The UCC21521 is an isolated dual-channel gate driver with 4-A source and 6-A sink peak
current. It is designed to drive power MOSFETs, IGBTs, and SiC MOSFETs up to 5-MHz with
best-in-class propagation delay and pulse-width distortion.
The input side is isolated from the two output drivers by a
5.7-kVRMS reinforced isolation barrier, with a minimum of 100-V/ns
common-mode transient immunity (CMTI). Internal functional isolation between the two secondary-side
drivers allows a working voltage of up to 1500 VDC.
This driver can be configured as two low-side drivers, two high-side drivers, or a
half-bridge driver with programmable dead time (DT). The EN pin pulled low shuts down both outputs
simultaneously and allows for normal operation when left open or pulled high. As a fail-safe
measure, primary-side logic failures force both outputs low.
The device accepts VDD supply voltages up to 25 V. A wide input VCCI range from 3 V to 18
V makes the driver suitable for interfacing with both analog and digital controllers. All the
supply voltage pins have under voltage lock-out (UVLO) protection.
With all these advanced features, the UCC21521 enables high efficiency, high power
density, and robustness in a wide variety of power applications.
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