SNVSAE4C July 2015 – October 2018 LM5160-Q1
As mentioned earlier in Soft Start, the SS capacitor CSS must always be more than 1 nF in both buck and Fly-Buck converter applications. Apart from determining the start-up time, this capacitor serves as the external compensation of the internal GM error amplifier. A minimum value of 1 nF is necessary to maintain stability. The SS pin must not be left floating.
The VCC pin of the LM5160-Q1 must not be biased with an external voltage source. When an improved efficiency requirement warrants an external VCC bias, the LM5160A must be used.