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