Circuit for generating a dynamic drain-source voltage threshold and method thereof
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United States of America Patent
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Feb 20, 2024
Grant Date -
N/A
app pub date -
Nov 8, 2021
filing date -
Nov 17, 2020
priority date (Note) -
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Abstract
A synchronous rectifier control circuit, used with a synchronous rectification circuit having a primary switch and a synchronous rectifier, having: a drain-source threshold setting circuit, configured to provide a dynamic drain-source voltage threshold based on a drain-source voltage across the synchronous rectifier; a primary switch detecting circuit, configured to provide a primary switch state indicating signal based on a comparison result of the drain-source voltage and the dynamic drain-source voltage threshold; and an on-control circuit, configured to provide a synchronous on signal to turn on the synchronous rectifier when the drain-source voltage decreases to the turn-on threshold, on the premise that the primary switch state indicating signal indicates an on state of the primary switch.
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