Controller improves power efficiency in CE, AC adapters

Texas Instruments Inc. announced at the recent Applied Power Electronics Conference a green-mode power management circuit that aims to improve energy efficiency in consumer electronic systems and AC power adapters.

The 8-pin, quasi-resonant, UCC28600 green-mode controller is said to provide high power efficiency in full and light-load operating conditions and decreases power consumption in no-load standby mode. It also aims to improve power efficiency in notebook PC and gaming system AC adapters that support 40W to 200W.

The UCC28600 is a flyback, pulse-width modulation device that is said to meet the U.S. Environmental Protection Agency's Energy Star power requirements for consumer electronic systems. The controller implements quasi-resonant control techniques, frequency fold-back operation in light load conditions and features a dedicated pin to disable the power factor correction stage in standby operation. The UCC28600 also integrates protection features for power supplies up to 200W, including cycle-by-cycle power limit and over-current hiccup re-start mode.

The UCC28600 comes in an 8-pin SOIC package. It is currently sampling, and volume production is expected in the second quarter. Suggested resale pricing in quantities of 1,000 is Rs.21.68 (49 cents).