Frequency jitter generator and PWM controller
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United States of America Patent
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-
Dec 21, 2010
Grant Date -
Dec 10, 2009
app pub date -
Dec 31, 2008
filing date -
Jun 6, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A frequency jitter generator and a frequency jitter PWM controller are provided for overcoming the shortcoming that a conventional PWM controller reduces the electromagnetic interference issue by means of varying the operating frequency of the PWM controller based on an input voltage, while resulting in the uncertainty of the range of frequency jitter and the difficulty circuit design due to the effect of the input voltage and the load. The frequency jitter generator and PWM controller adjust the range of frequency jitter by using a signal within a fixed voltage range. The invention not only gets rid of the effect of the input voltage and the loading, but also simplifies the circuit design by fixing the range of frequency jitter no greater than a predetermined percentage regardless of the operating frequency of the PWM controller.
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