Application Note

Power Factor Correction (PFC) is very much a necessity for off-line switchmode power supplies requiring output powers of 75 watts or more. Boost converters using discontinuous mode and critical conduction mode design approaches to PFC have been mostly relegated to the low power end of the power spectrum because of the low cost and simplicity of the circuitry. It turns out that the critical conduction mode approach offers the same simplicity and low cost for power factor correctors in the...