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Most Rugged Switching Power Supply Caps
Most Rugged Switching Power Supply Caps
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Old 7th February 2018, 12:44 AM   #1
DreadPirate is offline DreadPirate  United States
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Default Most Rugged Switching Power Supply Caps

What would be the best, most rugged capacitors to use for a switching power supply? I have the following values of capacitor to replace on the Pioneer SP-SB23. This is a high failure rate unit, despite selling for $400. The capacitors on the SMPS are:

470uF/50V- Sam Young 105F esr measured at .04
100uf/400V- TR JUNZL 105F esr measured at .58
10uF/63V- MHC 85F esr measured at 1.6
47uF/50V- IIPVAN esr measured at .74 and .66

The esr measures fine on all of these, but I get a pop on startup of the soundbar and the bulk cap on the amp right off the power supply board swelled (despite being a panasonic eb series). The caps on the SMPS seem to be junk grade. The nichicon UPJ seem like reasonable replacements, but the ripple does not seem much higher than the existing caps. Is tabulated ripple and esr enough of a criteria or are the name brand caps superior in some other way? Anyway, I wish to recap the board for piece of mind, a suggestion for the best possible caps would be appreciated.
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Old 7th February 2018, 01:23 AM   #2
DreadPirate is offline DreadPirate  United States
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Photo of SMPS.
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File Type: jpg smps-s.JPG (144.3 KB, 221 views)
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Old 7th February 2018, 04:15 PM   #3
AndrewT is offline AndrewT  Scotland
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is there a voltage doubler in there?
400V capacitor is often used in 230Vac SMPS and these use some form of doubler when oprating from 115Vac supply.

If yours does not have a doubler then 400V is way over specified and you don't need to change that.

But if there is a doubler, then the 400V is close to being overloaded. In this case it might be more reliable to use 450V or 500V for that storage capacitor.
It also has a high ripple current imposed on it so you need high ripple capability.
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Old 10th February 2018, 06:15 PM   #4
DreadPirate is offline DreadPirate  United States
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I'm seeing 166V across the 400V cap. This TR JUNZL cap has a RC of 400 at 120Hz with a 2000H life, the Panasonic EE series has RC of 825 and 8-10K life, so I guess I will definitely replace this one, probably the rest also, though they all test well. The 470uF/50V cap is the last filter prior to going to the amp, tests fine with a .04 esr, but I'm not sure I trust a cap named "Sam Young."
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Old 10th February 2018, 06:18 PM   #5
Fast Eddie D is offline Fast Eddie D  United States
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Originally Posted by DreadPirate View Post
but I'm not sure I trust a cap named "Sam Young."
You've never heard of Samsung before?







I've seen these caps too. I really don't know, but I think they have to be fake as hell.
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Old 10th February 2018, 06:22 PM   #6
DreadPirate is offline DreadPirate  United States
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Sam Young might be the little brother of Sam Sung. Both cousins to Wee Too Lo. Pretty sure they are not "fake," but genuine Sam Young.
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Old 11th February 2018, 07:31 AM   #7
Fast Eddie D is offline Fast Eddie D  United States
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Sam Young might be the little brother of Sam Sung. Both cousins to Wee Too Lo. Pretty sure they are not "fake," but genuine Sam Young.
I know they are genuine Sam Young. My esteemed colleague Sum Ting Wong confirmed that they are indeed a legit company.
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Old 11th February 2018, 08:18 AM   #8
abraxalito is offline abraxalito  United Kingdom
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Samyoung caps rock in terms of bang for the buck - very hard to beat measurement-wise (ESR in particular). I heard somewhere they're the Korean branch of Nichicon though I can't find any evidence of that on their website.
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Old 11th February 2018, 02:06 PM   #9
Fast Eddie D is offline Fast Eddie D  United States
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Why would a respectable company like Nichicon choose a product name that sounds like a cheesy, half-baked plagiarism? Isn't the marketing department supposed to safeguard against such gaffes?

I'm not saying you're wrong, but it's a fact that when I first saw them I laughed my *** off and immediately drew disparaging conclusions regarding the integrity of the product I was disassembling for parts. Any true marketing egghead would immediately realize this.

On the same token, I'm going to market a bootleg car. I'll call it the Fard Forkus. See how that works?
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Old 11th February 2018, 03:51 PM   #10
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Samwha=Nichicon, Korean made
Samyoung=Nippon Chemi-Con, Korean made
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