250Volt N-channel mosfets for class d

ionutzxpo · 15th August 2011, 04:37 AM

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.

Thank You

lithoc · 15th August 2011, 07:07 AM

https://ec.irf.com/v6/en/US/adirect/...me=IRFB4229PbF

sawreyrw · 15th August 2011, 04:12 PM

250 volts is totally inadequate for this circuit. 300 volts is very marginal. 400 volts would be OK.

Pafi · 15th August 2011, 09:07 PM

250 V is maybe too low, but 300 V is enough.

kipman725 · 15th August 2011, 10:05 PM

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.

MOER · 16th August 2011, 07:07 PM

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.

Steve

Zed Audio Corp

ionutzxpo · 17th August 2011, 06:01 AM

ok, thanks guys

15th August 2011, 04:37 AM	#1
ionutzxpo diyAudio Member Join Date: Sep 2009 Location: Romania,Calarasi	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. Thank You

15th August 2011, 10:05 PM	#5
kipman725 diyAudio Member Join Date: Jun 2007 Location: London/N.lincs	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. __________________ CHR-70+Subs

16th August 2011, 07:07 PM	#6
MOER diyAudio Member Join Date: Aug 2003 Location: SIMI VALLEY CA	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. Steve Zed Audio Corp

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15th August 2011, 07:07 AM	#2
lithoc diyAudio Member Join Date: Jul 2005 Location: Seremban2	https://ec.irf.com/v6/en/US/adirect/...me=IRFB4229PbF

15th August 2011, 04:12 PM	#3
sawreyrw diyAudio Member Join Date: Apr 2006 Location: Minnesota	250 volts is totally inadequate for this circuit. 300 volts is very marginal. 400 volts would be OK.

15th August 2011, 09:07 PM	#4
Pafi diyAudio Member Join Date: May 2004 Location: Budapest	250 V is maybe too low, but 300 V is enough.

17th August 2011, 06:01 AM	#7
ionutzxpo diyAudio Member Join Date: Sep 2009 Location: Romania,Calarasi	ok, thanks guys

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