include part availability/cost and shape/size limitations.

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2003\12\03@100358 by Herbert Graf

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> Hi all. This is a beginner question.
> Why to use at power supply output four 470uF/16V eletrolitic capacitors
> instead of one 2200uF/16V capacitor?

       Can't think of any specific reasons off hand, that would depend on your
circuit, but general reasons may be cost (4 470's might be cheaper then one
2200), availability (2200s might not be as common and easy to get in some
areas of the world then 470s), reducing ESR, increasing redundancy
(electrolytic caps are usually the first thing to go in a circuit, having 4
smaller caps might increase the chances of seeing recognizable symptoms
before bad things happen). I'm sure there might be other reasons, but
nothing really big in my mind. TTYL

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2003\12\03@145536 by gtyler

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From Sam Young Cap. data book: 470u 16V LXV esr = 0.12R. 2200u 16v LXV
esr = 0.039R. Therefore esr for 4 x 470u = 0.12/4 = 0.03R, about 75% of
the esr of a 2200u. They probably could not get the 2200 caps at the
time.

George

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