PSPICE-FOR-TI: Issue with LM2775 Model

Mudi SriSai Kumar

Part Number: PSPICE-FOR-TI
Other Parts Discussed in Thread: LM2775

I am using LM2775 model in PSPICE for TI. In simulation, instead of connecting GND pin of device to 0v/GND, i connected to a fixed voltage(common mode voltage).

And input is 3.3V and I expected output of 5v w.r.t GND pin of Device but I am getting different output. please refer the below images.

Thanks

Sai Kumar

over 1 year ago

0 David Larkin over 1 year ago

TI__Mastermind 20460 points

Hi Sai,

I've re-directed this to the product group.

The model is encrypted, so I can't tell what's going on.

It might be that some circuits use a global ground, while others might use the external ground. The product line that's responsible for this model should be able to answer your questions regarding model behavior.

David

0 Brigitte over 1 year ago in reply to David Larkin

TI__Guru 66350 points

Hello Sai,

As this is a duplicate of this request: (+) LM2775-Q1: LM2775 wih common mode voltage - Power management forum - Power management - TI E2E support forums I will close this one.

Best regards,
Brigitte

0 Mudi SriSai Kumar over 1 year ago in reply to David Larkin

TI__Prodigy 80 points

Hi David

Do you have any update on the model changes?

Thanks

Sai Kumar

0 Niklas Schwarz over 1 year ago in reply to Mudi SriSai Kumar

TI__Mastermind 30390 points

Hello Sai,

I am sorry to inform you that there has not been an update of the LM2775 model yet.
The GND pin of the model still needs to be connected directly to external GND for the simulation to run smoothly.

Best regards,
Niklas

Simulation, hardware & system design tools

Simulation, hardware & system design tools forum

PSPICE-FOR-TI: Issue with LM2775 Model