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TPL1401: Dynamic Slew Rate Control of LMG341x

spmcv
Prodigy 140 points
Part Number: TPL1401

Would the TPL1401 be adequate for dynamically controlling the RDRV current mirror of the LMG3410 GaN FETs?

  • 0
    TI__Guru 52663 points

    Hi, my colleague, AK will be able to provide a more complete answer, but I will give this a shot.

    My understanding is that this must shunt current to GND. The TPL1401 is great for the ratiometric division of a value, but in this case, I do not think you will be able to control the slew rate.  You should consider the TPL0501-100.

    Thanks,

    Paul

  • 0 in reply to Paul_Frost
    Prodigy 140 points

    Paul_Frost said:

    My understanding is that this must shunt current to GND. 

    Yes. Per TPL1401 datasheet:

    Features:

    • FB pin for precision current sink applications

    Isn't that the whole point for using this over a DAC? Figure 6-34 in TPL1401 shows sinking a load current.

    If I'm mistaken, could you run by AK a possible solution like Circuit D with DACx3401 as described in the app note.

  • 0 in reply to spmcv
    TI__Mastermind 18546 points

    Hi,

    TPL1401 can sink current up to 10mA. Having said that, in this application, we need to really know the value of incoming current into the RDRV pin of LMG3410 which is missing in the datasheet. Also if the RDRV is sensitive to any parasitic capacitance or inductance we need to know that as well.

    Also please keep in mind that we will have power on delays for TPL1401 to set the voltage. We need to assess these constraints before going ahead with TPL1401.

    Regards,

    AK