Designed for consumer and industrial power supplies, it delivers precise voltage regulation, overcurrent protection, and operational logging, helping engineers reduce PCB size and system costs.
The new reference design is a valuable tool for design engineers, simplifying the development of power supply systems by combining analog efficiency with digital precision. By integrating control of both PFC and flyback converters into a single MCU, it reduces design complexity and accelerates prototyping. Engineers can leverage its calibration, overcurrent protection, and data-logging features to optimize component selection, improve reliability, and minimize PCB footprint, ultimately cutting development time and lowering system costs.
ROHM has introduced a new reference design REF67004 under its LogiCoA brand, reflecting the company’s hybrid analog-digital approach to power supply solutions. The LogiCoA philosophy combines the precision and flexibility of digital control with the efficiency and reliability of analog circuitry, enabling optimized performance across various power topologies and applications.
Recently, ROHM launched the REF67004 reference design, capable of controlling two widely used power converter types—Critical Conduction Mode (CCM) Power Factor Correction (PFC) and quasi-resonant flyback—using a single LogiCoA MCU. This design follows the earlier REF66009 buck converter reference design and forms part of ROHM’s broader LogiCoA Power Supply Solution. The REF67004 is intended for consumer and industrial power supply applications and demonstrates the company’s hybrid control technology by integrating analog-controlled power stages with digital MCU-based management.
The reference design features AC input boosting through a CCM PFC converter and a quasi-resonant flyback stage to deliver a regulated 24V DC output. Key functionalities include a calibration function that compensates for variations in external components, allowing high-precision voltage control and overcurrent protection. The design reduces the need for oversized components, enabling more compact power devices and inductors, and helps minimize PCB area while lowering overall system costs. Additionally, it includes a logging function for operational data—such as voltage, current, temperature, system status, and cumulative runtime—which can be stored in the MCU’s non-volatile memory and accessed via UART using sample programs.
Along with the reference design board (LogiCoA003-EVK-001), ROHM provides comprehensive support materials, including circuit diagrams, PCB layouts, parts lists, and evaluation software. Users can perform practical assessments of various power topologies using this reference design. Full details, documentation, and the design itself are available on ROHM’s website: LogiCoA Power Supply Solution. ROHM continues to expand its lineup of reference designs to support faster and more efficient development of consumer and industrial power supplies.
ROHM Semiconductor has tested this reference design. It comes with a bill of materials (BOM), schematics, assembly drawing, printed circuit board (PCB) layout, and more. The company’s website has additional data about the reference design. To read more about this reference design, click here.
