Method and apparatus for controlling a startup signal during a brownout

摘要

Apparatus and methods for controlling a startup signal during a brownout. The invention controls the startup of a signal during the brownout using a monitor circuit and a control circuit. The startup signal is used in conjunction with a soft start feature to regulate power. The monitor circuit is configured for monitoring an input signal to the circuit and for providing a control signal in response to a change in the voltage level of the input signal. The control circuit is configured for receiving the control signal from the monitor circuit to control the startup signal during the brownout. The control circuit may control the startup signal with a transistor by electrically grounding the startup signal such that a capacitor may discharge during the brownout. The control circuit may prevent undesirable triggering of over-current protection circuitry within the regulator.