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Re: victor 885 parts
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Originally Posted by Mark McLeod
... There is more to blowing up FETs than their individual ratings. Put too powerful a FET in as a replacement and the rest of the Victor won't be able to handle it. ...
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FET's that are rated for higher breakdown voltage and/or for lower on-state resistance will also have higher gate capacitance. A driver circuit that is correctly sized for a lower-rated FET may not provide sufficient gate current to fully saturate a larger FET within the same switching interval; this would result in higher switching losses, so the larger FET might actually run hotter, depending on the chopping frequency. As Mark says, you should not try to soup-up a Victor by simply changing out FETs -- you have to consider the whole circuit.
[edit]666 posts![/edit]
__________________
Richard Wallace
Mentor since 2011 for FRC 3620 Average Joes (St. Joseph, Michigan)
Mentor 2002-10 for FRC 931 Perpetual Chaos (St. Louis, Missouri)
 since 2003
I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.
(Cosmic Religion : With Other Opinions and Aphorisms (1931) by Albert Einstein, p. 97)
Last edited by Richard Wallace : 21-09-2006 at 16:08.
Reason: eerie
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