CONSTANT ON-TIME SWITCHING CONVERTERS WITH ULTRASONIC MODE AND CONTROL METHODS THEREOF
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United States of America Patent
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Issued Date -
Jun 29, 2017
app pub date -
Oct 19, 2016
filing date -
Dec 28, 2015
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Abstract
A constant on-time switching converter includes a switching circuit, a comparing circuit, a mode determination circuit, an on-time control circuit and a logic circuit. The switching circuit has a first switch and converts an input voltage into an output voltage. The comparing circuit compares the output voltage with a reference voltage and generates a first setting signal. The mode determination circuit generates a second setting signal indicating whether the switching frequency of the switching circuit approaches an audible range. The on-time control circuit generates an on-time control signal. The logic circuit generates a control signal for controlling the first switch based on the on-time control signal, the first setting signal and the second setting signal. When the switching frequency approaches the audible range, the second setting signal transits from a first state to a second state, the first switch is turned ON.
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