Simple chip eases SiC into the mainstream

Rohm has introduced a silicon ac-dc controller chip for silicon carbide mosfets.

Rather than some multi-kW industrial motor drive, it is a simple 8pin ac-dc controller for 50W single-output designs.

“Until now there has not been a control IC that can sufficiently draw out the performance of SiC mosfets, particularly in ac-dc converter systems. As a result designers are faced with numerous problems related to power consumption and stability in a variety of high power applications,” claimed Rohm.

Called BD768xFJ, the firm is claiming a 6% efficiency gain over all-silicon designs, and no heatsink requirement in “50W-class power supplies”.

Included are protection functions that support operation at up to 690Vac, so it is suitable for general 400Vac industrial applications.

It is a quasi-resonant controller operating at up to 120kHz.

steve bush

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via Yuichun