Texas Instruments has débuted a power management chipset with intelligent digital control and a unique body-diode sensing feature to optimise secondary-side synchronous rectification in next-generation AC-DC and isolated DC-DC power supplies.
Together, the UCD3138A digital controller and UCD7138 low-side gate driver implement accurate control of dead time in the synchronous rectifiers to help minimise power losses and reduce the risk of MOSFET failure. They use body-diode voltage information in fast digital control algorithms to dynamically optimise dead-time and compensate for power-stage component variations without calibration or screening during mass production.
The UCD7138’s asymmetrical, rail-to-rail 4 A source and 6 A sink peak-current drive supports a load range of several hundred Watts to a kilowatt where multiple paralleled FETs are used. This solution’s 3 by 3 mm QFN package reduces board space as well as parasitic inductances when placed alongside the synchronous rectifier MOSFETs.
The hardware peripherals in the UCD3138A, along with 14 ns propagation delays and fast rise/fall times with minimised tolerances in the UCD7138, enable operation at frequencies up to 2 MHz.
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