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Old 18th September 2012, 07:42 AM   #11
luka is offline luka  Slovenia
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Originally Posted by b_force View Post
You are right, it was just an example.

Are there other fets that can drive 500W (or a little bit more) as a pair?
Or is it better to use four fets for better cooling (more cooling surface)
yes, irfb4227 is good start... there are others too, this one is just good to start with, far better then 20y old fets
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Old 18th September 2012, 11:43 AM   #12
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using more fets is a better option but only wen u use a buffer
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Old 24th September 2012, 10:17 PM   #13
b_force is offline b_force  Europe
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Good point.
Old products, or (even worse) absolute products is not an option.

I am trying to find out if I need a buffer.

Is there a real benefit to use the TC4420 instead of twp NPN/PNP pairs?

According to AN-1070, I need a MOSFEt with a BVdss of at least 200V.
Also a low Rds(on) is needed, so the IRFP4668 would be a good choice.
However, the IRFB4127 is cheaper and has a lower Qg
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Last edited by b_force; 24th September 2012 at 10:25 PM.
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