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Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
I know that pretty much all semiconductor devices have turn on/off delays and recovery times, but what happens exactly when you run them faster than that? Do they just heat up? And if so, why do they heat up?
Registered Member #3888
Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
yes, they heat up, and in the case of diodes, even stop functioning properly. for mosfets, if they don't have adequate time to recover, i think all the energy from the gate capacitance and miller effect capacitance gets turned into heat from the Rds on resistance. For diodes, they kind of drift away from even behaving like a diode, and instead appear as a series resistance in the circuit.
of course this is a very vague description because i am no expert on semiconductor behavior, but i was just reading about those effects here: it gave nice descriptions of how components function (or fail to function) in smps circuits
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What happens when you exceed the turn on/recovery/ time of a mosfet/igbt/diode whatever?
