SNVSAE4C July 2015 – October 2018 LM5160-Q1
The soft-start feature of the LM5160-Q1 allows the converter to gradually reach a steady-state operating point, thereby reducing start-up stresses and current surges. When the EN/UVLO voltage is above the EN/UVLO standby threshold VUVLO(TH) = 1.24 V (typical) and the VCC voltage exceeds the VCC undervoltage threshold, VCC(UV) = 3.98 V (typical) , an internal 10-µA current source charges the external capacitor at the SS pin (CSS) from 0 V to 2 V. The voltage at SS is the noninverting input of the internal FB comparator. The soft-start interval ends when the SS capacitor is charged to the 2-V reference level. The ramping voltage at SS produces a controlled, monotonic output voltage start-up. Use a minimum soft-start capacitance of 1 nF for all applications.