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ISO5852S: FLT pin problem.

Part Number: ISO5852S

Hi. This is Jaehoon Kim from Seoultech.

During the development of 3-level SRC(Series Resonant Converter), The gate drive continues to fail.

So i want to ask you a question.

Topology : 3-level SRC

Switch : C2M0045170D [CREE/1700V SiC MOSFET] * 2 parallel

when the Output voltage of converter over 1kV, the gate IC  sends the FLT signal. but the Vds and Vgs waveforms of SiC are very good.

After that, the FLT, GND1, and IN+ pin are connected inside the gate IC.

I attached the gate drive schematic, please advise.

if you need any other information, Please ask.

Thanks.