ROHM launches four SOP package general-purpose AC-DC controller ICs ideal for industrial power supplies

~ Equipped with a high-precision undervoltage lockout function, a wide product lineup supports a variety of power transistors from Si-MOSFET to IGBT and SiC MOSFET ~

ROHM (headquartered in Kyoto, Japan), a world-renowned semiconductor manufacturer, has developed a PWM control method*1 FET external type general-purpose controller IC that is ideal for AC-DC power supplies for industrial equipment. Currently, four new products that support various power transistors have been put into mass production, including the "BD28C55FJ-LB" for low-voltage MOSFET driving, the "BD28C54FJ-LB" for medium- and high-voltage MOSFET driving, the "BD28C57LFJ-LB" for IGBT driving, and the "BD28C57HFJ-LB" for SiC MOSFET driving.

Although the global shortage of semiconductor products has gradually eased, power products used in industrial equipment and other applications are still in short supply. In particular, AC-DC controller ICs have become a long-term problem due to the small number of manufacturers, and the need for product development is increasing. Against this backdrop, ROHM is helping to address the supply shortage by launching PWM control AC-DC controller ICs that meet the high-demand packaging and performance requirements in industrial equipment applications.

The input voltage range of the new product is 6.9V to 28.0V, the maximum circuit current is 2.0mA, the maximum startup current is 75μA, the maximum duty cycle*2 is 50%, and it adopts the standard SOP-J8 (equivalent to the JEDEC standard SOIC8) package. The pin arrangement is the same as that of general products commonly used in industrial equipment power supplies, which helps to shorten the design cycle of circuit changes and new designs. All models of the new product support the self-recovery low voltage malfunction prevention function (UVLO)*3 with voltage hysteresis. Compared with the threshold voltage error of about ±10% of ordinary products, the threshold voltage error of the new product is smaller, only ±5%, achieving high-precision self-recovery startup, which helps to improve the reliability of application products.

Furthermore, the new products are long-term supply products, which can be stably supplied over a long period of time, thus helping long-life industrial equipment to continue to operate.

The new product has been put into mass production at a scale of 100,000 units per month since July 2024 (sample price 180 yen/unit, excluding tax). The production base for the front-end process is ROHM Hamamatsu Co., Ltd. (Hamamatsu City, Japan), and the production base for the back-end process is ROHM Electronics Philippines, Inc. (Philippines). In addition, the corresponding products have also begun e-commerce sales and can be purchased on the e-commerce platform Ameya360.

In the future, ROHM will gradually add products that support high-voltage MOSFET and GaN devices to its product lineup. It also plans to launch products that support a 100% maximum duty cycle.

＜Product Lineup＞

＜Application Examples＞

Industrial equipment: AC-DC power supplies, inverters for motor drives, and other applications powered from a power outlet

＜E-commerce sales information＞

Sales start time: July 2024

E-commerce platform: Ameya360

The new products will also be gradually released on other e-commerce platforms.

・Product Information

Product model: BD28C54FJ-LB, BD28C55FJ-LB, BD28C57HFJ-LB, BD28C57LFJ-LB

＜Terminology＞

*1) PWM control method

PWM (Pulse Width Modulation) is a power control method that uses semiconductors. The output power is controlled by changing the ratio of on-time to off-time within a certain period.

*2) Duty cycle

The ratio of time that a continuous pulse wave is in the on state or off state within a certain period. The ratio of the on state is called the "on duty cycle", and the ratio of the off state is called the "off duty cycle". Usually the duty cycle refers to the ratio of time in the on state.

Duty cycle (%) = pulse width (t) ÷ period (T)

*3) Self-recovery undervoltage lockout (UVLO) with hysteresis characteristics

UVLO is the acronym for "Under Voltage Lock Out". When the input voltage drops outside the threshold range, it is a function that safely stops the IC from operating before an abnormality occurs in the IC's internal circuit. When the voltage approaches the threshold voltage, the IC repeatedly stops and restarts, becoming unstable. Therefore, a protection circuit with hysteresis characteristics is used to provide a certain range of voltage when the IC stops and restarts.