Adaptive slope compensation for current mode switching power supply
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United States of America Patent
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Feb 20, 2018
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N/A
app pub date -
Feb 1, 2017
filing date -
Feb 1, 2017
priority date (Note) -
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Abstract
A current mode switching converter includes a transistor switch, an inductor configured to conduct a ramping inductor current as the transistor switch is turned on and off at a particular duty cycle, and an inductor current sensor generating a current sense signal. The current sense signal has an up-slope portion and a down-slope portion. A separate ramp generator generates a ramp voltage for each switching cycle. A slope compensation circuit compensates the ramp voltage, depending on the duty cycle and other factors, to create a compensated ramp voltage. The compensated ramp voltage is then summed with the current sense signal to create a compensated current sense signal for a comparator. The slope compensation circuit forces the compensated current sense signal to have an up-slope greater than an absolute value of its down-slope at least for duty cycles greater than 50% to rapidly dampen perturbations in the duty cycle.
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