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TLV7041: Floating pins in Spice simulation

Yan Huang
Prodigy 30 points
Part Number: TLV7041

Hello, 

I was running a simulation using TLV7041 spice model in LTSpice. However, it keeps telling me that there are some floating pins and I am not observing the desired high output. I am not sure if it is connection problems or something from the model itself. I have attached my circuit and error log below. Could you help me see what was probably going wrong? Thank you. 

  • 0
    TI__Expert 4555 points

    Yan,

    Thank you for bringing this to our attention. I have also tried to simulate your circuit in LTSpice but am getting the same floating node errors. I am looking into what may be causing this in the subcircuit file.

    Have you tried simulating your circuit using TINA? This is our preferred simulator that we would be able to provide more support for.

    I did notice with your circuit that you are violating the device common mode. While the device will not be damaged inputting a 5V signal to the device running off a 3.6V supply, the performance of the part will not be up to spec in the datasheet.

    What kind of application/end equipment is your circuit for?

    Thanks,

    Jonny

  • 0 in reply to Jonathan Nguyen
    Prodigy 30 points

    Hi Jonny, 

    I was using simple input voltages to first test this comparator. I modified it to a 3V input but still getting the same error...

    Also, seems that TINA doesn't have this part number so I had to use LTspice...

    Thanks, 

    Yan

  • 0 in reply to Yan Huang
    TI__Expert 4555 points

    Yan,

    Sorry that just the model was not uploaded on TI.com. We will work to get that up.TLV7041.TSC

    In the meantime, please use the attached circuit file to simulate with the TLV7041 in TINA.

    Regards,
    Jonny

  • 0 in reply to Jonathan Nguyen
    TI__Mastermind 24480 points

    Yan

    One more thing to add is that you need a pull-up resistor on the output since the TLV7041 is an open-drain output device.  Your present circuit shows a resistor to ground instead.

    Chuck

  • 0 in reply to Chuck Sins
    Prodigy 30 points

    Thanks, Chuck! I used a pull-up resistor and the output is giving me expected values, although the floating errors are still there...But this has helped a lot already!