In the first part of this article, it was found that the right-half-planze zero (RPHZ) presence forces the designer to limit the maximum duty-cycle slew rate by rolling over the crossover frequency. This is because the average inductor current cannot instantaneously change and is also slew-rate limited by the average transient voltage across the inductor. By clamping the duty-cycle speed of change, the designer offers a way to let the inductor build up at a pace where it can follow the output current increase demand. Failure to do so exposes the converter to instability. The second part of this series deals with...........
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