TDA5142T schematic block diagram and typical applications

The basic structure and working principle are shown in Figure 3-43.
  The main include commutation logic, driver output stage, back electromotive force comparator, and independent operational
  amplifier ( OTA ). There are also starting oscillators , adaptive commutation delay circuits, and timers ,
  which can be set by external capacitors. In addition, there is a speed output stage and an
  overheating protection circuit.