UCC28710: Unexpected simulation results with PMP9087

Shen Yik Chua

Part Number: UCC28710
Other Parts Discussed in Thread: TINA-TI

Dear Team,

I am trying to simulate the reference design PMP9087 with TINA-TI but the results are wrong. It seems like the UCC28710 spice model does not start up properly and thus the output voltage is only few millivolts.

I have tried to add the DC input for VDD but it remained the same.

Therefore I would want to know is this a design error of PMP9087 or is it the software simulation error?

Regards,

ChuaPower_Supply_Sim.TSC

over 4 years ago

0 Mike O' over 4 years ago

TI__Guru 74815 points

Hello,

Just wanted to let you know a TI applications engineer is looking into this for you and will get back to you within the next 3 days.

Regards,

0 Shen Yik Chua over 4 years ago in reply to Mike O'

Prodigy 20 points

Dear Team,

Just to let you know I have found a way to fix the issue. The DC source to VDD pin needs a diode connected to it to make it function properly. Besides that, the VDD pin is disconnected from other parts of the circuit. I have attached the modified version here. However, I still hope that you can correct the spice model issue to avoid confusion.

Thanks anyway.

Regards,

Chua

0880.Power_Supply_Sim.TSC

Power management

Power management forum

UCC28710: Unexpected simulation results with PMP9087