Texas Instruments (TI) today introduced the first power management chipset with intelligent digital control and a unique body-diode sensing feature to optimize secondary-side synchronous rectification in next-generation ac-dc and isolated dc-dc power supplies. The UCD3138A digital controller and UCD7138 low-side gate driver improve system efficiency and cut synchronous rectification MOSFET voltage stress in half compared to other digital-power solutions.
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Accurate control of dead time in the synchronous rectifiers helps minimize power losses and reduces the risk of MOSFET failure. The UCD3138A and UCD7138 chipset use body-diode voltage information in fast digital control algorithms to dynamically optimize dead-time and compensate for power-stage component variations without calibration or screening during mass production. This helps telecom and server end-equipment manufacturers more easily bring to market energy-efficient 80 PLUS Titanium-grade power supplies, which saves energy costs to information technology service providers.
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This compact solution enables fast, efficient switching: A 3-mm by 3-mm QFN package reduces board space as well as parasitic inductances when placed alongside the synchronous rectifier MOSFETs. Efficient operation at frequencies up to 2 MHz: The hardware peripherals in the UCD3138A along with 14-ns propagation delays and fast rise/fall times with minimized tolerances in UCD7138 enable extremely high frequencies.
The UCD3138A and UCD7138 devices are available now in the TI store and through the company’s authorized distribution network. The UCD7138 MOSFET driver is packaged in a 6-pin QFN package and is priced at US$1.10 in 1,000-unit quantities. The UCD3138A digital controller is packaged in a 40-pin QFN package and is priced at US$3.22 in 1,000-unit quantities.
source: http://www.powerpulse.net/story.php?storyID=32277
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