Method and apparatus for constant on-time switch mode converters
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United States of America Patent
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May 11, 2010
Grant Date -
Feb 11, 2010
app pub date -
Aug 8, 2008
filing date -
Aug 8, 2008
priority date (Note) -
Expired
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Abstract
The teachings presented herein provide a method and apparatus for operating constant on-time DC/DC converters, including pseudo constant on-time variants, with a virtual current-mode slope signal. Use of the slope signal provides, among other advantages and improvements, greater noise immunity and the ability to operate with a wider range of converter output filters. More particularly, incorporating a properly synchronized slope signal into the on-time triggering comparison provides for a maximum slope offset at on-time triggering. Doing so prevent double-pulsing (i.e., erroneous on-time retriggering) and other undesirable behavior of conventional constant on-time DC/DC converters and, as a particular but non-limiting advantage, allows ready and advantageous use of the slope-compensated converter as taught herein with low ESR capacitors in the output filter.
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