Dynamic ramp control in current-mode adaptive on-time control for Buck converter on chip

摘要

This paper proposes dynamic ramp control in current-mode adaptive on-time control for Buck converter on chip. It improves system stability and reduces output voltage at the load release. The concept of dynamic ramp control uses sample and hold circuit, comparator, and ramp valley control circuit adjusted according to the varied ramp signal to avoid the generation of an error pulse signal to regulate a high output voltage at the load release. Finally, the feasibility and performance of the integrated circuit implemented with dynamic ramp control are tested through experiments.