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LM5109B: Application

Can Zhang
Prodigy 70 points
Part Number: LM5109B

What values of gate resistance should we choose for our application?

Besides, is there any recommend model of diode that is antiparallel with gate resistor?

  • 0
    TI__Mastermind 20950 points

    Hello Can,

    The values of gate resistance varies depending on the application desired switching times, parameters of the MOSFET (Qg) and other considerations including power device Vds dV/dt. In general in low frequency applications such as motor drive the gate resistance can vary from 10 to 30 Ohms to target reducing EMI. In power converters the gate resistance is usually much lower to reduce the switching times.

    A good application note for some guidance on selecting gate resistance can be found here:

    http://www.ti.com/lit/an/slla385/slla385.pdf

    Confirm if this addresses your questions or you can post additional questions on this thread.

    Regards,