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UCC27517 Input minimum pulse width

masahiko shimizu
Guru 11235 points
Other Parts Discussed in Thread: UCC27517A

Hi

We have question about specification of UCC27517ADBVR.
How about the “Minimum pulse” that UCC27517ADBVR can support?


Best regards,
Shimizu

  • 0
    TI__Mastermind 31580 points
    Hi Shimizu-san,

    I will ask an engineer from the driver team to answer this post for you.

    Regards

    Peter
  • 0 in reply to Peter Meaney
    Guru 11235 points
    Hi Peter,

    How is the progress?

    Best regards,
    Shimizu
  • 0 in reply to masahiko shimizu
    Guru 11235 points
    Hi Peter,

    My customer require your answer.

    I think that there is not Minimum pulse definition because UCC27517A output high level when input signal value is over threshold.
    and threshold value has error as this spec is described in datasheet.
    Is it correct?

    Best regards,
    Shimizu
  • 0 in reply to masahiko shimizu
    TI__Mastermind 20950 points

    Hello Shimizu,

    In reading the original posted question: I think you are looking for the minimum pulse requirement of the IN- to switch the driver output.

    The output will respond within the maximum propagation delay that is specified as tD2 in the datasheet. With Vdd = 12V the maximum is 23ns, with Vdd=4.5V the maximum is 30ns. The driver output will respond with an input pulse that is >30ns; according to the maximum propagation delay limitation in the datasheet.

    It is typically the case: where the minimum pulse may be lower than this, since there is delay on the edge to generate a high driver output, and the edge to generate the low driver output.

    I would need to conduct some testing, to evaluate typical minimum pulse requirements, and to see  the mismatch of driver output pulse width relative to narrow input pulse width.

    In this post you mention that the "threshold value has an error as this spec is described in the datasheet". Can you clarify, if you mean the input signal thresholds are not what you expect in the datasheet; or is there some other concern.

  • 0 in reply to Richard Herring
    Guru 11235 points

    Hi Richard,

     Thank you for your support.

     I could understand by your polite description.

     It is very helpful. 

    Best regards,

    Shimizu