External Ramp Autotuning for Current Mode Control of Switching Converter
In this invention, a novel external ramp autotuning solution for the current mode control of switching converters is proposed. Conventionally, using fixed external ramp needs to be based on the worst-case condition, while prior adaptive ramp compensation strategies cannot adapt to component tolerance and topology change. Therefore, using either approach, the overall performance suffers from over compensation. Tuning external ramp slope to track the constant quality factor of double pole at half of switching frequency is proposed, and then stable and wide bandwidth performance over all possible duty cycle variation, component tolerance, and topology change is achieved without suffering the worst case design. Simple digital and analog implementations are proposed to realize the autotuning method into commercial current-mode controllers with peak current mode, valley current mode, and average current mode operation.
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