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WEBENCH® Tools/LM61460: Cff value is different from datasheet.

Seokmin Hong
Intellectual 485 points
Part Number: LM61460

Tool/software: WEBENCH® Design Tools

Hi, I am trying to use LM61460 for the system.

Vin : 24V

Vout : 5V

freq : 1.18Mhz

Iout(max) : 5A

In the datasheet, recommended Cff for the Vout 5V is about 10pf~30pF.

But from the webench desing tool

Cff value is 3pF.

I am confused. Which value is more adequate for my system? 

Vin : 24V

Vout : 5V

freq : 1.18Mhz

Iout(max) : 5A

  • 0
    TI__Mastermind 22301 points

    Seokmin,

    The tables you show are for 2.2MHz and 440kHz designs. 

    Table 3 in the datasheet shows a 1MHz design with a 4.7pF CFF.

    3.3pF and 4.7pF should be close enough to have similar results.

    Otherwise, if you use a larger COUT than WEBENCH recommends you will see better transient with larger CFF.

    Hope this helps,

    -Orlando