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TPS709: 6 V Output Version Spice Model Does not Work

Luke Cerda
Prodigy 10 points
Part Number: TPS709
Other Parts Discussed in Thread: TINA-TI,

Tool/software:

Hello,

I'm trying to simulate the unencrypted Spice file for TPS70960, but it does not output 6V despite closely following the application notes.

I also tried simulating it on PSpice for TI and the same thing happens - the output is stuck at 2 mV for an input of 24 V even when loading the output.

Is possible to get a fixed version of the unencrypted Spice file for TPS70960?

Many thanks!

  • 0
    TI__Genius 12550 points

    Hi Luke,

    I've tested with the current version of the unencrypted TPS70960 model from the product page and cannot seem to reproduce this in PSPICE 17.4, PSPICE for TI, or TINA-TI. Transient and bias point simulations both reach the expected 6V output with a 150mA (40Ω) resistive load.

    The one issue I experienced was related to the NC pin. Tying NC to GND short-circuits an internal voltage source in the model and causes a simulation error. Leaving NC floating or adding a series resistor between NC and GND resolved that issue. 

    Can you share the circuit you're trying to simulate, as well as the type of simulation (transient, bias point, DC sweep, AC sweep) you're trying to perform?

    Best Regards,

    Alex Davis

  • 0 in reply to Alex Davis
    Prodigy 10 points

    Hi Alex,

    Here is the circuit I'm trying to simulate.

    Could you also share the circuit and simulation settings that got it to work?

    Thank you!

    Luke

  • 0 in reply to Luke Cerda
    TI__Genius 12550 points

    Hi Luca,

    It looks like although the TPS709 enable pin can be left floating to enable the device, the model does not account for this behavior. If you connect EN to VIN in your test above, the model should behave as expected. 

    Best Regards,

    Alex Davis