The UCC27511 and UCC27517 drivers, part of TI’s new UCC2751x family, effectively replace discrete gate driver circuits that use bipolar junction transistors, significantly improving efficiency, reliability and power-density in applications, such as off-line isolated power supplies, telecom modules, air conditioner systems, UPS and portable power tools.
The UCC27511 supports drive current capability up to 4-A source/8-A sink, while the UCC27517 supports a 4-A source/sink peak-current pulses. Both drivers have a fast typical propagation delay of 13 nanoseconds (ns) and a 9-ns/7-ns rise and fall time, providing a low pulse distortion. 0.375 ohm (0.5 ohm for UCC27517) pull-down resistance minimizes switching loss as the power switch transitions through the Miller Plateau and improves immunity to Miller turn-on events. The devices support 4.5-V to 18-V operating voltages and electrical parameters ensured across -40C to 140C. Maximum input voltage independent of VDD simplifies bias supply architecture.
The UCC27511 is available in a 6-pin SOT-23 package with a suggested resale price of $0.60 each in 1,000-unit quantities. The UCC27517 is available in a 5-pin SOT-23 package with a suggested resale price of $0.49 each in 1,000-unit quantities. TI plans to introduce additional single-channel gate drivers in the second quarter in 3-mm x 3-mm, 6-pin WSON packages and different CMOS input thresholds.