Current detection circuit and switching regulator thereof

摘要

In one embodiment, a current detection circuit configured for a switching regulator can include: (i) a feedback controlling circuit configured to control a feedback signal to be consistent with a reference signal, and to generate a feedback control signal; and (ii) a feedback signal generator configured to receive a rise time and a fall time of inductor current of the switching regulator, and to generate the feedback signal in direct proportion with the feedback control signal.

主权项

1. A current detection circuit configured for a switching regulator, the current detection circuit comprising:
a feedback controlling circuit configured to control a feedback signal to be consistent with a reference signal, and to generate a feedback control signal; and a feedback signal generator configured to receive a rise time and a fall time of inductor current of said switching regulator, and to generate said feedback signal in direct proportion with said feedback control signal, wherein said feedback signal generator comprises a switching circuit having first and second switches coupled in series between said feedback control signal and ground, and a filtering circuit having a filtering resistor and a filtering capacitor coupled in series between a common node of said first and second switches and ground, said feedback signal being configured as an output on a common node of said filtering resistor and said filtering capacitor.