Rohm Semiconductor has introduced a new reference design that can control two commonly used power converter types— critical conduction mode (CCM) power factor correction (PFC) and quasi-resonant flyback —in consumer and industrial power supply applications with a single microcontroller (MCU). The PFC + flyback control reference design is part of the company’s LogiCoA power supply solution that uses an analog-digital hybrid control technology, which combines an analog-controlled power stage circuit with Rohm’s silicon MOSFETs and gate driver ICs and a digitally managed power supply circuit built around the low-power LogiCoA MCU.

REF67004 PFC + flyback control reference design (Source: Rohm Semiconductor)

The new REF67004 builds on the previous REF66009 LogiCoA power supply reference design that uses a non-isolated buck converter circuit. The new reference design features an AC input using a CCM PFC converter, followed by a quasi-resonant flyback converter to deliver a regulated DC 24-V output. Both reference designs use the LogiCoA ML62Q2035 MCU.

Key features of the REF67004 reference design include a calibration function that compensates for variations in the external component characteristics, enabling the LogiCoA MCU to perform high-precision voltage configuration and overcurrent protection. This enables the use of more compact (low power) power devices and inductors, which helps reduce printed-circuit-board area and lower overall system costs, according to Rohm.

The REF67004 also includes a logging function that allows the LogiCoA MCU to store operational data, such as input/output voltage, current, temperature, pre-shutdown system status, and cumulative operating time, in its built-in non-volatile memory. This data can be analyzed to identify the root cause of power supply failures.

In addition, various power control parameters and operational history can be configured and retrieved from a PC via UART (with a signal conversion device) using sample programs, including the real-time micro operating system (RMOS) power control OS, available on Rohm’s website.

Applications include industrial robots, semiconductor manufacturing equipment, and gaming devices. The LogiCoA power supply solution also can be used in general industrial equipment and consumer devices with power requirements ranging from about 50 W to 1 kW.

Reference design boards, reference boards, and LogiCoA MCUs are available for purchase through Rohm’s authorized online distributors including DigiKey, Mouser, and Farnell (reference design board). These include the LogiCoA003-EVK-001 and LogiCoA001-EVK-001 reference design boards, RB-D62Q2035TD20 and RB-D62Q2045GD24 reference boards, and ML62Q2035-NNNTDZWATZ and ML62Q2045-NNNGDZW5BY LogiCoA MCUs.

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