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