a PWM generator and current compensation IC controlling {HEAD ~ the duty cycle} of {TAIL ~ the electronic switch} and having 
of
a PWM generator and current compensation IC controlling { HEAD ~ the duty cycle } of { TAIL ~ the electronic switch } and having
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH