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AC-DC Synchronous Rectifier IC Driver, IR1168S The IR1168S is a dual smart secondary-side rectifier driver IC designed to drive two N-Channel power MOSFETs used as synchronous rectifiers in resonant converter applications. The IC can control one or more paralleled N MOSFETs to emulate the behavior of Schottky diode rectifiers. The drain-to-source voltage for each rectifier MOSFET is sensed differentially to determine the level of the current and the power switch is turned ON and OFF in close proximity of the zero current transition. Features • Secondary-side high speed controller for synchronous rectification in resonant halfbridge topologies • 200V proprietary IC technology • Max 500 kHz switching frequency • Anti-bounce logic and UVLO protection • 4A peak turn off drive current • Microcontroller start-up and ultra low quiescent current • 10.7V gate drive clamp • 70 ns turn-off propagation delay • Wide VCC operating range • Direct sensing for both synchronous rectifiers • Minimal component count • Simple design • Lead-free PRESS RELEASE DATA SHEETS HI-RES GRAPHIC AC-DC HOME PAGE Advantages • Ruggedness and noise immunity are accomplished using an advanced blanking scheme and double-pulse suppression that allows reliable operation in fixed and variable frequency applications. • Supply circuitry is not necessary because the supply comes from the output voltage or from the winding from the transformer. • The IR1168S is efficient even at light load because it is compatible with the burst mode. • The IR1168S senses the current across the MOSFET which ensures accurate turn on and turn off. • An IR1168S based solution shows an efficient improvement of a standard 240W LCD TV SMPS by 1.5%%, together with a reduction of rectifier devices by 25C.