ROHM Unveils Compact PFC + Flyback Power Supply Reference Design with LogiCoA Technology

ROHM has introduced the REF67004, a new reference design that integrates Critical Conduction Mode Power Factor Correction (PFC) and Quasi-Resonant Flyback converters, controlled by a single LogiCoA MCU. This design is part of ROHM’s LogiCoA Power Supply Solution, which combines analog-digital hybrid control technology, utilizing ROHM’s silicon MOSFETs, gate driver ICs, and a low-power LogiCoA MCU.

The REF67004 boosts AC input through a PFC converter and delivers a regulated 24V DC output via a Quasi-Resonant Flyback converter. It includes a calibration function to adjust for variations in external components, enabling precise voltage configuration and overcurrent protection. This reduces design margins, allowing the use of compact, low-power components and inductors, which minimizes PCB area and system costs. The design also features a logging function, storing operational data such as input/output voltage, current, temperature, pre-shutdown status, and cumulative operating time in the MCU’s non-volatile memory for failure analysis. Parameters and operational history can be configured and retrieved via UART using sample programs, including the RMOS power control OS, available on ROHM’s website. The LogiCoA003-EVK-001 reference design board ...