UCC2813-0: Drastic variation of Duty cycle

Sweshwaran M

Part Number: UCC2813-0
Other Parts Discussed in Thread: UCC2800

Hi, here is the gate pulse plot for UCC2813-0 flyback controller.

I am trying to simulate this FBC operated in DCM in simetrix. The pulse width is not becoming constant even after reaching the steady state. Can this be attributed to compensator variables?

or is this a simulation model error?

Also, I could not import this in simplis, can you please send simplis compatible IC model.

3 months ago

0 Hong Huang 3 months ago

TI__Guru 51235 points

Hi,

You can make it in open loop control to check if your IC model is good to run ok. If ok, then your closed loop has something to fix. Loop compensation is one of them to check.

0 Sweshwaran M 3 months ago in reply to Hong Huang

Prodigy 65 points

Hi Huang, The issue got resolved. It was with the compensator values. Can you please share the simplis model of UCC2800 or any other equivalent model. That would be really helpful.