ke7c2mi
DIIDevHeads IoT Integration Server
•Created by ke7c2mi on 9/9/2024 in #pcb-and-analog
Designing an SDR with PoE Power Supply: Synchronizing SMPS and Managing Heat and Noise
At the lower end of the spectrum I can somewhat get my head around mosfet properties, but when it gets critical I make myself scarce. 12V is a big voltage 😄
That said - I suspect that the other mosfets have more gate capacitance, or need more Vgs to fully switch on.
The extra gate capacitance is a cost of switching energy, it will heat up because you are charging and discharging a capacitor - it will always be there.
Heating from not turning off an on fast enough I thnk would be more load dependant.
@Afuevu can you show the relevant parameters for the mostfets you changed? Gate capacitance and Vgs threshold are I think what matters here. If the gate capacitance of the new mosfet is a lot higher that may do it.
Take anything I say RE electronics with a pinch of salt, backseat HWeng at best
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