Big 80A MOSFET (TO-264) for Zen?

Kashmire · 2nd January 2004, 10:42 PM

I've got about twenty of these. Think they'll work well in a Zen?

Ixys IXFK80N20. Capable of 360 Watts. I'll probably run it at standard Zen currents, though.

If nothing else, it will probably last longer before it self-destructs.

http://www.ixys.com/97523.pdf

Tony Salsich · 3rd January 2004, 12:34 AM

The first thing that comes to mind is the high gate capacitance of this device, and what it might mean to the design. Not necessarily a problem, but worth considering.

usekgb · 3rd January 2004, 12:39 AM

This sounds like something fun to try. Keep us posted.

Cheers,
Zach

Nelson Pass · 3rd January 2004, 01:11 AM

Probably will act a lot like 4 IRF240's in parallel. It will work
fine, but the high frequency distortion will be quite a bit higher
unless you lower the impedance of the input/feedback networks
accordingly. Feeling like a 200 ohm input impedance?

Kashmire · 3rd January 2004, 03:27 AM

Yowch! I can get about 320 Ohms output impedance from my 6c45pi driver tube and 4:1 interstage transformer ... that may be pushing the limit ... (sorry for entering tubes into this discussion, but I have a driver stage here on my desk)

Well, since I've got a stack of 80N20s, I might as well try 'em.

Since it seems that Pass is lurking, I'll toss this one onto the ring. If I use a driver stage with voltage gain, I can remove the voltage gain from the MOSFET. Therefore, I can use the 80N20 in follower configuation with unity voltage gain. Any advantages?

2nd January 2004, 10:42 PM	#1
Kashmire diyAudio Member Join Date: Dec 2003 Location: Midwest	Big 80A MOSFET (TO-264) for Zen? I've got about twenty of these. Think they'll work well in a Zen? Ixys IXFK80N20. Capable of 360 Watts. I'll probably run it at standard Zen currents, though. If nothing else, it will probably last longer before it self-destructs. http://www.ixys.com/97523.pdf

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3rd January 2004, 12:34 AM	#2
Tony Salsich diyAudio Member Join Date: Dec 2003 Location: Cold country (Wisconsin)	The first thing that comes to mind is the high gate capacitance of this device, and what it might mean to the design. Not necessarily a problem, but worth considering.

3rd January 2004, 12:39 AM	#3
usekgb diyAudio Member Join Date: Feb 2003 Location: Salt Lake City, UT, USA	This sounds like something fun to try. Keep us posted. Cheers, Zach

3rd January 2004, 01:11 AM	#4
Nelson Pass The one and only Join Date: Mar 2001	Probably will act a lot like 4 IRF240's in parallel. It will work fine, but the high frequency distortion will be quite a bit higher unless you lower the impedance of the input/feedback networks accordingly. Feeling like a 200 ohm input impedance?

3rd January 2004, 03:27 AM	#5
Kashmire diyAudio Member Join Date: Dec 2003 Location: Midwest	Yowch! I can get about 320 Ohms output impedance from my 6c45pi driver tube and 4:1 interstage transformer ... that may be pushing the limit ... (sorry for entering tubes into this discussion, but I have a driver stage here on my desk) Well, since I've got a stack of 80N20s, I might as well try 'em. Since it seems that Pass is lurking, I'll toss this one onto the ring. If I use a driver stage with voltage gain, I can remove the voltage gain from the MOSFET. Therefore, I can use the 80N20 in follower configuation with unity voltage gain. Any advantages?