The 22MHz can be resonance between the MOSFET Coss and the trace inductance (incl.
you DO have large DC link cap right? and it is physically located very close your mosfet phase leg, not far away in your double pulse test box or something. you show 0.33 but i think this is your snubber. Oh, i was wondeirng about yoru DC link cap. Your schematicc is perfect, i just like to double check. You get the same crappy waveform on all gate drivers? hopefully yes so you know it is more likely a design problem or a measurement problem. well, you can use two probes so long as the other is diff probe, but don't do that for not make sure you using only one probe to limit possible source of problems. this should be the ONLY ground purposely connected between scope and board. now you can use your regular probe on the lower gate/source and you can clip your prove ground pin right to the mosfet source pin. mosfet source) to digital ground by soldering a wire.
#Autotrax leasing driver#
your power supply for that gate driver i think it doesn't matter if you do the same. so your opto still works is just not isolated. you are looking for some sort of PIE network resonance.Īnother test you can do, carefully and only if you understand what i'm about to say, remove the isolation of the lower gate drive and tie digital ground to power ground.
if not clean then you know problem not in the mosfet or noise coupling through mosfet to your gate drive. this is tested without the double pulse setup, here you are just charing and discharging a cap. cap value to be about the same as your effective gate capacitance. Remove your mosfet and put a capacitor there instead.
#Autotrax leasing how to#
this is hard to explain how to resolve this confusion, but i get the sense you are not new to electronics so probably you know of this already. it might not be real, or it might be real but only appear when you connect your probe (your probe has capaccitance after all).
22MHz is pretty high, its like a resonance.
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