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Since the maximum value of the voltage drop time is determined by the discharge time of the external capacitor, calculation is as follows.
Voltage Drop Time=-CxRxIn (output voltage/output voltage after t sec)
For example, for an external capacitor C=1uF, feedback resistor R=75kΩ, output voltage=1.2V, and output voltage after t sec=0.18V, the output drop time is