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