Method and apparatus for improved current mode control for large conversion ratio synchronous buck converter with lossless current sense
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United States of America Patent
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Mar 24, 2009
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N/A
app pub date -
Oct 26, 2006
filing date -
Oct 26, 2005
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Abstract
Methods and apparatuses are provided for monitoring an inductor output current delivered to a load by a power converter. For example, there is provided an apparatus comprising: at least one power switch operatively coupled to an input voltage source; an output inductor operatively coupled to the at least one power switch and to the load; and a current sensor operatively coupled to the output inductor, the current sensor providing a current sense signal corresponding to the inductor output current delivered to the load. In one embodiment, the current sensor comprises: a filter comprising a first resistor coupled in series with a first capacitor; and a second capacitor coupled in parallel with the first resistor, the first and second capacitors forming an AC voltage divider to increase the signal-to-noise ratio of the current sense signal.
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