What is the benefit of synchronous control of regulator switching frequency?
Synchronous control, or “synch frequency input,” offers a means of choosing a switching frequency using an external clock source. The choice of frequency could be crucial in EMI management. In addition, the synch input allows multiple switching regulators to use a common frequency by having a common input going to all of them or by self-synchronization (if available) where one switcher sets the frequency of the whole set. Having a common switching frequency allows for one common frequency band for EMI management. This avoids having to manage beat frequencies that can arise due to multiple frequencies in the system.
