Current detection and emulation circuit, and method thereof
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United States of America Patent
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Nov 10, 2015
Grant Date -
Aug 6, 2015
app pub date -
Jan 31, 2014
filing date -
Jan 31, 2014
priority date (Note) -
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Abstract
A current detection circuit for detecting a current in a SMPS which has a first switch and a second switch; a current sensing circuit sensing a second switch current flowing through the second switch and providing a current sensing signal; and a current emulation circuit which generates a first current according to the current sensing signal and generate a second current according to the first current source, and the current emulation circuit further providing a current emulation signal based on the first current source and the second current source; wherein a current detection signal during a first period is proportional to the current emulation signal, and the current detection signal during a second period is proportional to the current sensing signal.
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