*The power will be supplied from the external input capacitor Cin if the power supply from the input is cut off. (1). The time it takes for the DC-DC converter to drop down to the lower limit of the operable input voltage can be lengthened by increasing the capacitance value of this input capacitor.
The backflow prevention diode D₁ must also be inserted when removing the input voltage with another circuit connected to the input power supply or input side during an input interruption (2). Please be careful as losses occur in a steady state.