The UCC28019A 8-pin active Power Factor Correction (PFC) controller uses the boost
topology operating in Continuous Conduction Mode (CCM). The controller is suitable for systems in
the 100 W to >2 kW range over a wide-range universal ac line input. Start-up current during
undervoltage lockout is less than 200 μA. The user can control low power standby mode by pulling
the VSENSE pin below 0.77 V.
Low-distortion wave shaping of the input current using average current mode control is
achieved without input line sensing, reducing the external component count. Simple external
networks allow for flexible compensation of the current and voltage control loops. The switching
frequency is internally fixed and trimmed to better than ±5% accuracy at 25°C. Fast 1.5-A peak gate
current drives the external switch.
Numerous system-level protection features include peak current limit, soft over-current,
open-loop detection, input brown-out, and output over/undervoltage. Soft-start limits boost current
during start-up. A trimmed internal reference provides accurate protection thresholds and a
regulation set-point. An internal clamp limits the gate drive voltage to 12.5 V.
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