After being enabled, the device starts operating. The average current limit ramps up from zero to the nominal current limit value. Thus, the output voltage overshoot at start-up, as well as the inrush current, is kept at a minimum. The device ramps up the output voltage in a controlled manner, even if a very large capacitor is connected at the output.
At an overload or short circuit condition at the output, the average current limit protects the device itself and the application. Higher change rates of output current or input voltage can trigger an additional built-in short circuit protection mode, which reduces the current limit to less than 50% of the nominal current limit. In this mode, the switching frequency can be reduced as well.