L4984 CCM PFC controller Features ■ Line-modulated fixed-off-time (LM-FOT) control of CCM-operated PFC pre-regulators ■ Proprietary LM-FOT modulator for nearly fixedfrequency operation ■ Proprietary multiplier design for minimum THD of AC input current ■ Fast “bi-directional” input voltage feedforward (1/V2 correction) ■ Accurate adjustable output overvoltage protection ■ Protection against feedback loop failure (latched shutdown) ■ Inductor saturation protection ■ AC brownout detection ■ Digital leading-edge blanking on current sense ■ Soft-start ■ 1% (at Tj = 25 °C) internal reference voltage ■ - 600 / + 800 mA totem pole gate driver with active pull-down during UVLO and voltage clamp ■ ...

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