• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 64 subscribers
  • Views 166 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

UCC28180: Request for UCC28180 TINA-TI Transient Spice Model

Conor
Guru 10670 points
Part Number: UCC28180
Other Parts Discussed in Thread: TINA-TI, UCC2818A

Tool/software:

Hi,

I plan to use TINA-TI to verify the UCC28180 Transient Spice Model. In the following thread, there was an answer that said, "It looks like this TINA model is actually not a transient model but an average model."
https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/888429/ucc28180-pspice-model-help-tina-ti---urgent-p

I actually downloaded the Transient Spice Model from the product page and tried to verify it, but the Gate signal could not be simulated correctly. Since a 0-1V rising waveform was output instead of a 0-12V pulse waveform, it seems that an average model is probably being provided.

Q1.
Is it possible to provide a TINA-TI Transient Spice Model that works accurately? If that is difficult, could you suggest an alternative? We are considering replacing UCC2818A with UCC28180, and need to verify the operation of UCC28180.

Q2.
The currently provided Transient Spice Model has 6 pins, but the actual IC has 8 pins. FREQ and Vcc are omitted in the Transient Spice Model. We would like to change the frequency of UCC28180 and perform a simulation. We would also like to simulate VCC to verify operation during a momentary power outage. How should we perform the verification?

Thanks,

Conor

  • +1
    TI__Mastermind 35600 points

    Hello Conor, 

    Yes the TINA-TI model for UCC28180 is in fact an average model, despite being named a Transient model. This average model is capable of accurately simulating Vout with the voltage-loop response to line and load transients, but it is not capable of providing any switching waveforms, including the gate-drive output. This output is a voltage representation of the PWM duty cycle at any particular point in the line cycle. 

    Answer to Q1:  See statement above. 

    Answer to Q2:  The switching frequency is entered as a parameter by double clicking on the UCC28180 Transient Model symbol and editing the frequency. 

    There is no way to simulate the effects of VCC with this model.  You can only infer what happens when VCC falls below the 9.5V UVLO threshold (it shuts off), account for the worst-case loading on VCC, and design the VCC source to avoid that situation during all anticipated line conditions. 

    Regards,
    Ulrich