Southchip announced the launch of its high-efficiency AC-DC power platform solution, consisting of multi-mode PFC and current-mode LLC digital combo controller SC3270, alongside the high-power LLC SR controllers SC3530/SC3531. Targeting AI computing terminals, industrial power supplies, communication power systems, and other applications, the solution enables customers to build PFC+LLC+SR-based high-efficiency power systems.

In Southchip's newly launched high-efficiency AC-DC power platform solution, SC3270 handles digital control for the front-end PFC stage and back-end LLC stage, while SC3530/SC3531 manages synchronous rectification (SR) control. Working in tandem, the chipset covers the entire core control chain from power factor correction and isolated conversion to secondary-side synchronous rectification. The solution offers multiple drive voltage options to accommodate the driving requirements of third-generation wide-bandgap power devices such as SiC and GaN.

In AI computing terminals and edge computing equipment, system power consumption and thermal dissipation pressures continue to escalate, demanding higher efficiency and lower losses within confined spaces. The combination of SC3270 and SC3530/SC3531 helps customers optimize front-end AC-DC conversion efficiency, reduce critical power-stage losses, and provide a stable power foundation for downstream DC-DC converters and loads.

In industrial power supplies, communication power systems, and high-performance adapters – where product variants are numerous, power ratings are widely distributed, and development cycles are tight – there is a heightened need for flexible parameter configuration, comprehensive protection, and strong platform reusability. The digital configurability and multi-mode control capabilities of SC3270 empower customers to adopt a platform-based development approach, accelerating adaptation to diverse voltage and power-level application scenarios.

SC3270 is a multi-mode PFC and current-mode LLC digital combo controller programmable via a UART interface. The controller integrates a high-voltage startup circuit and drivers, achieving low standby power consumption and efficiency optimization across the entire operating range.

For PFC control, SC3270 employs a peak current control architecture combined with MOSFET current sensing to acquire switching current information. Compared with conventional inductor current sensing schemes, this approach reduces losses in the sensing path and mitigates thermal issues associated with sense resistors. Meanwhile, SC3270 supports mixed CCM/QR/DCM operation modes, automatically optimizing operating states based on input voltage, load conditions, and system power requirements. By combining low-loss sensing with multi-mode adaptive control, SC3270 strikes a superior balance among light-load efficiency, full-load current ripple, power factor, and system temperature rise, enabling customers to build high-efficiency PFC platforms covering medium to high power ranges.

In LLC control, SC3270 further demonstrates its high-integration advantages. Traditional current-mode LLC control schemes typically require an external resonant capacitor voltage detection branch to acquire the resonant voltage information needed for control. SC3270 internally synthesizes resonant voltage from current information, eliminating one external resonant voltage sampling path. This reduces BOM count, simplifies PCB layout, and minimizes the design complexity associated with high-frequency, high-voltage sampling networks.

Thanks to the streamlined peripheral circuitry, SC3270 can repurpose the saved pin resources for independent secondary over-voltage and under-voltage protection. This protection creates a redundant monitoring mechanism alongside the main feedback loop, providing an additional safety barrier under abnormal conditions such as feedback faults, output over-voltage, or system runaway, thereby significantly enhancing overall system protection integrity and reliability. For application scenarios such as AI computing terminals, server power supplies, and communication power systems that demand high safety and long-term stability, SC3270 not only contributes to improved efficiency and power density but also helps customers build more reliable power systems that are easier to reuse across platforms.

SC3530/SC3531 are industrial-grade synchronous rectification controllers for medium-to-high-power LLC converters. By replacing Schottky diodes with low on-resistance MOSFETs, they significantly reduce conduction losses and improve overall system efficiency. The series supports dual-channel driving and nanosecond-fast turn-off, helping to prevent reverse current flow and enhancing rectification efficiency and system reliability from light to heavy loads. With self-adaptive on/off control and simplified peripheral design, SC3530/SC3531 enable customer to rapidly build high-efficiency LLC secondary-side rectification solutions, helping end systems meet the more stringent requirements for efficiency, thermal performance, and power density demanded by AI computing terminals and industrial power applications.