Cancellation of slope compensation effect on current limit
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United States of America Patent
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Dec 24, 2002
Grant Date -
N/A
app pub date -
May 23, 2000
filing date -
May 23, 2000
priority date (Note) -
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Abstract
A current-mode switching regulator that maintains a substantially constant maximum current limit over a virtually full range of duty cycles is provided. The regulator has a control circuit that includes a buffer circuit, an adjustable voltage clamp circuit, and a slope compensation circuit. The buffer circuit isolates a control signal from capacitive loading associated with control circuit. The threshold level of the adjustable voltage clamp circuit varies with respect to the amount of slope compensation provided to the voltage regulator. This allows a control voltage to increase as slope compensation increases so that a substantially constant maximum current limit is maintained.
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