High Voltage Mosfet reccomendations

Zero Cool · 5th August 2010, 12:17 AM

I have a project where I need to draw up to 1.25 amps at 170vdc through a mosfet. I have been staring at data sheets for all sorts of mosfets. but when you start looking at the SOA of these devices. most cant handle 1 amp at 170 volts. I need N-Channel only. any suggestions for something that maybe has a 2 amp SOA at 170-200v?? To-220 preferred but i can make anything work.

Zc

woody · 5th August 2010, 12:19 AM

What will your power disipation be?

Zero Cool · 5th August 2010, 12:24 AM

well I am not sure how to calculate that. just doing the math, at 120vdc and 1.15a it is 140w but this is for a PWM switch so it will be run on 170Vdc at 70% duty cycle or less.

woody · 5th August 2010, 12:40 AM

You would probably be better off asking that over on the power supply forum.

Zero Cool · 5th August 2010, 02:00 AM

Oh yeah probably right. I put it in the parts section...

5th August 2010, 12:17 AM	#1
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	High Voltage Mosfet reccomendations I have a project where I need to draw up to 1.25 amps at 170vdc through a mosfet. I have been staring at data sheets for all sorts of mosfets. but when you start looking at the SOA of these devices. most cant handle 1 amp at 170 volts. I need N-Channel only. any suggestions for something that maybe has a 2 amp SOA at 170-200v?? To-220 preferred but i can make anything work. Zc

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5th August 2010, 12:19 AM	#2
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	What will your power disipation be?

5th August 2010, 12:24 AM	#3
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	well I am not sure how to calculate that. just doing the math, at 120vdc and 1.15a it is 140w but this is for a PWM switch so it will be run on 170Vdc at 70% duty cycle or less.

5th August 2010, 12:40 AM	#4
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	You would probably be better off asking that over on the power supply forum.

5th August 2010, 02:00 AM	#5
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	Oh yeah probably right. I put it in the parts section...

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