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Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
You are coupling noise through the drains of each fet to the heatsink. You should find out how to remedy this before you cause your gate drivers to overheat! This is the common mode noise Conner mentioned. Luckily, my big IGBT brick drives dont seem to suffer from this despite not even considering the problem when i designed them.
If those are real you have serous problems
Not really... high dissipation is to be expected at 2.4mhz with common fets. If he is careful about zero current switching with his load, then he should be fine.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
That fuzzy ringy stuff looks like some sort of parasitic oscillation. If it were just ringing excited by the gate drive edges, it would have a decaying envelope. Anyway the acid test is when you connect those FETs to some power and see if the waveforms still look nice when everything is di/dt'ing and dv/dt'ing all over the place like crazy.
Good luck trying to get a low enough inductance layout to work at 2MHz, with your FETs in a row
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isolated gate drives
