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Topic: MOSFET questions (Read 2067 times) previous topic - next topic


Yes that is the static dissipation. As mentioned before at the point of switching over it is more than this which is only a problem if you are switching it on and off rapidly like with PWM.

Note that is not a logic level FET and you need a gate voltage of at least 10V to turn it on that hard.


Dec 23, 2013, 09:16 am Last Edit: Dec 23, 2013, 09:31 am by tocpcs Reason: 1
It will be with PWM, so I've gone and got some heatsinks.
To solve the 10V issue, I plan to use some 2n3904 transistors to drive them on / off,  so it'll be 5V on to the base, which will have 12V at it's emitter and the gate of the MOSFET at it's collector..


That will turn the MOSFETs off quickly, but not On quickly.
Steve Greenfield AE7HD
Drawing Schematics: tinyurl.com/23mo9pf - tinyurl.com/o97ysyx - tinyurl.com/q7uqnvn
Multitasking: forum.arduino.cc/index.php?topic=223286.0
gammon.com.au/blink - gammon.com.au/serial - gammon.com.au/interrupts


Define quick?
I'd still get a slow down in speed if I was switching them say fastest 400ms timebase (so 50% duty cycle = 200ms On period)?

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