CONTROL CIRCUIT WITH HYSTERESIS CONTROL FOR SWITCHING CONVERTERS AND CONTROL METHOD THEREOF
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United States of America Patent
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Issued Date -
Nov 30, 2023
app pub date -
Aug 14, 2023
filing date -
Aug 22, 2022
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Abstract
A controller for a switching converter has a hysteresis generating circuit to provide an upper hysteresis limit and a lower hysteresis limit based on an output voltage, a switching control circuit for providing a switching control signal, and a frequency locking circuit for adjusting one of the upper hysteresis limit and the lower hysteresis limit based on the switching control signal and a clock signal. When the switching converter is in a first mode, a main switch of the switching converter is turned ON by comparing a current sense signal representative of a current flowing through the main switch with the lower hysteresis limit, and is turned OFF by comparing the current sense signal with the upper hysteresis limit. When the switching converter is in a second mode, the main switch is turned ON based on the clock signal, and is turned OFF based on the current sense signal.
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