Work out mosfet power dissipation instantly with clear inputs, formula shown and shareable results.
MOSFET loss has two parts: conduction loss I squared times Rds(on), and switching loss equal to the energy lost per transition times the switching frequency. Low frequency designs are dominated by conduction, high frequency ones by switching, and the balance decides whether to pick a low-Rds or low-charge device.
MOSFET losses
P = Id^2 x Rds(on) + Esw x fsw
Electrical results are planning estimates only. Verify against the applicable wiring rules (IEC 60364, BS 7671, NEC or local code) and have all installation work designed and checked by a qualified electrician.
Because switching loss grows linearly with frequency while conduction loss does not change, so gate charge and transition speed dominate above a few hundred kilohertz.
Hot. Rds(on) typically rises 30-80% from 25 to 100 degrees C, so use the datasheet value at the expected junction temperature.