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Topic: Switching ON/OFF High Current Load (Read 2045 times) previous topic - next topic

nuggetchris

#45
Jul 19, 2018, 03:21 am Last Edit: Jul 19, 2018, 03:23 am by nuggetchris
BTW you shouldn't be looking at the current rating, its never as relevant as the on-resistance and the
power rating.  You'd normally never run a MOSFET anything like its full current rating, and here you
have a 3V load so its really important not to, as the voltage drop at max current can be several volts!!

Load is 12V@~75A, not 3V. So generally ~900W. Would the first example you provided still be suitable?

MarkT

You need to do the maths and decide.  The voltage loss is I times R, the power dissipation is I times I times R.

Do the values meet your requirements?
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