Hello,
I have designed a circuit which uses LM5069 as hot-swap/inrush limiter.
Circuit works fine, as calculated but i have one major issue:
Whenever power is lost for a short time (fast re-insertion in backplane), the insertion time is not triggered, only inrush period is started.
This is caused by the fact insertion time is triggered whenever the input voltage drops below a threshold (PORit which is about 7V).
But during short power loss, capacitance behind the switch on the board is feeds back to the input supply through the internal body diode of the mosfet, causing very slow decay.
This behavior is not acceptable, since the board supply sequencing is undefined this way.
All supplies should be starting from zero when PG flag is triggered, instead some are now not completely shutdown due to the short power loss + capacitance.
Is there any good solution for me other than placing a series diode behind the mosfet preventing the capacitors to feed back to the input?
The current is quite high in my application which makes this not an efficient solution, i would rather have some additional startup time delay implemented.
Thank you for your help in advance.
