fall time

When the input power is shut off in circuits such as power supply circuits, the output voltage decreases gradually due to transient phenomena and eventually becomes 0. The time it takes for the output voltage to drop from 90% to 10% is referred to here. It is one of the indicators of transient characteristics when the input power is turned off. The longer the fall time, the more stable the output is against instantaneous power outages or voltage drops of the input power. When there are many capacitive components in the circuit, the fall time tends to be longer due to the discharge time.