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LM5177: LM5177 with GaN device

user5956241
Intellectual 565 points
Part Number: LM5177
Other Parts Discussed in Thread: LMG1205

Hi Tier,

May I know the LM5177 can work with eGaN EPC2071? if yes, furthermore, how to design gate circuit for crosstalk and di/dt effect? 

  • 0
    TI__Mastermind 18805 points

    Hello John,

    Thanks for reaching out to us via e2e.

    The LM5177 is using Logic level gate drivers. Therefore you cannot connect the EPC2071 directly to the outputs of the LM5177.

    External gate drivers will be needed for that purpose.

    Please note, that the LM5177 provides Logic Level outputs (which are referenced to GND and not to the switch nodes) for the High side FETs as well.

    This makes it much easier to connect the external Gate drivers for the High side FETs because these drivers can also be referenced to GND. 

    Best regards,

    Harry

  • 0 in reply to Harry Hofner
    Intellectual 565 points

    Dear Harry,

    thank you for reply.

    could you help us to advise external Gate drivers between LM5177 and EPC2071?  Is the LMG1205 being ok design on here?

  • 0 in reply to user5956241
    TI__Mastermind 18805 points

    Hello John,

    I am sorry, but I am not familiar with the gate driver products. 

    Please have a look at the selection guide on our website:  Gate drivers product selection | TI.com 

    If necessary, please open a separate thread with a gate driver product number in the subject, to make sure that this will be routed to the experts for these parts.

    Thank you so much.

    Best regards,

    Harry

  • 0 in reply to Harry Hofner
    Prodigy 230 points

    Hi John, Hi Harry

    Im also designing a circuit with this controller and i choose it beause it has logic level outputs. Since most GaN devices have a -5V to 6V U_GS_MAX there should be no issue in using GaN as a switch here. If you want to be extra safe you can place something lik a a tiny 5,6V Zener between HB and SW. If you realy need a GaN I would give it a try but I think there are also plenty "Normal" Mosfets that would do the job and require less tweeking. 

    Regards Theo

  • 0 in reply to Theo Keinarth
    TI__Mastermind 18805 points

    Hello Theo,

    Thanks for sharing this information.
    I am closing this thread now. As mentioned before, if necessary, please open a separate thread with a gate driver product number in the subject, to make sure that this will be routed to the appropriate experts.

    Best regards,
    Harry