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LMG3410R070: Isolated DC/DC powersupply clairification

Part Number: LMG3410R070


I have been struggeling with an H-bridge built with 4 LMG3410R070. Sometimes I get an fault indication signal and I always get it from the same FET. One of the top once. There is no reason to suspect too high temperature (max 65C seen with IR-camera) or too high current, no more than 4A. I therefore wonder if there could be something wrong with my powersupply.

I have used 1 RKZ-2512S for each LMG3410R070 due to layout situations. They are decoupled on the GAN side with 2*10uF + 100nF as well as decoupling close to the GAN fet in accordance with the datasheet.

I have not yet added a 18V zener protection. The components are ordered (what would by the way be a suitalble protection zener?)

I would also be interested if someone could shed some light to the following line from the LMG3410R070 datasheet

" Minimizing the inter-winding capacitance of the isolated power supply or transformer is necessary to reduce switching loss in hard-switched applications."

I don't believe i have high switching losses as i cant seen any high temperatures. but could this perhaps be the cause of the problem i am seeing and if so, can you point me toward a more suitable isolated DC/DC supply

Best regards