Author Topic: Going over rated Power Dissipation of MOSFET  (Read 284 times)

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Offline help_me_pick_username

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Going over rated Power Dissipation of MOSFET
« on: November 08, 2019, 02:46:16 am »
I have a 30N06l which is rated for a power dissipation of 79w. If I have adequate cooling, can I dissipate more heat with the MOSFET?
 

Offline ejeffrey

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Re: Going over rated Power Dissipation of MOSFET
« Reply #1 on: November 08, 2019, 04:53:08 am »
79 W is only with the case at 25C -- i.e., perfect heat sinking.  Unless you have chilled water cooling you aren't going to be able to even reach 79W.
 
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Offline wraper

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Re: Going over rated Power Dissipation of MOSFET
« Reply #2 on: November 08, 2019, 05:14:14 am »
Under realistic (good) cooling don't push more than 30W out of it if you want to have any reliability. And by good I mean either actively cooled with fan or just HUGE heatsink.
« Last Edit: November 08, 2019, 05:15:50 am by wraper »
 
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Offline viperidae

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Re: Going over rated Power Dissipation of MOSFET
« Reply #3 on: November 08, 2019, 06:12:14 am »
You'd need a heatsink at -15 degrees to run at 79W. The case to heatsink thermal resistance is 0.5C/W, so to keep the case at 25C the heatsink needs to be 79*0.5C lower.
 
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Offline help_me_pick_username

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Re: Going over rated Power Dissipation of MOSFET
« Reply #4 on: November 08, 2019, 12:17:17 pm »
Two broken 30N06Ls later, here we are. Thanks for the info guys, at least I learnt some more about how to read a datasheet properly.
 

Offline T3sl4co1l

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Re: Going over rated Power Dissipation of MOSFET
« Reply #5 on: November 09, 2019, 06:03:26 am »
For how long? >:D  (Datasheet also tells: see safe operating area curve, with times given.)

Tim
Seven Transistor Labs, LLC
Electronic design, from concept to prototype.
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