Higher diode forward voltage may be a problem.

Posted by Al Sekela (A) on October 20, 2006 at 22:09:13

In Reply to: higher forward voltage...... posted by beto1 on October 19, 2006 at 18:21:22:

See figure 7a in the linked NASA report (a pdf file).

Substituting a silicon carbide Schottky in place of a silicon p-n junction diode will reduce the output voltage of the rectifier bridge, and the output voltage of the filtered supply. For tube B+ supplies, the difference of about a volt will be unimportant, but for a tube filament supply, the reduction may starve the tube.

Substituting a silicon Schottky will increase the output voltage slightly. This should not shorten the tube filament life, but should be checked to be safe.

The silicon carbide Schottky diodes are best used in higher voltage circuits because of this forward voltage issue.

NASA report on silicon carbide and silicon Schottky diodes. (Open in New Window)

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Follow Ups Full Thread

Topic - CREE vs IR - beto1 19:07:36 10/17/06 (12)

Silicon carbide versus silicon Schottky - Al Sekela 21:29:03 10/17/06 (11)

Re: Silicon carbide versus silicon Schottky - beto1 04:34:00 10/18/06 (10)

Then I would go with the silicon device. - Al Sekela 08:31:03 10/18/06 (9)

Re: if Sic Scottky are not in the limit - beto1 19:28:55 10/18/06 (7)

No obvious physical reason for a sonic difference, - Al Sekela 10:04:32 10/19/06 (6)

higher forward voltage...... - beto1 18:21:22 10/19/06 (3)

Higher diode forward voltage may be a problem. - Al Sekela 22:09:13 10/20/06 (2)

Re: Higher diode forward voltage may be a problem. - beto1 08:46:51 10/21/06 (1)

Here is where I run out of ideas to help you... - Al Sekela 12:10:51 10/21/06 (0)

Re: No obvious physical reason for a sonic difference, - pkell44 13:17:59 10/19/06 (1)

Re: No obvious physical reason for a sonic difference, - beto1 18:17:42 10/19/06 (0)

Re: Then I would go with the silicon device. - beto1 18:27:10 10/18/06 (0)

Follow Ups

Higher diode forward voltage may be a problem. - Al Sekela 22:09:13 10/20/06 (2)

Re: Higher diode forward voltage may be a problem. - beto1 08:46:51 10/21/06 (1)

Here is where I run out of ideas to help you... - Al Sekela 12:10:51 10/21/06 (0)

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