250Volt N-channel mosfets for class d

[ionutzxpo]

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]

https://ec.irf.com/v6/en/US/adirect/ir?cmd=catSearchFrame&domSendTo=byID&domProductQueryName=IRFB4229PbF

 

[sawreyrw]

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

 

[Pafi]

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

 

[kipman725]

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]

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

 

[ionutzxpo]

ok, thanks guys

 

[Cresnet]

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?

 

[stewin]

irfp 4668pbf but 90+/- use bridge configuration

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

 

[stewin]

may be try irfp4768

 

[Pafi]

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?

You must be joking. Yes, you can connect 260 V - as long as amp is not operating. Do you understand what switch mode is? ... Try to think about the very very basics of ClassD amps!