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Old 10th December 2012, 07:32 PM   #1
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Default Silicon carbide rectifiers in cd clock ps

Has anyone done this? I ask because I am about to use a Tentlabs setup and will modifiy their XO ps with a silicon carbide bridge and was wondering what improvements I may expect. Regards
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Old 10th December 2012, 11:59 PM   #2
qusp is offline qusp  Australia
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none for this application, they often have higher dropout and are not what you would acll a 'soft' diode. no chance they will give lowr noise, which is the only thing important for a clock PSU
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Old 11th December 2012, 12:05 AM   #3
Bigun is offline Bigun  Canada
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don't the Cree SiC rectifiers have very low minority charge storage = clean recover ?
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Old 11th December 2012, 12:16 AM   #4
qusp is offline qusp  Australia
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yeah they offer what they call 'zero recovery' i've used them quite a bit, they are actually nice diodes, but check out Nelson's measurements/comments on zero recovery/sic diodes (i'll see if I can find the link); they can cause a resonance.

the main disadvantage i've found from using them is quite a bit higher diode drop, so if replacing the diodes and diodes only in an existing design, you may find that it doesnt leave enough margin for the regulator. I found that they made what was a properly sized custom wound transformer less than ideal because of this factor.

for an amp of your own design, they may present some advantages, but for a clock regulator I dont see the point.

Last edited by qusp; 11th December 2012 at 12:19 AM.
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