Switched converter with variable peak current and variable off-time control
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United States of America Patent
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May 5, 2009
Grant Date -
Jun 28, 2007
app pub date -
Dec 27, 2005
filing date -
Dec 27, 2005
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A converter coupled to a DC voltage input and connectable to a load, includes a signal responsive switch coupled between a first circuit point and a second circuit point. In lieu of burst mode operation during low load conditions, the peak switch current is varied directly with load condition and a switch deactivation interval is varied inversely with load condition. The switch deactivation level is within a maximum level to avoid audio frequency band interference, while maintaining high efficiency operation throughout the load range.
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