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Old 25th November 2016, 01:52 PM   #21
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Hi Andrew,

ok - you're right. Lifetime is 25,000 hrs at 85 deg C at full ripple current or 200,000 hours at lower ripple and temp. Should last for the rest of my life.

How do you do snubbing Andrew? Or do you find it unnecessary?
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Old 25th November 2016, 02:12 PM   #22
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Quote:
Originally Posted by popchops View Post
........

So... I'm currently looking at the EPCOS Sikorel B41570 which I would mount horizontally off the heatsink in a 2U case. 5mOhm ESR and ripple rating off the scale. And lifetime is about a million years which is good because I plan to do this once.

..........
I actualy run the 550 and 560 series from EPCOS TDK , they cost alf the price of the 570 with great result


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Old 25th November 2016, 02:42 PM   #23
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Attaching them to the heatsinks sounds like a very bad idea. Even if they work within specs, there is no justification to put them through such a heat strain.
I would keep them close to the load but as cool as possible.

About snubbers, there is a very nice thread here
Simple, no-math transformer snubber using Quasimodo test-jig
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Last edited by dimkasta; 25th November 2016 at 02:44 PM.
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Old 25th November 2016, 02:46 PM   #24
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sure , the EPCOS dont need any cooling , mine run cool even after hours of use in my F6 amp at full load.


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Old 25th November 2016, 03:14 PM   #25
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my heatsinks will be the case walls... not internal. Not likely to be more that 10 deg above ambient and the caps are rated for 105deg so prob ok.

Just mounted off the walls for convenience not for cooling - it means you can get the 80mm or even 105mm can into a 2U case if you bolt it in horizontally.
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Old 25th November 2016, 03:27 PM   #26
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Default Other options for +/-55V?

Anybody else got a design for +/-55V linear power supply?

Which caps? Any recommended PCBs?
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Old 25th November 2016, 03:43 PM   #27
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Quote:
Originally Posted by fabrice63 View Post
I actualy run the 550 and 560 series from EPCOS TDK , they cost alf the price of the 570 with great result
Can you specify these Epcos series 550/560 better? Couldn't find it with those numbers.
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Old 25th November 2016, 03:50 PM   #28
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I got them at Mouser

http://www.mouser.fr/Search/ProductD...41550E7229Q000

http://www.mouser.fr/Search/ProductD...41560A7339M000

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Old 25th November 2016, 05:02 PM   #29
phase is offline phase  United States
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I sprung for the B41550 for my 300W fet amp, am counting on them lasting a long time, and they do have a tremendous amp rating.
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Old 25th November 2016, 08:19 PM   #30
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The B41550/70 series is awesome. The B41560/80 looks similar except the life is abysmal by comparison. I'm gutted; I thought I could get the B41570 in 22,000uF but now there's minimum order qty of 50.
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