Re: MOSFET ratings



Jon Slaughter wrote:

Does the current rating of a mosfet take into account all maximum
circumstances under normal operating circumstances? e.g., basically if it
says X amps and I run it < 80%X or so will everything be ok? i.e., does it
essentially include the power dissipation in that value too(in the sense
that P_max = X*Rds_ON)?

There's more to power dissipation that that alone if it's switching such as turn
on and off losses during which it's operating in a linear way.

Graham

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Relevant Pages

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    ... Just not sure if I actually need to calculate anything else if I'm running it under "normal operating conditions"? ... I'm just trying to find some decent, but not too derated, mosfetsfor motor control of about 15A but not sure if they can handle the power dissipation but not sure if the max current rating takes that into account or not. ... I do see the max power dissipation on the data sheet but I'm a bit confused at how they got it: ... And the marketing glitz, well, you know. ...
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  • MOSFET ratings
    ... Does the current rating of a mosfet take into account all maximum ... circumstances under normal operating circumstances? ... essentially include the power dissipation in that value too(in the sense ...
    (sci.electronics.basics)