Improving COT regulators with flywheel current injection

Keywords: COT regulator  flywheel current injection  hysteretic converter 

The constant on-time (COT) regulator is a modified version of the typical hysteretic converter, where a typical hysteretic converter turns on the main switch for a fixed interval of time whenever the output voltage drops across the reference voltage. However, COT regulators need tens to hundreds milliΩ of an output capacitor's equivalent series resistance (ESR) to provide stable voltage output. This is where the flywheel current injection control approach comes in as a good alternative.

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