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ADUM3223 blanking high side for 200uS periodically

Question asked by ZubiSas on Mar 8, 2018
Latest reply on Mar 23, 2018 by RSchnell

 

I am using the ADUM3223 with EPC2012C devices switching at 1MHz.

When rising input voltage of the converter leg above around 13V, the high side driver blanks the output for 200us periodically ( period of kHz). Output pulses are down from 5.0 to around 0. something volts , causing the mosfet to not turn on and the inverter to fail.

I populated another board, and after some OK running time the ADUM failed in similar manner. 

But in open loop tests, i have kept the system running OK for days. 

 

Any idea about any protection / issue which might occurr ? or failure mode of the device? 

Thanks

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