Texas Instruments (TI) introduced the first power management chipset with intelligent digital control and "unique" body diode sensing to optimize secondary-side synchronous rectification in next-generation AC / DC and isolated DC-DC power supplies.
Compared with other digital power solutions, the UCD3138A digital controller and UCD7138 low-side gate driver improve system efficiency and reduce the voltage stress of the synchronous rectification MOSFET by half.
The precise control of the dead time in the synchronous rectifier helps to minimize power consumption and reduce the risk of MOSFET failure. The UCD3138A and UCD7138 chipsets use body diode voltage information in a fast digital control algorithm to dynamically optimize dead time and compensate for changes in power stage components without the need for calibration or screening during mass production. This helps telecommunications and server terminal equipment manufacturers more easily bring energy-efficient 80 PLUS titanium-grade power supplies to the market, thereby saving energy costs for information technology service providers.
Key features: 1-Smart diode voltage sensing optimizes dead time: Adjusting timing to minimize diode conduction can improve efficiency and reliability, while eliminating the signal-to-noise ratio challenge of traditional MOSFET VDS ON sensing devices. 2-High peak current supports a wide load range: UCD7138's asymmetry, rail-to-rail 4A source and 6A peak current driver supports a load range of hundreds of watts to kilowatts, where multiple parallel FETs are used. 3-Compact solution enables fast and efficient switching: When placed in a 3mm x 3mm QFN package with a synchronous rectifier MOSFET, it can reduce board space and parasitic inductance. 4-UCD7138's fast rise / fall times and minimum tolerances enable extremely high frequencies.
In addition to the chipset, TI recently released a new solution for low-power AC / DC flyback converters. The UCC24630 synchronous rectifier controller provides the highest efficiency and has low sensitivity to circuit board layout and MOSFET package parasitics. Automatic low-power detection and 110uA standby current also allow designers to easily achieve ultra-low standby power consumption. Tools and support Use TI ’s Code Composer Studio (CCS) integrated development environment (IDE) to quickly develop and debug applications, or refer to the company ’s statement that TI has designed a 340W digitally controlled LLC resonant half-bridge DC-DC power conversion reference design .
