ADuM2401 Vdd1 pull down the supply power during surge test.


I use ADuM2401 for the isolation  between the meter IC (Cirrus 5490 ; before the bridge diode) and secondary side MCU.

I found out that the Vdd1 (Secondary side) will pull down the 3.3V and cause the MCU shunt-down during the surge test (4KV, from AC inlet)

I removed the ADuM2401 and re-apply the surge test and the 3.3V works fine. Hence, I assume ADuM2401 Cause this fail.

Is there any way to solve this issue and what's the root cause of this issue ??

Hear from you soon and thank!!

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