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OUPower.com Discussion Board for Over Unity Power Research 2006-12-26T05:16:26-04:00 https://www.oupower.com/phpBB/feed.php?f=10&t=1237 2006-12-26T05:16:26-04:00 2006-12-26T05:16:26-04:00 https://www.oupower.com/phpBB/viewtopic.php?t=1237&p=11184#p11184 <![CDATA[MOSFET rated at 20A gets hot at 6A.]]> Statistics: Posted by Danberman — Tue Dec 26, 2006 5:16 am

]]> 2006-11-21T01:28:46-04:00 2006-11-21T01:28:46-04:00 https://www.oupower.com/phpBB/viewtopic.php?t=1237&p=10525#p10525 <![CDATA[MOSFET rated at 20A gets hot at 6A.]]>
Using PWM is the problem. As the FET turns on and off it momentarily dissipates a lot of heat. If your PWM frequency is too high, then this switching happens a lot more than it should, meaning your FET heats up.

I had a similar problem back in my racing car days, we had a fan that was controlled by a dashboard computer with three different speed settings. I had to lower the frequency to around 5 Hz to keep the FET block cool.

What you need to do is lower the switching frequency. This should solve the problem.

Statistics: Posted by nebbian — Tue Nov 21, 2006 1:28 am

]]> 2006-11-19T21:05:18-04:00 2006-11-19T21:05:18-04:00 https://www.oupower.com/phpBB/viewtopic.php?t=1237&p=10494#p10494 <![CDATA[MOSFET rated at 20A gets hot at 6A.]]> Statistics: Posted by olympios — Sun Nov 19, 2006 9:05 pm

]]> 2006-11-19T11:07:20-04:00 2006-11-19T11:07:20-04:00 https://www.oupower.com/phpBB/viewtopic.php?t=1237&p=10485#p10485 <![CDATA[MOSFET rated at 20A gets hot at 6A.]]> Statistics: Posted by Bob Boyce — Sun Nov 19, 2006 11:07 am

]]> 2006-11-19T10:21:32-04:00 2006-11-19T10:21:32-04:00 https://www.oupower.com/phpBB/viewtopic.php?t=1237&p=10483#p10483 <![CDATA[MOSFET rated at 20A gets hot at 6A.]]> Statistics: Posted by Nick — Sun Nov 19, 2006 10:21 am

]]> 2006-11-19T08:55:36-04:00 2006-11-19T08:55:36-04:00 https://www.oupower.com/phpBB/viewtopic.php?t=1237&p=10480#p10480 <![CDATA[MOSFET rated at 20A gets hot at 6A.]]> Statistics: Posted by Looking In — Sun Nov 19, 2006 8:55 am

]]> 2006-11-19T08:51:24-04:00 2006-11-19T08:51:24-04:00 https://www.oupower.com/phpBB/viewtopic.php?t=1237&p=10479#p10479 <![CDATA[Re: MOSFET rated at 20A gets hot at 6A.]]> Statistics: Posted by Looking In — Sun Nov 19, 2006 8:51 am

]]> 2006-11-19T07:44:13-04:00 2006-11-19T07:44:13-04:00 https://www.oupower.com/phpBB/viewtopic.php?t=1237&p=10478#p10478 <![CDATA[MOSFET rated at 20A gets hot at 6A.]]> Statistics: Posted by olympios — Sun Nov 19, 2006 7:44 am

]]> 2006-11-19T07:42:33-04:00 2006-11-19T07:42:33-04:00 https://www.oupower.com/phpBB/viewtopic.php?t=1237&p=10477#p10477 <![CDATA[MOSFET rated at 20A gets hot at 6A.]]> I'm using a PWM with a MOSFET rated at 20A, my system pulls 6A but the MOSFET gets hot in about one minute of operation. It is installed on a big heatsink and I can't hold my finger on it for more than two seconds.
Thanks.

Statistics: Posted by olympios — Sun Nov 19, 2006 7:42 am

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