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LM5166: LM5166X ripple

Part Number: LM5166

Hi,

 I have a problem with a DC/DC I used in a new design implementation regarding the ripple at output. Specifically we are talking about the LM5166XDRCR part. I have used a calculator from the TI website ( http://www.ti.com/tool/lm5166design-calc) (LM5166_Quick_Start_Calculator_RevB) where appears that the final ripple will be around 50mVpp working in PFM mode. Instead of this we get 300mVpp. I wanted to know what’s wrong in the design and how to get the initial goal without inserting more components.

Regards