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TPS2419: Enable functionality

Akash S
Intellectual 375 points
Part Number: TPS2419

Hi,

Assume

Vbus1 = 12V and Vbus2 = 5V

Case: When EN pin of Vbus1 controller is pulled low 

The load will still see Vbus1 voltage (12V) due to body diode conduction. Is this right?

If yes, what is the exact functionality of the EN pin?

  • 0
    TI__Genius 16305 points

    HI

    When ORing two power supplies of same voltage rail for example, 12V, both can be ON at the same time and supply load current together.

    But for if you need to turn off one rail for any reason, then using EN, will turn off the MOSFET and prevent that rail from supplying power to the load.

    Though body diode conducts small current, it needs output voltage (OR-ed) to go below one diode drop to conduct.

    Let us know if this answers your question.

    Regards,

    Kari.