ROHM has developed external FET-type controller ICs utilizing PWM current control mode optimized for AC-DC power supply in various industrial applications.

Accordingly, mass production has begun for four variants designed to drive a wide range of power semiconductors. Among them are the BD28C55FJ-LB for low-voltage MOSFETs, BD28C54FJ-LB for medium- to high-voltage MOSFETs, BD28C57LFJ-LB for IGBTs, and BD28C57HFJ-LB for SiC MOSFETs.

Presently, the global semiconductor shortage is beginning to ease. However, the supply of semiconductor components for power supplies in industrial applications continues to lag behind demand. This is particularly true for PWM controller ICs, where the limited number of manufacturers has resulted in chronic shortages. Thus, leading to numerous requests for product development.

For that reason, ROHM has developed PWM controller ICs that address the ongoing supply issue. Specifically, meeting the industrial market’s stringent package and performance requirements.

Boosts Performance, Reliability of Industrial Equipment

Depending upon the input AC voltage range of the application, a wide variety of semiconductors for power supply circuit. Each of these semiconductors demand different undervoltage lock out levels to prevent thermal runaway in case of supply/gate voltage drop. To solve this issue, ROHM has developed 4 variants with different undervoltage lock out levels.

The new products feature an input voltage range of 6.9V to 28.0V, circuit current up to 2.0mA, maximum startup current of 75µA, and a maximum duty cycle of 50%, offered in the standard SOP-J8 package (equivalent to the JEDEC SOIC8). The products are pin to pin compatible to standard products commonly used in power supply circuits. Therefore, reducing re-design and modification efforts.

All variants come equipped with a self-recovery-type undervoltage lockout function (UVLO) with voltage hysteresis. Therefore, improving application reliability by reducing the threshold voltage error to ±5%, compared to the typical ±10% of standard products.

At the same time, these ICs are suitable for long-term supply. Thus, ensuring continuous operation of long-life industrial equipment. In addition, the lineup will be further expanded to include products suitable to drive high-voltage MOSFETs and GaN devices. More variants to support a maximum duty cycle of 100% are also being planned.

11 October 2024