I have a issue with the design dual ADM1278 hot swap controller connection as picture below:
The issue is in the case when PSU1 is delivering power to 12V_main and PSU2 doesn't provide power to 12V_main but at the PSU2 side, we measured a unexpected voltage 12V and a fault event (FET health) in HSC2. After debugging, we found that there is a current from 12V_main to PSU2 via body diode at MOSFET Q2.
Could you please explain why HSC2 notificate FET health? and could you suggest the way connection for dual HSC to avoid the current unexpected in that case?
Thank you so much