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TI unveils new family of LLC controllers

Texas Instruments has introduced an inductor-inductor-capacitor (LLC) resonant controller with an integrated high-voltage gate driver that delivers, according to the company, the industry’s lowest standby power, as well as longer system lifetimes.

The UCC256301 has been designed to provide a cost-effective system solution that helps meet stringent energy-efficiency standards for a wide range of AC/DC applications, including digital televisions, gaming adapters, desktop computer and notebook adapters, and power-tool battery chargers.

The first in a family of new high-performance LLC controllers, the UCC256301 enables standby power of less than 40mW when fully regulating the system output, while also performing better than industry efficiency requirements. By delivering the fastest transient response plus robust fault-protection features such as zero current switching avoidance, the device is intended to provide a more reliable operation over end-equipment lifetimes.

Key features and benefits of the device include: high efficiency and the lowest standby power (the controller exceeds Code of Conduct (CoC) Tier 2 and U.S. Department of Energy (DoE) Level VI efficiency standards and achieves more than 90% efficiency with a 10% load); a newly patented hybrid hysteretic control method that enables up to 10 times faster transient response and reduces output capacitance by 20%, an extended system lifetime and a simplified design. Engineers can more easily design their systems with the integrated X-capacitor discharge and high-voltage start-up features.

The UCC256301 is the latest addition to TI’s high-voltage portfolio of end-to-end power-conversion solutions delivering high efficiency. In addition to the UCC256301, the new portfolio of LLC controllers includes the UCC256303, which works easily with an external bias, and the UCC256304, which supports wide input ranges.

Engineers can pair the UCC256301 with a TI power factor correction controller and synchronous rectifier controller to increase system efficiency. To meet a variety of power levels, PFC controllers include the UCC28180, UCC28063, UCC28051 and UCC28070. The UCC24610 SR controller can also be paired with the UCC256301 to further improve efficiency.

Author
Neil Tyler

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