Hi was hoping for a sanity check.

Looking at a FGY75N60SMD IGBT

Driving at 50 Khz, 50% duty, 75A, 311V DC

Was trying to figure heat dissipation in device.

I calculated 236 watts switching loss, and 54 watts of resistance dissipation (call it 300 watts)

Device is rated to 375 watts.

Switching loss is 4.71mJ (x 50,000 cycles/ second) = 236j/sec= 236watts

Resistance loss calculated from Saturation voltage characteristics (fig3 in Fairchild data sheet Rev C2)

R=(deltaV)/(Delta Amps) = 1.4V/146Amps) = 0.0096 ohms

P = I*I*R = 75A*75A*(0.0096) = 54

Have I missed anything besides the obvious need to quench this thing in the Mississippi river??

Thanks,

MB