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Details of Isolation Technology

All of ROHM’s isolated gate drivers are built using coreless transformer technology. The transformers use copper windings and a core of silicon dioxide, which is basically like quartz. Its melting point is above 1700°C. The chip shown here at the left is the “low voltage” interface circuit to the DSP or microcontroller. It operates from 5 V, but accepts signals at 3.3 V or 5 V levels. In the center is the island containing from one to four coreless transformers. On the right is the “high voltage” secondary side, which provides the drive to the IGBT or MOSFET. In ROHM's simple drivers, the transformers are used to relay information from primary to secondary, and only one transformer is needed. ROHM's complex gate drivers include up to four isolation transformers, permitting the DSP to monitor internal gate driver conditions.

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