PMICs boost digital TV

Dallas—Two power management chips from Texas Instruments—a dual-phase power factor correction (PFC) controller with Natural Interleaving technology and a new SWIFT DC/DC power management converter—help increase energy efficiency and reduce system size and cost for digital TV (DTV) systems.

Digital TVs using liquid crystal displays, reportedly the fastest growing segment in the DTV market, require 35 percent more power to operate than TVs using cathode ray tubes, according to TI. The company's UCC28061 PFC controller, an update to the UCC28060, is designed to facilitate the thinnest LCD TV designs by incorporating smaller EMI filters, smaller or fewer output capacitors, and smaller boost inductors. The controller's dual-phase transition-mode operation helps lower overall system costs, and is designed to simplify designs compared to traditional continuous conduction-mode controllers, according to the company.

The IC incorporates phase management and burst-mode features for good efficiency across all power levels, including standby mode. The chip is suitable for meeting ENERGY STAR and 80 Plus efficiency standards. In addition, its dual power stage architecture makes thermal management easier by distributing the heat over a larger area.

The TPS54331 SWIFT DC/DC converter reduces the power consumption of LCD TV point-of-load circuit board designs. The low-current chip, using the company's Eco-mode switching circuitry, boosts light-load efficiency by more than 25 percent compared to conventional DC/DC converters. Other features include wide operating range (3.5 to 28 volts), output voltage adjustable down to 0.8 volt, and output current to 3 amps.

Datasheets: Click here and here.

Pricing and availability : The UCC28061 and TPS54331, available today from TI and its authorized distributors in 16-pin and 8-pin SOIC packaging, are priced at $1.30, and $1.35, respectively, each in 1k quantities. Evaluation modules of the UCC28061 are available online through Reference designs, evaluation modules and the company's SwitcherPro software tool for the TPS54331 are also available online at

Texas Instruments , 1-800-477-8924,

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