The pre-regulator functions in a similar fashion to provide line and
load regulation.
The series pass stage, in addition to giving the CD Series its tight
regulation characteristic , reacts rapidly to line and load changes
to Produce a transient response characteristic similar to the linear
series pass types.
With a relatively constant
voltage across the series pass stage more efficient use is made
of series transistor capacity, and hence ,the pre-regulator approach
yields a four or five-to one reduction in the number of series pass
transistors. |