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UCC5310: What is the minimum pulse width of H level signal and L level signal at IN+/IN-?

Kazuya Nakai59
Guru 21575 points
Part Number: UCC5310
Other Parts Discussed in Thread: UCC5320

Hello guys,

 One of our customer is considering using UCC5310 for their next products. They want to know the answers of the following questions. Could you please give me your answers?

1. What is the minimum pulse width of H level signal and L level signal at IN+/IN-?

2. If the minimum pulse width of H level and L level is 40ns,  what is the output pulse width of OUTH/OUTL when H level or L level input signal with pulse width less than 40ns is input to IN+/IN-? Are OUTH and OUTL level not changed? the previous level is kept? Also is there any problem or malfunction when such short pulse signal is input?

3. When the customer uses UCC5310, do they need to filter the short pulse input signal?

 Your answers would be appreciated.

 Best regards,

 Kazuya Nakai.

  • 0
    TI__Intellectual 2805 points

    Hello Kazuya,

    1. We do not have characterization data on minimum pulse width of H and L level signals for IN/IN-. I can however measure a typical value on the bench if needed. 

    2. Any value less than the minimum pulse width will result in unexpected outputs.
    3. Normally we recommend a small input filter for filtering out ringing introduced by nonideal layout or long PCB traces. 

    regards,
    Mateo



  • 0
    TI__Genius 12990 points

    Hi Kazuya,

    I managed to do a non-verified, quick bench test on a UCC53x0 EVM and a UCC5320 part similar to the UCC5310.

    My results show that with a 40ns input pulse (top scope shot - green) there is no output pulse (top scope shot - blue). Since I only have 10ns resolution on my FG I test with a 50ns pulse next. The results show that the 50ns pulse (bottom scope shot - green) produces about a 30ns output  (bottom scope shot - blue). The minimum width of a narrow pulse on the input is 50ns to produce a similar pulse on the output. For this minimum pulse test there is no need to worry about less than 50ns.

    Thanks, 

  • 0 in reply to Jeffrey Mueller
    Guru 21575 points
    Hi Jeff,
    Thank you very much for your prompt reply.
    Your reply is very helpful for our customer and me.

    Thank you again and best regards,
    Kazuya Nakai.