A controller regulates {HEAD ~ the output power} by controlling {TAIL ~ the switching frequency} based on a feedback signal that is coupled to the load 
A controller regulates { HEAD ~ the output power } by controlling { TAIL ~ the switching frequency } based on a feedback signal that is coupled to the load
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH