Varying switching frequency and period of a power supply controller
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United States of America Patent
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Dec 17, 2013
Grant Date -
Jan 31, 2013
app pub date -
Jul 28, 2011
filing date -
Jul 28, 2011
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Abstract
An example integrated circuit controller for use in a switching power supply includes a pulse width modulation (PWM) circuit and a timing circuit. The PWM circuit controls a switch to regulate an output of the power supply in response to a switch current flowing through the switch and in response to a clock signal having a switching period. The timing circuit provides the clock signal and increases the switching period in response to an on time of the switch exceeding a threshold time.
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