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TI's new compact gate drivers boast high-density switching

10 May 2012

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Texas Instruments Inc. (TI) has announced the introduction of its first 4-A/8-A and 4-A/4-A single-channel, low-side gate drivers. The drivers have drive current capability for minimizing switching loss of MOSFETs, IGBT power devices and wide band-gap power semiconductors such as gallium nitride (GaN) devices.

The company boasts that the UCC27511 and UCC27517 drivers are part of TI's new UCC2751x family and are meant to replace discrete gate driver circuits that use bipolar junction transistors. The gate drivers significantly improve 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 new UCC27xxx drivers complement TI's leading PWM controllers, such as UCC28250, UCC28950, LM5045, LM5046 and LM5035.

Key technical features of UCC27511 and UCC27517 tout the following advantages:

 • High current drive capability increases reliability: 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.
 • Fastest switching speed: Both drivers have a fast typical propagation delay of 13ns (ns) and a 9-ns/7-ns rise and fall time, providing an extremely low pulse distortion.
 • Minimal switching loss: 0.375Ω (0.5Ω 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.
 • Design flexibility: Supports 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 now available in a 6-pin SOT-23 package with a suggested resale price of $0.60 each in 1,000-unit quantities. The UCC27517, meanwhile, 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 within this second quarter of 2012 in 3-mm x 3-mm, 6-pin WSON packages and different CMOS input thresholds.

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