Methods for sensing current in a switching regulator
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United States of America Patent
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Nov 14, 2017
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app pub date -
Sep 29, 2011
filing date -
Sep 29, 2011
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Abstract
In one embodiment, a current sensing circuit includes a differential current sensing amplifier adapted for sensing a voltage drop across a main transistor, the differential current sensing amplifier being adapted for providing a switched current output to a timing circuit which is adapted for providing a timing signal to one or more switching current sample-and-hold circuits based on a current waveform of the switched current output, and the one or more switching current sample-and-hold circuits, each of which are adapted for producing a substantially continuous output current. In another embodiment, a method for detecting a current includes driving a main transistor with a first current, driving one or more sensing transistors with a second current, measuring a sensing inductor current of the one or more sensing transistors, and determining the first current based on the sensing inductor current, wherein the sensing inductor current is related to the first current.
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