Good Source for Power Supply Caps

Rommager

Member
Joined
Oct 16, 2007
Messages
272
Reaction score
7
Location
Roanoke, Virginia
Hey guys,

I'm checking to see if anyone has a good recommendation for low ESR capacitors for repairing switching power supplies? There's an old Randy Fromm article that talks about replacing them with good, high quality Low ESR caps, but he also refers to outdated Nichicon part numbers. I figured some of the guys here might have some capacitors that are carried through Bob Roberts, Jameco, DigiKey, Mouser, etc; that have been proven to have a good track record for power supply use. Randy mentions TTI, but you have to call them to get the right part ordered. Granted, it might not be a big deal to call them, I just don't want to wait on hold to possibly get a foreign call center rep that's difficult to understand.

The article in question is:

http://www.mikesarcade.com/cgi-bin/spies.cgi?action=url&type=info&page=psrepair.txt

Anyone have any thoughts?

Thanks!
 
Digi Key, but you need to "spec" the parts yourself. IE, they have a bazillion different types and you need to chose the right one for the application.
 
The company I work for specializes in power supply design. Give me the value, footprint and voltage rating you're looking for and I'll see what I can come up with. Sometimes we get samples for free. I may be able to pass some along for the cost of shipping, or tell you where you can get them.
 
The article refers to the following values:

3300uf, 16V, Low ESR (Nichicon part # UVX1C332M)
1000uf, 25V, Low ESR (Nichicon part # UVX1E102M)

The article doesn't specifically say whether the caps used in the switchers are axial or radial leads, but I suspect that it is most likely radial (anyone know for sure?) I haven't opened up any switchers for a while, so I can't remember if it was axial or radial. All I do know that I have some switchers that look pretty bad on a scope, and I want to see if I can just order some replacement caps since I am now building a new parts order for some other projects.

Thanks!

Sean
 
For those values I suspect they are output capacitors. You will probably need a few of each at the minimum. Let me take a look...
 
Panasonic EEVFK0J332Q 3300uF (60mOhms @ 100khz)
Panasonic EEEFK1A102P 1000uF (80mOhms @ 100khz)

Both these parts can be found at Digikey but they are surface mount. See picture attached for reference. You can get creative and bend the leads down if you need to.

The series resistance (ESR) in the older capacitors will be higher. Using components like these will reduce the output ripple or AC component on the DC output voltage.


Hope this helps...
 

Attachments

  • IMG_3839.jpg
    IMG_3839.jpg
    108.2 KB · Views: 10
Back
Top Bottom