TI prepares for TV switch
02 September 2008
Two devices from Texas Instruments increase energy efficiency and reduce system size in digital TVs.
Anticipating the increased energy demands when TVs switch from analogue to digital, Texas Instruments announces the UCC28060 PFC (power factor correction) controller and the TPS54331 SWIFT DC/DC converter.
The PFC controller, the UCC28060, has smaller EMI filters, fewer and smaller output capacitors, and smaller boost inductor volume to create thinner power supply designs. The dual-phase transition mode operation lowers system cost as well as size and is claimed to be simpler to design than previous continuous conduction mode controllers.
It meets Energy Star and 80 Plus efficiency standards with phase management and burst level mode features, which provide efficiency at different power levels, including standby. The dual-power stage architecture is also claimed to make thermal management easier by spreading the heat through more components.
The TPS54331 SWIFT DC/DC converter reduces the power consumption of LCD TV point-of-load circuit board designs. This is significant as LCD TVs need 35 per cent more power than CRT ones. Energy efficiency is increased by over 25 per cent compared to conventional DC/DC converters, using an Eco-mode switching technique with 110µA operating current and a low shutdown current of 1µA. The input range is 3.5V to 28V and output current is adjustable down to 0.8V, supplying up to 3A output current, described as ample for the digital and analogue circuit blocks of an LCD TV.
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