Asynchronous modulation synchronization principle
Integrated Inductive Switch-Mode Power Supply: Fondamentals on Feedback Control in Current Sliding Mode

Hysteretic or sliding-mode control generates a sharp variation in the converter's switching frequency during high-amplitude transients. As a result, the converter's Joule losses are difficult to predict if the transient character is more pronounced than the static operating character. What's more, and perhaps more annoyingly, the noise generated by the voltage converter is also virtually uncontrollable. Some applications, such as radio-frequency amplifiers , cannot tolerate it. On the other hand, applications such as powering digital circuits require highly variable but precise...