Understanding the Right-Half-Plane Zero: Part 2 (.PDF download)

April 11, 2014
Analytical description of the right-half-plane zero for voltage-mode and current-mode converters.

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...........

Register or Sign in below to download the full article in .PDF format, including high resolution graphics and schematics when applicable.