Capacitor Selection - Suggestions for 100kHz Low ESR Decoupling

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For decoupling at a 100kHz switching frequency with a current ripple of about 1A, selecting a capacitor with low ESR is essential. The circuit operates at 10V DC and outputs 50A, necessitating careful capacitor choice to handle ripple effectively. Suggestions include exploring options specifically designed for switch mode power supplies, which can be found on platforms like DigiKey. It's important to clarify any previous capacitor options considered and the reasons for dissatisfaction. Proper capacitor selection is crucial for maintaining circuit performance under these conditions.
deen25
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capacitor selection...

Hey,

I'm having a bit of trouble selecting a capacitor and I just want to know if anyones got any suggestions ?...

I need a capacitor for decoupling...that would be suitable at 100kHz switching frequency..withstanding a current ripple of about 1A with a low ESR...this is required for decoupling. The circuit is supplied with 10V dc producing an output current of 50A.

has anyone got any suggestions or specifications you have already worked with ?cheers!
 
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deen25 said:
Hey,

I'm having a bit of trouble selecting a capacitor and I just want to know if anyones got any suggestions ?...

I need a capacitor for decoupling...that would be suitable at 100kHz switching frequency..withstanding a current ripple of about 1A with a low ESR...this is required for decoupling. The circuit is supplied with 10V dc producing an output current of 50A.

has anyone got any suggestions or specifications you have already worked with ?


cheers!

If it's supplied with 10Vdc, why is there ripple current? Is this part of your synchronous Buck DC-DC circuit? Can you show us the schematic for the application of this capacitor -- that would help us help you understand your choices.
 


hey...

I just drew this simple schematic now. It somewhat shows what the entire cct will look like..

hope this helps...

cheers!
 

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deen25 said:
hey...

I just drew this simple schematic now. It somewhat shows what the entire cct will look like..

hope this helps...

cheers!

What kind of capacitor options have you looked at so far? Why were you not happy with them? Tell us what work you have done in selecting this capacitor, other than just asking us about it.
 


Berkeman, ANY decoupling capacitor will have ripple current. If it doesn't have ripple current then it doesn't need to be there.
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I believe the main thing you are looking for would be a low ESR/ESL cap. Grab a DigiKey catalog or go to the web-site. I believe they have selections for capacitors used specifically in switch mode power supplies.
 

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