ST Launches CCM PFC Controller 'L4983'

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ST Launches CCM PFC Controller 'L4983'

Published2026.09.14 12:03

Minimized External Components Through Built-in Multiplier Emulator

STMicroelectronics (hereinafter ST) has launched the L4983 Power-Factor Correction (PFC) controller with built-in Multiplier Emulator and distortion optimization circuitry. It enables implementation of Continuous Conduction Mode (CCM) PFC circuits with minimal external passive components, and is characterized by three power-saving modes and various protection functions.

ST unveiled the L4983 on the 14th. This controller is suitable for power supplies ranging from hundreds of watts to several kilowatts and provides Totem-Pole output with 7A sink/3A source capacity.

It supports applications including consumer, industrial, and medical power supplies, high-power lighting equipment, servers, and PCs that must meet global specification requirements including EN 61,000-3-2 and Japanese JEIDA-MITI standards.

The L4983 offers three power-saving modes—△Burst Mode △Pin-Controlled Idle Mode △Disable Mode—to meet efficiency guidelines including U.S. Energy Star, EU Ecodesign Directive, and European Code of Conduct for power adapters.

Burst Mode automatically stops switching operation under light-load or no-load conditions and rapidly resumes when load increases without soft restart.

Idle Mode suspends switching operation while simultaneously shutting down the internal error amplifier, and Disable Mode restarts operation through soft-start after stopping.

Protection functions include △Overvoltage Protection △Cycle-by-Cycle Overcurrent Protection △Inductor Saturation Detection △Line Feedforward △Inrush Current Limiting through Soft Start.

ST states that voltage feedback and current sensing signals are verified at startup to protect the system from feedback loop faults.

ST also provides the EVL4983-350W demo board to support power supply development based on the L4983.

This board delivers 400Vdc regulated output across the universal input voltage range, maintains low Total Harmonic Distortion (THD) across the full load range, and achieves 97.4% efficiency.

The L4983 is available in two variants: △L4983A with 65kHz switching frequency △L4983B with 130kHz.

Both products are manufactured in SO-8 lead package and are available from $0.80 per unit for purchases of 1,000 units.

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