Real time adjustable zero current detection for a switching regulator
AssigneeRichtek Technology Corporation
InventorsShao-Hung Lu, Isaac Y. Chen, An-Tung Chen
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Abstract
A feedback loop is used to optimize a zero current threshold for a switching regulator. After the low side power switch of the switching regulator turns off, the switching node state is monitored to adjust the zero current threshold in a real time and thus the low-side power switch is prevented from turning off too early or too late. Thereby the efficiency in green mode is optimized.
Claims12
A real time adjustable zero current detector for a switching regulator including a high-side power switch connected to a low-side power switch through a switching node, the detector comprising:
- a feedback loop connected to the switching node, monitoring the switching node state after the low-side power switch turns off to optimize a zero current threshold;
- and
- a comparator connected to the feedback loop and the switching node, comparing a voltage of the switching node with the zero current threshold to trigger a zero current signal.
A real time adjustable zero current detection method for a switching regulator including a high-side power switch connected to a low-side power switch through a switching node, the detection method comprising the steps of:
- (A) monitoring the switching node state after the low-side power switch turns off to optimize a zero current threshold;
- and
- (B) comparing a voltage of the switching node with the zero current threshold to trigger a zero current signal.
Dependencies are inferred from the claim text.