Development of the BD7F series for industrial equipment inverters
Simultaneously realizing miniaturization, low power consumption, and high reliability

ROHM Co., Ltd. announced that it has developed the BD7F series of isolated flyback DC/DC converter control ICs for use in high-power industrial equipment inverters such as solar inverters, FA inverters, and power storage systems.

Most electronic devices incorporate insulation features to protect both the human body and the system. Industrial equipment that handles high-voltage, high-power power, such as solar inverters and storage systems, which are becoming increasingly widespread, are no exception.


▲ This product eliminates the need for a photocoupler, enabling high reliability and miniaturization. Isolated power stabilization is possible with a single resistor, without the need for a photocoupler.

For these industrial devices, the need for reliability is increasing due to increasingly demanding operating conditions, such as long-term continuous operation and high-temperature operation. While many components, such as photocouplers, have been used in the control components of isolated power supplies, improvements in reliability, including circuit size and aging, are now required.

Previously, photocouplers were used for flyback-type isolated power control, but there were many problems in terms of current consumption, temperature change, and lifespan. However, the BD7F series (BD7F100HFN-LB / BD7F100EFJ-LB / BD7F200HFN-LB / BD7F200EFJ-LB) reduces the number of parts for flyback construction by about 50% by eliminating these photocouplers.



Accordingly, the company stated, "We can simultaneously achieve system miniaturization, power saving, and high reliability," and added, "By adopting the newly developed adaptive on-time control, we have improved the load response characteristics, which was an issue for isolated power control ICs. This product contributes to improved reliability by realizing voltage fluctuations of less than 200 mV.

This series began shipping samples (sample price 700 yen/unit: tax not included) in July 2016, and mass production is scheduled to begin in October 2016 with a monthly production capacity of 500,000 units.