PFC (Power Factor Correction)+LLC (Resonant Converter) is an efficient and high power density AC-DC power architecture widely used in the design of medium to high power supplies. Its core advantages lie in:

PFC stage: Adopting Boost boost topology, the rectified AC power is boosted to a stable high voltage, improving power factor and reducing harmonic interference in the power grid. LLC level: Based on half bridge resonant topology, utilizing zero voltage switching and zero current switching technology, high-frequency soft switching is achieved, reducing switching losses and achieving an efficiency of over 95%.

Key features: High efficiency: LLC soft switch+PFC optimization, overall efficiency>94%. High power density: high-frequency (100kHz-1MHz) reduces the volume of magnetic components and is suitable for gallium nitride (GaN)/silicon carbide (SiC) devices. Integrated control: Modern solutions integrate PFC+LLC controllers to simplify design. This architecture has become the mainstream choice for power supplies above 200W due to its high efficiency and compact features. Its internal composition diagram is shown below:

Typical product applications: Fast charging adapters, such as 140W gallium nitride chargers; Industrial power supply: servers, communication equipment; LED driver: High power constant current output; Home appliances/medical: TV, monitor power supply. The recommended products for this type of product by Asic Microelectronics are shown in the following figure: