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-   -   Help to choose caps with different ripple current (https://www.badcaps.net/forum/showthread.php?t=100826)

CdDvdFlash 11-13-2021 05:33 AM

Help to choose caps with different ripple current
 
I have a LG RC689D power supply to replace caps but I'm not sure about ripple current values, one cap is 16V 2200uf 105c and I found the two below caps that I'm thinking of getting but do I choose one with a low or high ripple current?

https://au.rs-online.com/web/p/alumi...citors/0374433
and
https://au.rs-online.com/web/p/alumi...citors/7037501

diif 11-13-2021 06:08 AM

Re: Help to choose caps with different ripple current
 
Only one is in stock. Look at the data sheets for the caps you're replacing, they will tell you the ESR and ripple required.

One of the caps you list above isn't in stock.

stj 11-13-2021 09:38 AM

Re: Help to choose caps with different ripple current
 
ripple current should be equal or higher - never lower than what your replacing.

CdDvdFlash 11-14-2021 09:25 AM

Re: Help to choose caps with different ripple current
 
I have looked at the data sheets for two brands "Sam Young" and "Samwha" and I found most of them, the ones below are the ones I found with the ripple current value:

Sam Young:
https://www.samyoung.co.kr/product/p..._miniature.asp

KMG, 25V, 100uF, -55c ~ +105c, +-20%, 6.3mm (diameter) x 11mm (high)
159 rated ripple current (mArms/105c, 120Hz)

KMG, 16V, 100uF, -55c ~ +105c, +-20%, 5mm (diameter) x 11mm (high)
119 rated ripple current (mArms/105c, 120Hz)

KMG, 10V, 220uF, -55c ~ +105c, +-20%, 5mm (diameter) x 11mm (high)
170 rated ripple current (mArms/105c, 120Hz)

NXB, 16V, 2200uF, -40c ~ +105c, +-20%, 12.5mm (diameter) x 20mm (high)
2,360 rated ripple current (mArms/105c, 120Hz)

Samwha:
http://www.samwha.com/electric/produ....aspx?f_num=39

SD, 450V, 68uF, -40c ~ +85c, 16mm (diameter) x 35.5mm (high) but cap is 18mm x 32mm
503 ripple current (mA rms) at 85c, 120Hz

RD, 25V, 1000uF, -55c ~ +105c, 10mm (diameter) x 20mm (high)
820 ripple current (mA rms) at 105c, 120Hz

SD, 10V, 1000uF, -40c ~ +85c, 10mm (diameter) x 12.5mm (high)
659 ripple current (mA rms) at 85c, 120Hz

so would I replace the above caps with the same or higher ripple current eg: 820 RC is 820mA (milli amps) RC?
But what is 2,360 RC? 2.360 amps?

The below caps are the ones I need help to find the ripple current:

Sam Young:

KMF, 16V, 2200uF, 105c, 13mm (diameter) x 20mm (high)

KME, 16V, 2200uF, 105c, 12.5mm (diameter) x 25mm (high)

KME, 25V, 470uF, 105c, 10mm (diameter) x 17mm (high)

SMS, 35V, 33uF, 85c, 5mm (diameter) x 12mm (high)

Samwha:

RG, 10v, 1000uF, 105c, 10mm (diameter) x 17mm (high)

RG, 50V, 47uF, 105c, 6mm (diameter) x 11mm (high)

Someone said to replace all the 10-16 volt caps with 25 volt caps if I do this do I keep the same ripple current or go with something higher but how higher is to high?

PeteS in CA 11-15-2021 12:18 PM

Re: Help to choose caps with different ripple current
 
The NCC KMG series looks to be a high quality 105C general purpose part (and no longer in VCC's catalog?). The Rubycon ZLH series is a very low impedance, long life part. Very different parts for very different applications.

Rather than throwing parts at what you're trying to repair, I suggest understanding how the part you want to replace was used. Maybe start with the manufacturer and series and cross-match that with a similar or slightly better part.


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