The UCC21737-Q1 device is an advanced isolated gate driver with state-of-art protection and sensing features for SiC MOSFETs and IGBTs. The device can support up to 2121-V DC operating voltage based on SiC MOSFETs and IGBTs, and can be used to above 10-kW applications such as HEV/EV traction inverter, motor drive, on-board and off-board battery charger, solar inverter, and so forth. The galvanic isolation is implemented by the capacitive isolation technology, which can realize a reliable reinforced isolation between the low voltage DSP/MCU and high voltage side.

The ±10-A peak sink and source current of the UCC21737-Q1 can drive the SiC MOSFET modules and IGBT modules directly without an extra buffer. The driver can also be used to drive higher power modules or parallel modules with external buffer stage. The input side is isolated with the output side with a reinforced isolation barrier based on capacitive isolation technology. The device can support up to 1.5-kV_RMS working voltage, 12.8-kV_PK surge immunity with longer than 40 years isolation barrier life. The strong drive strength helps to switch the device fast and reduce the switching loss, while the 150V/ns minimum CMTI ensures the reliability of the system with fast switching speed. The small propagation delay and part-to-part skew can minimize the deadtime setting, so the conduction loss can be reduced.

The device includes extensive protection and monitor features to increase the reliability and robustness of the SiC MOSFET and IGBT based systems. The 12-V output side power supply UVLO is suitable for switches with gate voltage ≥ 15 V. The active Miller clamp feature prevents the false turn on caused by Miller capacitance during fast switching. An external Miller clamp FET can be used, providing more versatility to the system design. The device has a state-of-art overcurrent and short circuit detection time, and fault reporting function to the low voltage side DSP/MCU. The soft turn off is triggered when the overcurrent or short circuit fault is detected, minimizing the short circuit energy while reducing the overshoot voltage on the switches.

The active short circuit feature can create a phase-to-phase short circuit for a three-phase inverter, which is useful for motor drive applications to protect the battery if the microcontroller loses control.