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FET turn on with LM5050-1, LM5060 or UCC27531

Luis Cordova
Intellectual 1930 points
Other Parts Discussed in Thread: LM5050-1, LM5060, UCC27531, LM9061

Hello,

When would I want to use the LM5050-1 ORing high-side controller instead of a gate driver or LM5060?

The FET will be pushing 8A continuously, so it will take a considerable amount of current to charge the gate.

To my understanding, if the FET is being used as a switch and switches power from a supply to a load, the ORing controller may work best, especially if FET turn on time is not important. It has the internal charge pump which keeps the FET on.

On the other hand, the UCC27531 can source more current to charge the gate, useful when FET turn on time must be fast, but will require some external biasing circuitry to hold the FET ON.

The LM5060 would fall into the same camp as the LM5050-1, and would be best if more protection circuitry was necessary when being powered by an 'unclean' power supply.

So in the situation where timing was not critical, would the best and easiest to implement be the LM5050-1?

Thanks!

  • 0
    TI__Genius 12380 points

    Hi Luis,

    What voltage range is the application?

     

    The LM5050 does not switch off power from the supply to the load using the OFF pin. This is because it is an ORing controller, so the IN is the source of the MOSFET and OUT is the drain. When the LM5050 turns off the MOSFET, current will still conduct through the body diode of the MOSFET.

     

    Thus for this application, LM5060 may be a better choice and offer additional protection features. I'm unfamiliar with the UCC27531, I believe it is handled by the "AC/DC and Isolated DC/DC Power Forum".

     

    Thanks!

    Alex

  • 0 in reply to Alex Triano
    TI__Intellectual 1930 points

    Hi Alex,

    Thanks for supporting here.

    The supply voltage is 24V. Another option I just found is the LM9061. This seems like a good option to me. Fewer pins, about the same amount of external components, and cheaper.

    Thanks again!