At full drive, the converter is working in block mode, and in the rest of the modulation range {HEAD ~ the converter} is working in {TAIL ~ pulse mode} 
At full drive , the converter is working in block mode , and in the rest of the modulation range { HEAD ~ the converter } is working in { TAIL ~ pulse mode }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL