UC2843A: PSpice simulation of this device

Edward Sullivan

Part Number: UC2843A
Other Parts Discussed in Thread: UCC28C43

Tool/software:

I am using the PWM controller UCC28C43_START model from "PSpice for TI" 2024. My simulation is intended to provide a virtual test bench for an actual hardware-implemented buck regulator design with current feedback that is working properly in our lab. The simulation model of the UCC28C43 PWM controller does not work the way the actual device does - in particular, the pulse width of the OUTPUT pin of the UCC2989C43 does not vary with changes to the FB or CS inputs. The PWM output will run at a fixed PW under some conditions, and shuts off under other conditions. My question is: Does this model (UCC28C43_START) provide a fully functional model of the actual device, or is it limited to just provide a baseline testbench that is not usable for a feedback-controlled power supply design?

9 months ago

0 Hong Huang 9 months ago

TI__Guru 73085 points

Hi,

Please provide the link where you get the model.

0 Edward Sullivan 9 months ago in reply to Hong Huang

Prodigy 10 points

UCC28C43 data sheet, product information and support | TI.com

There's another model available here, but the zip files appear to be identical to the ones at the link above:

UCC38C43 data sheet, product information and support | TI.com

0 Edward Sullivan 9 months ago in reply to Edward Sullivan

Prodigy 10 points

I can run the projects included in the zip file that I downloaded that are using the UCC28C43_STARTUP and UCC28C43_STEADY models. My initial try at simulating a circuit using this part uses a model called UCC28C43_START. Three different models, where the first two (STARTUP and STEADY) appear to work using the provided TI circuits, and my circuit, using the START model, doesn't quite seem to work right. Maybe it's an older model. I'll work with the new ones to see if I can get my simulation working using either the STARTUP or STEADY (most likely the STEADY) models.

0 Hong Huang 9 months ago in reply to Edward Sullivan

TI__Guru 73085 points

Hi,

It looks the model on TINA TI works ok. So it looks the model is ok and the issue may be from PSpice for TI. You can make simulation on TINA TI to avoid the issue.

Simulation, hardware & system design tools

Simulation, hardware & system design tools forum

UC2843A: PSpice simulation of this device