The power stage starts to work when the input voltage is higher than 360 V, and stops working when the input voltage higher than 440 V or lower than 300 V. Power stage waveforms are shown in the following figures.

Figure 3-22 Start to Work When V_IN Above 360 V

Figure 3-24 Shutdown When V_IN is Below 300 V

Figure 3-23 Shutdown When V_IN is Above 440 V