Tunelabguy
Full Member level 5
If you connect 30V across drain and source, you will get either 0 Amps (if the gate is OFF) or 1000 Amps (if the gate is ON), which will instantly destroy any reasonable MOSFET. But this is not a condition you should ever see in your induction heater. I assume your circuit has a load in series with the MOSFET. That load will prevent the voltage across the drain and source from ever getting that high, except when the MOSFET gate is OFF. So while you can see 30V across the MOSFET and you can have 4 Amps flow through the MOSFET, you should never see both of these things at the same time.ok means at 4A if Rds it 30mohm P= 0.48W
But what if I connect 30V across drain and source , will this calculation remain same?
So if your load ensures that the current will never be higher than 4 Amps, the MOSFET will never need to dissipate more than half a Watt.