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UCC27517A / propagation delay

K.Yaita
Guru 29720 points
Other Parts Discussed in Thread: UCC27517A

Hi Team,

I would like to ask two questions about switching characteristics of UCC27517A.

1)
The condition of "5-V input pulse" is described at tD1 only.
Is there any reason there isn't the same description at tD2? 
I believe it is abbreviation but would like to confirm just in case.


2)
It seems the value of propagation delay is specified under "5-V input pulse" condition.
If my customer uses 3.3-V input pulse, how much does it affect the specification?

Best Regards,
Yaita / Japan disty

  • 0
    TI__Mastermind 31580 points

    Hi Kensuke-san,


    I have asked the driver team to clarify the description in the datasheet. They should reply soon.


    Regards

    Peter

  • 0 in reply to Peter Meaney
    Guru 29720 points

    Hi Peter-san,

    Thank you for your support.
    I am looking forward to your reply.

    Best Regards,
    Yaita

  • 0
    TI__Mastermind 23105 points
    Yaita,
    For the 1st question, the test condition would be the same for the IN+ and the IN- input pins. Both have the same comparator input, with the In- pin having an inverting path to the driver.

    For the question 2. The UCC27517A is a fixed threshold input configuration. Propagation delay is defined as the time from crossing the input threshold (2.2V high, 1.2V low) to the time the output rises (of falls) 10%. The peak amplitude of the input signal does not change the time measurement, since it is a fixed threshold.