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LM5050-1: Whether the MOSFET can be reversed

Bryan Huang
Intellectual 445 points
Part Number: LM5050-1
Other Parts Discussed in Thread: LM5060

Hi 

My customer wants to use LM5050-1, but MOSFET needs to reverse, For this application, is it ok?

  • 0
    TI__Genius 16305 points

    Hello Bryan,

    LM5060 is the best suited device to drive MOSFET as per your needs and LM5050 would not work here.

    LM5050 is used to replace schottky diodes in ORing applications and automotive battery input protection. LM5050-1 emulates an ideal diode by controlling external N-Channel MOSFET and is oriented in such way that when it is off body diode blocks reverse current and when ON conducts current in forward direction with low forward drop.

    Next, MOSFET is turned off by LM5050-1 by making Vgs 0V: That is connecting Gate to source (IN pin). If the MOSFET is flipped its orientation, then Vgd is made 0V instead of Vgs. This means when off, MOSFET will behave like a voltage follower and will have output voltage = (input - Vth of MOSFET).

    Due to this reason, LM5050 can not drive MOSFETs in other direction.

    However LM5060 is the best suited device to drive MOSFET as per your needs.


    Regards,

    Kari.