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Old 18th May 2010, 06:55 PM   #1
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Default Sugestions needed on power amp schematics to fit these MOSFETs.

I have got some samples of these MOSFETs:
1) Infineon SPW47N60C2 (600V, 47A, 0.07 ohms, COOL MOS POWER TRANSISTOR)
2) Infineon SPW20N60C3 (650V, 20.7A, 0.19 ohms, COOL MOS POWER TRANSISTOR)
3) Microsemi (APT) 1201R2BLL (not sure: 1200V, 12A, 1.25 ohms, POWER MOS7 FREDFET)
I thought of trying them with Legend Stage models.
Any input?
Thanks.
Regards,
Max.
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Old 18th May 2010, 09:14 PM   #2
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From the part number, both Infineon devices seem to be N channel, thus you would want to look at designs using a quasi complimentary output.
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Old 18th May 2010, 09:19 PM   #3
jaycee is offline jaycee  United Kingdom
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These are most likely all switching MOSFETs made for switchmode supplies. I'm not sure if they would be usable in a linear application such as a Class AB amp. They would certainly work, but might give poor results.
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Old 18th May 2010, 11:00 PM   #4
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Default Feedback from Michael (NMOS amp)

I got this feedback from Michael, about N-MOS amp:
Quote:
"for NMOS you can use any N Channel Power Mosfet, it will be working without any problems...its not class D...."
Thanks.
Max.
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Old 18th May 2010, 11:13 PM   #5
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Quote:
Originally Posted by jaycee View Post
These are most likely all switching MOSFETs made for switchmode supplies. I'm not sure if they would be usable in a linear application such as a Class AB amp. They would certainly work, but might give poor results.
I have designed a few amps both quasi and complimentary with switching MOSFETs and had very good results.
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Old 22nd May 2010, 09:07 PM   #6
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Here is Dr. Bora's reply:

Quote:
"I don't think they are very good for amps. Voltages and currents ... OK, but capacitances are to big - likely problems with drive and stability! Sorry, I am too busy for detailed answers."
Thanks.
Max.
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