TPSM8S6C24: Pspice model behavior changing based on time to simulate

Robin Bochen

Part Number: TPSM8S6C24

Tool/software:

I am working on building a load model of the TPSM8S6C24MOY part. It is in use in our products. The spice model works well as given by TI. but when I modify it to match our actual schematic ( which was built in collaboration with TI and works well) I see some rather interesting behavior. In pinstrap mode, the set voltage seems to drift? Here are 3 pictures all with the same exact setup, except for the time to sim changed. The drift after the current pulse is also quite odd. I am working with a Cadence apps engineer as well to see if the tool is the problem.

3 months ago

0 Robin Bochen 3 months ago

Prodigy 10 points

Here is a better highlight of the drift after the current pulse

0 Robin Bochen 3 months ago

Prodigy 10 points

I also see that the switching frequency shifts after the current event.

0 Calan Elaya 3 months ago in reply to Robin Bochen

TI__Genius 11405 points

Hello,

A response will be posted in a few days.

Thanks,

Calan

0 Savith Kumar Rayakanti 3 months ago in reply to Calan Elaya

TI__Expert 5960 points

can you pls share the project zip that you created

Thank you

Savith

0 Robin Bochen 3 months ago in reply to Savith Kumar Rayakanti

Prodigy 10 points

TPSM8S6C24_TRANS-PSpiceFiles.zip

0 Robin Bochen 3 months ago in reply to Calan Elaya

Prodigy 10 points

Thank you! At this point cadence has pointed out that I need to be using a much smaller max time step. I did this and the sim looks more independent of the time to sim. The remaining issue is that the output voltage drifts upward after the current pulse