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TPS62840: Solar harvesting application, issue w power being removed and load being discharged back thru body diode

Jeff Coletti
Expert 8755 points
Part Number: TPS62840

Hi All

Ran into an issue where in a solar power application, the buck is subject to reverse flow, from output to input when input power is lost. Do we have a device that is ultra low power and has a current block?

Thanks

Jeff Coletti

  • 0
    TI__Expert 3645 points

    Hello Jeff,

    can you give more details about this reverse flow? Did you experienced with this device? In case yes, can you provide me scope plots to better understand what happened? Removing the input the device should go in UVLO and the device will be off.  

  • 0 in reply to Alfonso Furio
    TI__Expert 8755 points

    Hi Alfonso

    If the output is set to 3v and the input drops to 2v current will current flow from the output to the input? 

    Also just to confirm, if the input falls below the UVLO trip point, how does the top fet prevent current from flowing thru the fet body diode? Device can be off, but the diode will still conduct.

    Thanks

    Jeff

  • 0 in reply to Jeff Coletti
    TI__Expert 3645 points

    Hello,

    the device can be in reverse flow with the conditions that you described. To avoid this possibility you can use at the output a load switch or ideal diode. Both are in our portfolio in the power management section.