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TINA/Spice/TLV4113: TLV4113

Steven Shenker
Intellectual 860 points
Part Number: TLV4113
Other Parts Discussed in Thread: TINA-TI, TLV4111

Tool/software: TINA-TI or Spice Models

I downloaded the TINA TI Spice model for this part from:

http://www.ti.com/product/TLV4113/toolssoftware

When running the model in feedback loop with a simple 5v PWM at 40Hz at the +ve terminal, with 5V and GND for supply I am unable to drive within 1V of the +ve supply rail. If I increase the supply voltage to e.g 5.5V then the voltage will go up to 4.5V.

Surely this goes against the datasheet rail to rail spec? Please let me know if this is somehow expected behaviour. In the attachment green is VG2, red is VF3. I have checked and the model signals are all connected correctly.

Thanks in advance.

  • 0
    Guru 48395 points

    Well Steve, 

    The TINA model was just updated this year it appears, and yes the output swing does not match the data sheet - seems in error, there is a macromodel listing on page 17 for the original Boyle model if you need to go back to that, 

  • 0 in reply to Michael Steffes
    TI__Expert 6250 points

    Michael, Steve,

    This behavior is caused by the way we model the common mode range limitations in newer op amp macromodels. Since the behavior of a given op amp outside its common mode range may vary from device to device, and isn't something we usually characterize, we model the common-mode range by clamping the noninverting input if it exceeds the valid range. For the TLV4111, the valid common-mode range ends 1.5V from the positive supply, which is mirrored in your simulation above. If you test in another configuration, say an inverting gain of -1, you will see the correct output swing behavior:

    TINA-TI Simulation File

    We strongly recommend using the newer macromodels when available, as they more accurately capture many of the key specifications of the amplifier, and are far more convergence-friendly than the older model architectures.