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TI unveils single-chip PFC control circuit

Posted: 01 Jun 2007     Print Version  Bookmark and Share

Keywords:PFC control circuit  single-chip PFC chip  Energy Star  PFC controller 

Texas Instruments Inc. has introduced what it claims as the industry's first single-chip, interleaved, transition-mode power factor correction (PFC) control circuit that helps lower power system cost and save energy in consumer applications, such as DTVs, PCs and entry-level server platforms.

The UCC28060 two-phase controller for 75-800W applications simplifies power system design, minimises switching losses and saves system cost and board space compared to traditional single-phase, transition-mode topologies or continuous-conduction mode (CCM) topologies. In certain customer applications, designers have been able to reduce their overall BOMs cost by as much as 20 per cent, while achieving higher levels of performance in a smaller, thinner and lighter power supply design, said TI.

Energy Star-compliant
UCC28060 meets the world's most stringent power factor requirements for consumer electronic systems, TI said. The device features Natural Interleaving technology, which reduces the amount of input and output current ripple, distributes magnetics to improve thermal management and provides light-load phase management. UCC28060's ripple cancellation feature reduces ripple current compared to single-phase or alternative "master-slave" interleaved solutions. The feature also allows designers to reduce capacitor size by 27 per cent, and it enables designers to use a smaller, less expensive EMI filter.

The PFC controller's light-load phase management enables a power supply to operate at high efficiency over the range of the load, enhancing system performance and aiding OEMs' efforts to achieve 80 Plus and Energy Star compliance. Phase management allows the user to turn on or off phases of the power supply so that only the phases required to power the load are enabled. UCC28060 can increase efficiency by up to five per cent at light load conditions, TI claimed.

System-level protection
Safety is a critical concern of all power system designers, and the UCC28060 offers several unique system control and protection features to improve power system reliability. UCC28060 incorporates the industry's first "failsafe" over-voltage protection circuit, which provides dual paths of voltage sensing to protect against shorts to an intermediate voltage. If undetected, such shorts could lead to a catastrophic failure on the board. Second, the PFC device provides in-rush current management to prevent MOSFET conduction during in-rush events, while eliminating reverse recovery events in the system output rectifiers. Finally, the UCC28060 employs sensorless current shaping to protect the system from potential damage that may otherwise occur during "brown-out" conditions and recovery.

Samples of the UCC28060 are available in a 16-pin SOIC package. It is currently sampling today. Volume pricing for 1,000 units is Rs.54.95 ($1.30). An evaluation board, power factor correction application notes and data sheets are also available.

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