We have designed SMPS supply design around MP020-5 IC to get 3.3Vdc @ 0.6A (Input: 110 - 240 Vac).
Currently, we are in pre-compliance stage and facing issue with EFT @ -1KV.
SMPS board is designed to provide power to one controller board. Controller board has RF & Ethernet as the main interface.
When we apply EFT of -1KV on Line & Neutral line, we stop receiving a ping from ethernet interface and it does not get to normal without applying power reset.
I tried many experiments but was not able to find its root cause yet.
Kindly provide your inputs to resolve this issue, as it has become bottleneck for us to pass certification