SNVA941A June 2020 – November 2022 LM5156 , LM5156-Q1 , LM51561 , LM51561-Q1 , LM51561H , LM51561H-Q1 , LM5156H , LM5156H-Q1
The soft-start capacitor is used to minimize and overshoot on the load voltage during the start-up of the regulator. Equation 21 is used to calculate the minimum recommended soft-start capacitor value.
where
For this design a CSS value of 220 nF is selected to minimize any overshoot on the load voltage during start-up.