Low ripple line-state dependent PWM DCDC converter controllers and methods
for subscriber line interface circuit switching load regulation. In
accordance with the method, line state is monitored to determine the
target voltage for that state, and a DCDC converter is controlled
responsive to the line state and the difference between the actual line
voltage and the target voltage for that line state. The differences
between the actual line voltage and the target voltage for that line
state are split into different ranges, each range having a skip step size
and a step size associated therewith, the step size determining how many
equal pulse width pulses will be provided to the converter before the
pulse width is adjusted by the step size and the process repeated.
Apparatus for practicing the invention and variations thereof are
disclosed.