LM5116: LM5116

Adam S

Part Number: LM5116

Hello,

I'm getting mismatch between Excell Spreadsheet and PSpice fot TI Average Simulation.

All downloaded from your website.

With my values the excell shows phase margin of 35.8 (which seems to be correct) and the PSpice simulation is showing -17 deg.

LM5116_quickstart_AS.xls

LM5116_AVG.DSN

Also the crossover frequencies are different with the same component values.

I'm attaching documents with my own values.

Could sb help where I'm making mistake in PSpice Simulation?

over 2 years ago

0 EricLee over 2 years ago

TI__Mastermind 46081 points

Hello Adam

Please use the WEBENCH simulation result if any difference between two.

WEBENCH AC simulation result is supposed to be more accurate than the Excel Quick start result because the excel calculator uses a simplified equations to plot the bode plot.

- Eric Lee

0 Adam S over 2 years ago in reply to EricLee

Intellectual 990 points

Thanks,

WEBENCH shows same result as Excel.

This is why I'm concerned because it seems the PSpice model is wrong

0 EricLee over 2 years ago in reply to Adam S

TI__Mastermind 46081 points

Hello Adam

I got the same result as yours. Please use the result from WEBENCH/Excel Quick Start for now. It will take a time to revise the model.

- Eric Lee

0 Adam S over 2 years ago in reply to EricLee

Intellectual 990 points

Thank you

+1 EricLee over 2 years ago in reply to Adam S

TI__Mastermind 46081 points

Thanks for choosing TI. Please feel free to contact us if you have any question.
- Eric Lee (Applications Engineering)

Power management

Power management forum

LM5116: LM5116