INTRODUCING THE UCC3570
The overall block diagram for the UCC3570 is shown in
Figure 1. While this architecture may look relatively
complex, it is not because of the pulse-width modulation
circuitry. Although this may be the heart of the controller,
it is implemented with only the comparator,
OR-gate, latch, and output driver shown across the
center of the diagram. Since the UCC3570 is intended
for isolated applications, there is no error amplifier, anticipating
that this function will be on the opposite side
of the isolation boundary.