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LM5050-2: Behavior Explanation During Input Transition

Allan Fan
Expert 6870 points
Part Number: LM5050-2

Hi expert,

Customer used LM5050-2 to ORing DC_48 and BAT_48V. There is a question at DC_48V that when DC_48V was connected, then plug in BAT_48V and remove DC_48V, there is a short period of fluctuation during DC_48V decreasing around 36V. That seems DC_48V is charging and discharging. Is it possible caused by BAT_48V reverse current? Or do you have any idea what would it be? 

Just to clarify, although we see the DC_48V fluctuation during transition at input, the ORing output for system can still normal operation.

DC to Battery issue_TI.PPTX

Regards,

Allan

  • 0
    TI__Guru 57737 points

    HI Allan,

    Thanks for reaching out to us. Let me go through the details and get back to you by tomorrow.

  • 0 in reply to Praveen GD
    TI__Guru 57737 points

    HI Allan,

    DC-DC converters like  Buck converter generally do not sink reverse current like a battery. Because of this reason if a battery with higher voltage is connected at the output of DC-DC converter through ORing controllers, the DC_DC output voltage can rise up (as it cannot sink current) before the ORing controller turns OFF the FET to block reverse current flow.