Resonant controller targets industry lowest standby power
The UCC256301 helps meet 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.
This is the first in a family of LLC controllers and enables standby power of less than 40 mW when fully regulating the system output, while also performing better than industry efficiency requirements. With a fast transient response and robust fault-protection features such as zero current switching avoidance, the device enables reliable operation over end-equipment lifetimes. It uses a hybrid hysteretic control, a new patented control method that enables up to 10 times faster transient response and reduces output capacitance by 20 percent.
“The consumer electronics market demands efficient power supplies with low standby power. With this new family of LLC controllers, TI is enabling designers to do more with less power,” said Steve Lambouses, TI vice president, High Voltage Power. “The UCC256301 was designed to meet tomorrow’s power requirements by delivering breakthroughs in standby power and efficiency while simplifying design and lowering system cost.”
The standby power means the controller exceeds Code of Conduct (CoC) Tier 2 and US Department of Energy (DoE) Level VI efficiency standards and achieves more than 90 percent efficiency with a 10 percent load. The family 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 (PFC) controller and synchronous rectifier (SR) controller to increase system efficiency. PFC controllers include the UCC28180, UCC28063, UCC28051 and UCC28070. The UCC24610 SR controller can also be paired with the UCC256301 to further improve efficiency.
Support tools for the UCC256301 include the UCC25630-1EVM-291 evaluation module, WEBENCH Power Designer and SIMPLIS transient models as well as a 480W AC-DC Industrial Reference Design and 450W AC-DC Reference Design with Single-Layer PCB. The UCC256301 is available now in a small-outline integrated circuit (SOIC)-16 package and is priced at US$0.99 in 1,000-unit quantities.
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