Part Number: UCC2897A
Tool/software: WEBENCH® Design Tools
I am trying to run simulation based on the model availabe on the TI website. In the given simulation of UCC2897A the output voltage considered is 3.3V.
I am trying to design forward clamp converter for 14V output. I relcalculated all the required values of resistor and capacitor values for required gains and compensation using the equations mentioned in the below link
But the output always settles at 3.3V. May i know what other changes i need to consider to simulate in TINA to get 14v at output.
Have you change the restive divider feeding the TL431 reference and modified the transformer turns ratio?
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
In reply to Peter Meaney:
yes i have changed both of them even then output settles at 3.3V
In reply to MANOJ GUNDA:
slum606 - Copy.tscUCC2897A_test.tsc
I have attached two links . slum606 -copy is the one with changed values. and UCC2897A- test with the one i completely changed . Please look into this for your reference
I am trying to simulate the file but taking a very long time to complete, how long are you waiting for the results on your setup?
Thanks for the response. I was looking for your response.
Slum6060 copy used to give result in a hour.
But the UCC2897A_ test takes a very long time more than 2 hours to get results.
I have made some changes to the simulation model. this is taking lesser time. but still, the result is not going above 3.3V.
please kindly look into this and help.UCC2897A_test_1.tsc
Any suggestions for the above issue.
looking for your support.
I modified the schematic for the 14V operation, I had to reduce the Current transformer burden resistor to 2R in addition to the transformer and output voltage potential divider.
I replaced the SR's with diodes to simplify the circuit but it stills crashes at about 80ms but you can see the output voltage approaching regulation.
I have attached the schematic and parameter file, if you go to and continue to adjust the parameters you should hopefully get the full circuit to simulate.
Thanks a lot for the simulation model. But i was unable to use parameter file. can you help me with how to access that parameter file.
Go to the Analysis tab, on the drop menu select Analysis Parameters and you will see the list of parameters available.
The ?Help button will take you to a description of each parameter setting.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.