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TLV3691 Turn-On Output Glitch

Neil Albaugh
Genius 5430 points
Other Parts Discussed in Thread: TLV3691

Simulating power-on with a TLV3691 in TINA or P-SPICE produces a 2V 360us output glitch. I assume this is a problem with the macromodel- can you confirm that the actual device does not exhibit this behavior? If it is a problem with this model you might want to fix it as a customer is already questioning the selection of a TLV3691 for his circuit design based on a simulation showing this output glitch.

  • 0
    TI__Guru* 93105 points

    Hi Neil,

    I recently did some bench testing of the TLV3691 power on reset circuit (POR) and it worked exactly as expected. I didn't see any turn-on/ turn-off glitches so I do expect the behavior is something unique being produced by the simulation model.

    I just ran some tests of the simulation model and found a 5 us glitch having an amplitude of 35 mV at start-up. Very likely my circuit is different than yours and maybe the glitch is different for different setups. Could you send us your TLV3691 TINA circuit file?

    Thanks for bringing this to our attention.

    Regards, Thomas

    PA - Linear Applications Engineering

  • 0 in reply to Thomas Kuehl
    Genius 5430 points
    Thanks for the super-fast answer, Tom. I found that ramping the supply up from 0V to 5V in more than 10ms causes only a very small glitch; less than 500us causes around a 2.5V output glitch. This makes me suspect that there may be a capacitive coupling artifact in the model.

    I can send my TINA circuit file but I need your TI e-mail address.

    Regards, Neil
  • 0 in reply to Neil Albaugh
    TI__Guru* 93105 points

    Hi Neil,

    Thanks for the start-up details for the TLV3691. You can actually attach the TINA file to your response using the paperclip icon. However, if you want you can send it to my direct email address. The E2E keeps adding a weird suffix to my address so here it is with at in place of the ampersand symbol:

    kuehl_tom at ti.com

    Actually, I am in Germany right now and late evening is a good time to catch up on email and the E2E!

    Regards, Thomas

    PA - Linear Applications Engineering

  • 0 in reply to Thomas Kuehl
    Genius 5430 points

    Was this problem ever fixed?

  • 0 in reply to Neil Albaugh
    TI__Guru* 93105 points

    Hi Neil,

    No it hasn't been fixed, but the model is scheduled for the work. I just checked the modeling group's schedule and it shows a forcasted date of 06/29/17. Please note that all the TI analog comparators, including the TLV3691, are now supported by TI's Low Power Amps and Comparators group.

    Regards, Thomas

    Precision Amplifiers Applications Engineering

  • 0 in reply to Thomas Kuehl
    Genius 5430 points
    Thanks, Tom. TI really needs to get its act together developing device models. Tell management that their customers may start to look elsewhere for products with models.