UCC21759-Q1
SLUSEB4A – AUGUST 2020 – REVISED DECEMBER 2020
www.ti.com
8 Detailed Description
8.1 Overview
The UCC21759-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 990V DC operating voltage based on SiC MOSFETs
and IGBTs, and can be used to above 10kW applications such as HEV/EV traction inverter, motor drive, on-
board and off-board battery charger, solar inverter, etc. The galvanic isolation is implemented by the capacitive
isolation technology, which can realize a reliable basic isolation between the low voltage DSP/MCU and high
voltage side.
The ±10A peak sink and source current of UCC21759-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 device can support up to 700-VRMS working voltage with longer than 40
years isolation barrier life, 6-kVPK surge immunity. The strong drive strength helps to switch the device fast and
reduce the switching loss, and the 150V/ns minimum CMTI guarantees 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 12V output side power supply UVLO is suitable for switches with
gate voltage ≥ 15V. The active Miller clamp feature prevents the false turn on causing by Miller capacitance
during fast switching. The device has the state-of-art DESAT detection time, and fault reporting function to the
low voltage side DSP/MCU. The soft turn off is triggered when the DESAT fault is detected, minimizing the short
circuit energy while reducing the overshoot voltage on the switches.
The isolated analog to PWM sensor can be used as switch temperature sensing, DC bus voltage sensing,
auxiliary power supply sensing, etc. The PWM signal can be fed directly to DSP/MCU or through a low-pass-filter
as an analog signal.
Copyright © 2020 Texas Instruments Incorporated
26
Submit Document Feedback
TI [ TEXAS INSTRUMENTS ]
