WEBENCH® Tools/LM5140-Q1: LM5140-Q1

Kevin,Shen

Prodigy 230 points

Part Number: LM5140-Q1

Tool/software: WEBENCH® Design Tools

Hi,

Would you please provide the average pspice model of LM5140-Q1, which I can't find on TI's Web.

Beside, I wonder whether the value and ESR of output capacitor will affect the loop response such as phase margin.

Would you please provide some docs to analyze the effects of value and ESR of output capacitor?

Thanks anyway!

Kevin Shen

over 5 years ago

0 Ethan T over 5 years ago

TI__Expert 3835 points

Hi Kevin,

Unfortunately there is no LM5140-Q1 average model. You can utilize other tools such as Webench Designer that can be found on the product page or Power Stage Designer for some loop analysis.

The ESR will affect loop response because it causes an ESR Zero. The frequency the zero can found at is = 1/(R_esr * C_out). Here is an app note that help when using hybrid output capacitors. Here is another technical paper on compensation. There are some mentions of output capacitors and its ESR.

Regards,

Ethan

Power management

Power management forum

WEBENCH® Tools/LM5140-Q1: LM5140-Q1