How to determine the inductor's value in the C6678 EVM schematic?

Feng

Hi all,

In the EVM schematics, there is one kind of component showed in the below image

And I want to know how to determine the inductor and capacitor's values. Are there any TI's documents about this situation?

Thanks for any replies!

over 12 years ago

0 Bill Taboada over 12 years ago

TI__Mastermind 42545 points

The part used for the EVM is a Murata EMI capacitive filter part number NFM18CC222R1C3. You can find the charactoristic behavior of this component in the data sheet which can be found on the Murata website.

0 David Meixner over 12 years ago in reply to Bill Taboada

TI__Expert 4010 points

Hi Bill,

The EVM shows p/n NFM18CC222R1C3, which has 2,200pF capacitance.

The Keystone HW Guide SPRABL2B (table 14) states p/n NFM18CC223R1C3, which has 22,000pF capacitances.

Which is correct?

Thanks,
David

0 Bill Taboada over 12 years ago in reply to David Meixner

TI__Mastermind 42545 points

Hi David,

The choice of device depends on the amount and the frequency of the noise in your system. The more aggressive 22,000pF device will filter starting at frequencies lower then the 2200pF device used on the EVM. Take a look at the data sheet for these devices and you will see the frequency characteristics. The EVM was successful with the less aggressive 2200pF device so we never changed it to the 22,000pF device.

Regards, Bill

0 David Meixner over 12 years ago in reply to Bill Taboada

TI__Expert 4010 points

Bill, thanks for the clarification.

Processors

Processors forum

How to determine the inductor's value in the C6678 EVM schematic?