The UCD3138A digital controller and UCD7138 low-side gate driver are said to improve system efficiency and cut synchronous rectification MOSFET voltage stress in half compared to other digital-power solutions.
The UCD7138's asymmetrical, rail-to-rail 4A source and 6A sink peak-current drive is suitable for high-power, high-efficiency isolated converter applications. The hardware peripherals in the UCD3138A, along with 14ns propagation delays and fast rise/fall times, enable frequencies up to 2MHz
Available in a 3 x 3mm QFN package, the chipset reduces board space as well as parasitic inductances when placed alongside a synchronous rectifier.
Accurate control of dead time in the synchronous rectifiers helps minimise 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 optimise dead-time and compensate for power-stage component variations.
