TINA/Spice/UCC28C42: UCC28C42 convergence problem

lorenzo fagnani6

Part Number: UCC28C42
Other Parts Discussed in Thread: TINA-TI, , PMP10783, UCC28C40

Tool/software: TINA-TI or Spice Models

Good morning
I'm trying to replicate a Buck circuit not isolated with the integrated UCC28C42.
The schematic I took from PMP10783 board.
Unfortunately, reproducing also the schematic (PMP10783), Spice cannot simulate it because there is a convergence problem. The same error as me TINA
Has anyone had this problem?

Thank you
Lorenzo

over 7 years ago

0 Mahavir Jain over 7 years ago

TI__Intellectual 2405 points

Hi Lorenzo,

It is not possible for us to respond back and support without actually looking at the problem. Could you please share the TINA schematic where you're facing convergence issues?

Also, we have both startup and steady state test benches available in product folder of this part (under Tools & Software) section. Did you try any one of them? I could download and simulate design without any issues in TINA-TI. So I request you to take a look at these as well.

Thanks!!

Best Regards,

0 lorenzo fagnani6 over 7 years ago in reply to Mahavir Jain

Prodigy 80 points

Hi Mahavir,
I have reproduced the schematic PMP10783, just that if I do start the transition, there is a convergence error diodes (are sized correctly).
If I change the schematic, using the same GND, I have no problem.
How do I show it to you to check the problem?

Thank you

0 lorenzo fagnani6 over 7 years ago in reply to Mahavir Jain

Prodigy 80 points

ACDC_PowerSupply.TSC

0 lorenzo fagnani6 over 7 years ago in reply to Mahavir Jain

Prodigy 80 points

Sorry for the mail but there is an error in the schematic that i send you. V2 is 325Vdc not 15Vdc.
Sorry
Lorenzo

0 Nagabhushana Chittaragi over 6 years ago in reply to lorenzo fagnani6

Prodigy 245 points

Hello Lorenzo,

I'm able to run the schematic that you sent above. Just replaced the macro of UCC28C40. Please find the attached .TSC. Let us know if you find any issue.

Regards,

Bhushan

ACDC_PowerSupply_08MAR.TSC

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TINA/Spice/UCC28C42: UCC28C42 convergence problem