Patent ID: 9608510
Date: 2017-03-28
CPC Classifications: H02M

Claim:
1. A switching regulator, comprising: an input port, configured to receive an input voltage; an output port, configured to provide an output voltage; a power converter, coupled between the input port and the output port, the power converter including an inductor, a main power switch and a secondary power switch; a current comparator, having a first input terminal configured to receive a voltage feed forward signal indicative of the input voltage, a second input terminal coupled to the power converter to receive a current sense signal indicative of an inductor current, and an output terminal configured to generate a reset signal based on the voltage feed forward signal and the current sense signal; a RS flip flop, having a reset terminal coupled to the output terminal of the current comparator to receive the reset signal, to turn off the main power switch when the current sense signal reaches the voltage feed forward signal; an over voltage comparator, having a first input terminal configured to receive the voltage feed forward signal, a second input terminal configured to receive a reference wave signal, and an output terminal configured to generate an over voltage detected signal based on the voltage feed forward signal and the reference wave signal; and a controller, coupled to the over voltage comparator to receive the over voltage detected signal, to generate a control signal, so as to execute over voltage protection when the switching regulator is in an over voltage condition.