Current detection circuit and switching regulator thereof
AssigneeSilergy Semiconductor Technology (Hangzhou) LTD
InventorChen Zhao
Life of this patent
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Abstract
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.
Claims20
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.
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;
- 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;
- a comparator configured to receive said feedback signal and said reference signal;
- a first switching circuit comprising first and second switches coupled in series between a voltage source and ground, wherein said first switch is controllable by an output of said comparator, and said second switch is controllable by an inverted version of said comparator output;
- and
- a first charging capacitor coupled to a common node of said first and second switches, wherein a voltage across said first charging capacitor is configured as said feedback control signal.
Dependencies are inferred from the claim text.