In the preferred embodiment, the controller generates {HEAD ~ a pulse width modulated signal} which is used to drive {TAIL ~ the transistor switch} 
is used to drive
In the preferred embodiment , the controller generates { HEAD ~ a pulse width modulated signal } which is used to drive { TAIL ~ the transistor switch }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL