250Volt N-channel mosfets for class d - diyAudio
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Old 15th August 2011, 04:37 AM   #1
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Default 250Volt N-channel mosfets for class d

Hello guys,im searching for some 250V mosfets to use in class D amp. I plan to use +/-120V and i can't find any 250V fets,if someone can help me find some.

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Old 15th August 2011, 07:07 AM   #2
lithoc is offline lithoc  Malaysia
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Old 15th August 2011, 04:12 PM   #3
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250 volts is totally inadequate for this circuit. 300 volts is very marginal. 400 volts would be OK.
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Old 15th August 2011, 09:07 PM   #4
Pafi is offline Pafi  Hungary
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250 V is maybe too low, but 300 V is enough.
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Old 15th August 2011, 10:05 PM   #5
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250V is quite low as I presume your using a half bridge and therfore your rails can be 'pumped' by energy returning from the load so may overvolt.
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Old 16th August 2011, 07:07 PM   #6
MOER is offline MOER  United States
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Default 250v FETs

Use catch and steering diodes at these rail voltages.

300v FETs are marginal on a 240v rail.

Using 400v or 500v FETs basically forces you to use catch and steering diodes.


Zed Audio Corp
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Old 17th August 2011, 06:01 AM   #7
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ok, thanks guys
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Old 24th March 2015, 03:01 PM   #8
Cresnet is offline Cresnet  Germany
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in full bridge output stage, can I use 200V mosfet while I supply the full bridge stage with 260V?

As they are connected in serial, so the 260V is actually at both Fets?
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Old 30th March 2015, 04:15 AM   #9
stewin is offline stewin  Kenya
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irfp 4668pbf but 90+/- use bridge configuration

IRFP4668PBF pdf, IRFP4668PBF description, IRFP4668PBF datasheets, IRFP4668PBF view ::: ALLDATASHEET :::
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