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LM3281: Transient Graphs with 2.2uF Output Cap

John Fedak
Expert 6715 points
Part Number: LM3281

Hi Team,

Good afternoon, my customer is interested in the LM3281 given the use of the small 2.2uF output capacitor. Do we have any graphs of load transient behavior using only the 2.2uF cap?

I noticed on the evaluation board that there is an additional 4.7uF and 10uF cap.

Regards,

~John

  • 0
    TI__Intellectual 1965 points

    Hi John,

    Thank you for your question. I have notified the expert who supports this part. You can expect a response no later than 9/6/18.

    Best,
    Grant

  • 0
    TI__Expert 6330 points
    Hi John,

    I do not have this data on hand. I will set this up on the bench by the end of the week and get back to you.

    Regards,
    Aaron
  • 0 in reply to Aaron Goodson
    TI__Expert 6330 points

    John,

     

    I have looked further into your request. It looks like the additional 4.7uF and 10uF caps are there to represent the capacitive load that is to be expected on the device. You can see this in the simplified schematic on the datasheet for the device.

    The datasheet also states that the effective output capacitance should not be less than 3.4uF. I tried taking data with only a 2.2uF attached, but the data did not look good because of this. The datasheet has some load transient plots that were taken with the load capacitance from the schematic above that you can share with your customer.

    Thanks,

    Aaron