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Old 12th December 2010, 11:23 PM   #691
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You are probably right. I have not personally done the measurements.
Just reporting back what friends in the industry are saying.

Having said that, the applications where these failures occured were not at high temps (probably lower than 55 degrees)

Last edited by Melon Head; 12th December 2010 at 11:27 PM.
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Old 13th December 2010, 05:27 AM   #692
EUVL is offline EUVL  Europe
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With 2 caps in parallel for each stage of the PSU, I think the 4A each (total 8A) ripple current of the 105°C caps is a bit tight for an amp which is biased at 4A Class A. I would at least use the 6A ones for the C after the Tx.


Patrick
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Old 13th December 2010, 03:42 PM   #693
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All,

Just wanted to let those in the first transformer buy know that all payments have been received and production will begin at SumR for these. Once complete, we will receive notice and I will post here so that everyone knows they are on thier way. Many thanks to SumR for the support and product.

Dave
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Old 13th December 2010, 04:45 PM   #694
EUVL is offline EUVL  Europe
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I did some more search on caps today and found these quite useful.

Patrick
Attached Images
File Type: png Cap Lifetime 85.png (36.1 KB, 286 views)
File Type: png Cap Lifetime 105.png (38.5 KB, 281 views)
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Old 13th December 2010, 04:49 PM   #695
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There are some more cap types with even better specs, but they seem difficult to get :

http://www.krummer-kondensatoren.de/...11lc_411lc.pdf
http://www.panasonic.com/industrial/..._aec_ts-uq.pdf
http://www.panasonic.com/industrial/..._aec_ts-hc.pdf

Krummer is sold by THEL as audio specials :
Elkos ultra low induktiv


Patrick
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Old 13th December 2010, 07:10 PM   #696
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Hi Patrick could you give some back ground on these graphs.

It looks like for 85 degree caps at 2A and 60 degrees you get 12000 hours of life.
And for 105 degres caps at 2A and 60 degrees you get 100000 hours of life - that's almost an order of magnitude better (ie about 10x better).
This seems to agree with what my friends have been saying about 85 degree caps (crap).

Thanks Patrick for digging this up.
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Old 13th December 2010, 07:29 PM   #697
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The Y-axis is actual ripple current / rated ripple current.

As you can see in catalogs, the rated ripple current for a 105°C cap is quite a bit lower than that of the equivalent 85°C cap, whereas the actual ripple current depends on the application and is thus the same for both cases.


Patrick
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Old 13th December 2010, 07:32 PM   #698
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Thanks Patrick

OK it looks like, for 85 degree caps 50000 hrs at 60 degrees at max rated ripple current (I/I =1)
And for 105 degree caps somewhere between 250000 hrs and 100000 hrs at 60 degrees and max rated ripple current (I/I=1)
So, somewhere between 2 and 5 times better for 105 degree caps at max rated ripple current and same operating temp (60 degrees). This seems about right
And about 8 to 10 times better for 105 degree caps at double max rated ripple current and same operating temp (60 degrees).

Last edited by Melon Head; 13th December 2010 at 07:47 PM.
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Old 13th December 2010, 08:04 PM   #699
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Best 25V TS-UQ with dimensions 30mm x 50mm, 47000uF has 8A ripple current at 85 degrees

Best 25V TS-HC with dimensions 30mm x 50mm, 39000uF has 5.8A max rated ripple current at 105 degrees

Trying to make sense of all of this. Let's say we run both caps at 5.8A at 60 degrees.
That will be I/I=1 for TS-HC and I/I=0.725 for TS-UQ.

So, TS-UQ will give somewhere between 100000 hrs and 50000hrs of life at 5.8A and 60 degress.
And, TS-HC will give somewhere between 250000 hrs and 100000 hrs of life at 5.8A and 60 degrees

Last edited by Melon Head; 13th December 2010 at 08:10 PM.
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Old 13th December 2010, 08:10 PM   #700
massimo is online now massimo  Italy
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New Pana TS caps
The question is: how good are "compact" (-30% in size) caps compared to std sized ones?
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