Methods and apparatus for a spread spectrum switching regulator
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United States of America Patent
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Sep 29, 2009
Grant Date -
Jun 12, 2008
app pub date -
Nov 20, 2006
filing date -
Nov 20, 2006
priority date (Note) -
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Abstract
A spread spectrum switching regulator generally includes an reactive circuit portion coupled to the input terminal, a switching element coupled to the reactive circuit portion, and a control circuit portion coupled between the switching element and the output terminal. The switching element has a drive signal characterized by a duty cycle, and the reactive circuitry portion is configured to produce an output voltage at the output terminal responsive to the duty cycle of the drive signal. The control circuit portion is configured to spread the input power across multiple frequencies by adjusting the drive signal of the switching element, thereby reducing input current noise through spread spectrum techniques. The drive signal is responsive to a pseudo-randomly generated ramp signal.
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