I am trying to understand why the output capacitor in a switching regulator must be low ESR, and how that varies from ESI. Can anyone help?

 

Originally posted by billcrup@Jan 26 2005, 03:01 AM
I am trying to understand why the output capacitor in a switching regulator must be low ESR, and how that varies from ESI. Can anyone help?

[post=4798]Quoted post[/post]​

ESR means Equivalant Series Resistance. It is the resistance of the electrolyte and increases the impedance of the capacitor - which is a bad thing.

I have never heard of ESI in connection with electrolytics,

 

What is ESI? Is it Equivalent Series Current?

 

hi

if you want your electro cap to give a long service life use low esr type but it does not mean that you can't use electro caps with a considered high esr.