SNVSCM3 June 2024 LM5171
PRODUCTION DATA
Soft start is used to ramp the current slowly. For applications with outer loop, the current soft start is not desired, CSS should be minimized. Typically we can select 0.1nF for CSS.
For applications where current soft start is required, place a ceramic capacitor CSS to programmed the soft start time. The soft start completes when the SS pin voltage reaches approximately 3V. If full load current soft start time ΔTSS = 1ms is chosen, the capacitor CSS can be calculated as :
When SS/DEM1 and SS/DEM2 are connected together, double the capacitance to maintain the same soft start time.