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