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Old 29th June 2006, 05:46 AM   #1
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Default HV Diode Selection

I am putting together a power supply that needs to give about 24mA at about 210V. I happen to have around a 125-0-125 transformer and an EZ81, so I thought I'd use these in conjunction with 2 silicon diodes to make a bridge rectifier. Does anyone have any suggestion of what to look for in terms of diodes to use. Digikey lists lots of D0-41 package ultra-fast diodes that are well over 800V. Does the choice matter beyond this? Any concerns with heat from this package? Anything else to concern myself with with a hybrid bridge?
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Old 29th June 2006, 06:30 AM   #2
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1N4007 (or UF4007) should be plenty beefy.
Of course you can shoot for a higher voltage,current,etc. if it pleases you.
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Old 29th June 2006, 12:14 PM   #3
SHiFTY is offline SHiFTY  New Zealand
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I had a couple of UF4007 go short circuit on me, so I never use them now.

Actually I had much better luck with plain old IN5408. 800V, 3A, what more do you need.
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Old 29th June 2006, 03:08 PM   #4
arnoldc is offline arnoldc  Philippines
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I use FR107 and have not had any failure, so far.
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Old 29th June 2006, 04:16 PM   #5
kevinkr is offline kevinkr  United States
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I've used UF4007 for quite a few years and never had one fail..
Given the rating of the EZ81 this or the 1N4007 ought to be good enough..

The soft turn off/fast recovery characteristic of the tube rectifier imho makes the use of fast silicon diodes unnecessary.

I'd say use whatever you can get at a reasonable cost with a PIV rating of at least 800V to allow for line transients.

I'm not convinced that I have ever heard a real difference between comparable diodes fast or otherwise. In terms of RF noise it definitely does make a difference that can be measured. RC snubbers incidentally can take care of this too, and are good practice for high voltage rectifier stacks regardless of diode type used...

Edits: still learning to spell I guess.. LOL
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Old 29th June 2006, 07:20 PM   #6
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ONSemiconductor MUR4100E (1000V/4A) are rated for reverse avalanche energy - they will withstand huge overvoltage spikes. And I think they're .80 cents apiece...
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Old 10th September 2006, 08:34 AM   #7
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Quote:
Originally posted by Tom Bavis
ONSemiconductor MUR4100E (1000V/4A) are rated for reverse avalanche energy - they will withstand huge overvoltage spikes. And I think they're .80 cents apiece...
Has anyone used these with good results? I've just had a UF4007 failure and looking to use some better parts.

cheers!
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