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TI slashes energy draw in DTV sets by 25%

Posted: 29 Aug 2008 ?? ?Print Version ?Bookmark and Share

Keywords:digital TV? power efficiency? PFC controller? DC/DC converter?

TI's UCC28061 and TPS54331 DTV chips

Two power management chips from Texas Instruments Inc., a dual-phase power factor correction (PFC) controller with Natural Interleaving technology and a new SWIFT DC/DC power management converter, are claimed to help increase energy efficiency and reduce system size and cost in DTVs.

Digital LCD TVs require 35 percent more power to operate than older CRT sets. Combining the LCD TVs higher power requirements with LCD TV market growth will multiply the demand for power. According to iSuppli, the CAGR of LCD TVs, said to be the fastest growing segment of DTVs, is 71.3 percent from 2002-2011 with 22.1 percent of that number comprising the years 2007-2011.

"TI strives to help our customers reduce energy consumption," said Ted Thomas, power supply manager. "TI is creating solutions that help our customers save power through the whole design, from plug to point-of-load."

Based on its previously announced UCC28060 PFC controller, TI's new UCC28061 controller helps facilitate the thinnest LCD TVs by incorporating smaller EMI filters, smaller or fewer output capacitors and smaller boost inductor volume to result in thinner power supply designs. The dual-phase transition-mode operation helps lower overall system costs, and is simpler to design than previously used continuous conduction mode controllers.

According to TI, the device has phase management and burst mode features, which provide efficiency at various power levels, including standby mode. This efficiency makes the UCC28061 suitable to meet Energy Star and 80 Plus efficiency standards. The dual power stage architecture makes thermal management easier by spreading the heat through more components, added TI.

The TPS54331 SWIFT DC/DC converter reduces the power consumption of LCD TV point-of-load circuit board designs. The device's light-load increases energy efficiency by more than 25 percent compared to conventional DC/DC converters due to a novel Eco-mode switching technique, 110?A operating current and low 1?A shutdown current. The TPS54331 has a wide input range of 3.5V to 28V, an output voltage adjustable down to 0.8V, and supplies up to 3A output current, which provides ample power for the digital and analog circuit blocks of an LCD TV.

The UCC28061 and TPS54331 are available today in 16-pin and 8-pin SOIC packaging, respectively. Suggested resale pricing in 1,000-unit quantities is $1.30 for the UCC28061 and $1.35 for the TPS54331. Evaluation modules of the UCC28061 are available. Reference designs, evaluation modules and the SwitcherPro software tool for the TPS54331 are also available.





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