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PFC Control Theory
Dimmable Light Ballast with Power Factor Correction, Rev. 1
Freescale Semiconductor 19
Figure 2-8. Generated Input Current Waveform
2.2.4 Concept Summary
Both the PFC solutions can be used for applications that do not require a large portion of the MCU’s
resources, because they consume only a fraction of the MCU performance. Compared to a dedicated IC
solution, digital PFC offers high flexibility and cost reduction in the overall design, as the PFC function can
be provided within the MCU capability of the main application. Digital PFC also provides additional
benefits such as a wide range of input voltages (85
V to 265 V AC) at a constant output DC voltage.
However, hysteresis current control mode is more suitable for power above 100W, and discontinuous
conduction mode for low power consumption.