Product category:
Power Supply ICs and Controllers
News Release from: Texas Instruments (April 2006-) | Subject: UCC28060
Edited by the Electronicstalk Editorial
Team on 22 May 2007
Two-phase control cuts power losses
PFC control circuit helps reduce power system cost and save energy in consumer applications, such as digital TVs, personal computers and entry-level server platforms.
The industry's first single-chip interleaved, transition-mode power factor correction (PFC) control circuit helps reduce power system cost and save energy in consumer applications, such as digital TVs, personal computers and entry-level server platforms TI will showcase the controller and other innovative power management technology at the Power Conversion and Intelligent Motion (PCIM) conference in Nuremberg, Germany, from 22nd to 24th May 2007
This article was originally published on Electronicstalk on 4 Apr 2006 at 8.00am (UK)
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TI's UCC28060 two-phase high-performance controller for 75 to 800W applications simplifies power system design, minimises switching losses, and saves system cost and valuable board space when compared with traditional single-phase, transition-mode topologies or continuous-conduction mode (CCM) topologies.
In certain customer applications, designers have been able to reduce their overall bill of materials cost by as much as 20%, while achieving higher levels of performance in a smaller, thinner and lighter power supply design.
The UCC28060 efficiently meets the world's most stringent power factor requirements for consumer electronic systems.
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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.
The UCC28060's ripple cancellation feature significantly reduces ripple current compared with single-phase or alternative "master-slave" interleaved solutions.
In addition, the feature allows a designer to reduce capacitor sise by 27%, and it gives designers the ability 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.
The UCC28060 can increase efficiency by up to 5% at light load conditions.
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.
The UCC28060 incorporates the industry's first "failsafe" overvoltage 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.
Secondly, the PFC device provides inrush 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 "brownout" conditions and recovery.
Samples of the UCC28060 are available in 16-pin SOIC packages.
It is sampling now, with volume production scheduled for June.
Suggested resale pricing in quantities of 1000 units is US $1.30.
An evaluation board, power factor correction application notes and data sheets are also available.
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