Circuit with Controlled Inrush Current

摘要

A circuit is provided with inrush current protection through control of the output current at start-up by a current source that does not rely on the output capacitor and which provides a smooth transition from a controlled current mode during a start-up phase to a voltage regulation mode.

主权项

1. A circuit for managing power provided at an output and comprising:
a decoupling capacitor at the output; a pass device for selectively delivering output current and charging the decoupling capacitor; a driving circuit for the pass device comprising
an override transistor,a differential amplifier for regulating an output voltage andan output transistor coupled with an output of the differential amplifier; a current source that is coupled with said override transistor when the circuit is in a start-up state and which controls the start-up current at the pass device; and wherein the override transistor and the differential amplifier output transistor are coupled such that a voltage across the differential amplifier output transistor changes with the voltage across the override transistor, and the override transistor transitions between saturation at start-up to a linear mode.