DCM is much popular for SMPS design because of its simple transfer function characteristic
and good line and load regulation. Most importantly the maximum output power can be set at a constant
value and no power overshoot during fault. However, CCM can provide the higher efficiency which is
required by more and more applications. In CCM operation, both of the peak current and RMS current are
lower than that of DCM operation. Although its overload protection threshold varies with the input voltage,
CCM operation is still attractive for the applications with high efficiency requirement.