I'll probably stick relays in with it - MOSFET, and when the load is greatest, I'll use the relays.
When do MOSFETs produce the greatest heat ? I recall reading somewhere that when switching (i.e. not fully on), they get their hottest - is that right?
If it fails you simply need to be lucky lolHow much power is being disapaited ? I was thinking maybe a sense resistor to determine if the fet is still behaving, by enabling, disabling you can measure the voltage drop via a sense resistor and if nothing changes signal a warning.
A thermistor can't be connected to the MOSFET, now can it..
8A x 14V is 112W
Let me check this is right..8A x 14V is 112W112W x 0.45 deg C/W Junction to Case is 50.4 deg C.50.4 deg C + 30 deg expected ambient is 80.4 deg.80.4 deg C is less than the datasheet Operating Junction Max Temp of 170 deg C.It's Junction to Ambient is 62 deg C/W.No heatsink needed - or have I got it completely backwards?
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