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LMG1020: Operating frequency

Elisha Tarroza71
Expert 3700 points
Part Number: LMG1020

Hello!

We've been asked by a customer if it's possible to operate LMG1020 at frequencies higher than 60MHz(around 100MHz) because it has very fast rise, fall, and propagation delay times.

From what I know, the maximum frequency that the input can handle is limited by the physical construction of the device and can operate only up to what the datasheet specifies.

I'm unable to ascertain if having fast tr/tf/tpd will mean having higher operating frequencies as, so far, I haven't found a TI document that discusses this.

Could you please advise if it can indeed be used at higher frequencies or share a document if there's any?

Thank you for your help!

  • 0
    TI__Genius 12990 points

    Hi Elisha,

    Thanks for reaching out about lmg1020.

    The switching frequency of this device is limited by the device itself as well as the layout and the Fet.

    The lmg1020 evm will allow you to evaluate the part to the maximum switching frequency.

    Using the lmg1020 evm switching frequencies in excess of well over 60 Mhz can be achieved depending on the pulse width and bus voltage used.

    Please let me know if this helps answer your question or feel free to ask any more questions.

    Thanks,

  • 0 in reply to Jeffrey Mueller
    TI__Expert 3700 points

    Thank you, Jeff! Some more questions though:

    Jeffrey Mueller said:
    The switching frequency of this device is limited by the device itself as well as the layout and the Fet.

    Is it the layout of the PCB? Or the layout inside the IC?

    Jeffrey Mueller said:
    The lmg1020 evm will allow you to evaluate the part to the maximum switching frequency.

    Will it be possible to estimate how much higher from 60MHz can be obtained?

    Thanks again!


  • 0 in reply to Elisha Tarroza71
    TI__Genius 12990 points

    Hi Elisha,

    Thanks for the follow up question.

    The PCB layout should be low inductance not only the power Loop but the Gate Drive loop as well should be low inductance to achieve the highest switching frequency which means placing the driver as close as possible to the gate of the fet.

    We can try to estimate maximum switching frequency of your application by simulating it using the lmg1020 spice model or Tina model.

    Can you send me your schematic and tell me a little bit about the normal operating conditions of your circuit?

    Thanks,

  • 0 in reply to Jeffrey Mueller
    TI__Expert 3700 points

    Unfortunately, I don't have a schematic as we created this thread on behalf of the customer only. Thank you, Jeff. We truly appreciate all the help.