L4984 Overview
9 4 Typical electrical performance . 12 5 Application information . 16 5.1 Theory of operation.
L4984 Key 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
L4984 Applications
- PFC pre-regulators for
- IEC61000-3-2 and JEIDA-MITI pliant SMPS in excess of 1 KW