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