Reference voltage based equivalent series resistance (ESR) emulation for constant on-time (COT) control of buck regulators
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United States of America Patent
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Jul 2, 2013
Grant Date -
Apr 5, 2012
app pub date -
Sep 30, 2010
filing date -
Sep 30, 2010
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Abstract
The present invention uses a reference voltage that varies within a Pulse Width Modulation (PWM) cycle to generate the PWM signal. This allows for stability in the feedback of Constant On-Time (COT) control for buck controllers when low Equivalent Series Resistance (ESR) capacitors are used as the output capacitor. The reference voltage is adjusted using features of a PWM cycle in a voltage mode without using external inductor current information.
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