I am using GaN FET's and Silicon carbide diodes in a buck converter simulation in LTSpice. The current through them should be just above 3A, but when I view the waveforms I actually see some ringing on them. The buck converter is hard-switched, but I thought that with these new devices the ringing wouldn't be so bad because there aren't reverse recovery effects in the FET or diodes. My efficiency is still really good, however the current ratings of the devices are exceeded during these switching instants. The FET is blue trace, and SiC diode is the green trace.
Should this be expected? If so, can anyone recommend some low-loss ways to reduce the ringing to acceptable levels?
Should this be expected? If so, can anyone recommend some low-loss ways to reduce the ringing to acceptable levels?
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