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LM5112 GATE DRIVER

eli
Guru 13485 points
Other Parts Discussed in Thread: LM5112

Regarding LM5112, would like to know whether it is possible to use it as a high-side MOSFET driver in a synchronous buck converter by connecting the VEE pin to the switching node while the VCC pin is powered through a diode from an external LDO and also connected through a bootstrap capacitor to the switching node (see attached figure).

 

  • 0
    Guru 22270 points

    Hello Eli,

    Can you try to attach the figure again?  I don't see it posted.

    Thanks,

  • 0 in reply to Greenja
    Guru 13485 points

    Hi,

    see below

  • 0 in reply to eli
    TI__Intellectual 2320 points

    Hello Eli,

    The schematic which you have included looks correct with the VEE pin connected to the SW node. The boot diode and the boot cap has been rightly placed between the VCC and VEE pins.  You can use the LM5112 as a high side driver, provided you connect the VEE pin to the IN_REF pin externally. You also need to make sure that the input signal to the driver at the IN pin is referenced here to the VEE pin (switch node here) as well.

    Thanks