Power Electronics

SmartRectifier IC Increases System Efficiency 1.5 Percent

International Rectifier’s family of SmartRectifier™ ICs includes introduction of the IR1168 for AC-DC power converters for high-end LCD TVs. The 200V dual smart secondary-side rectifier driver IC is designed to drive two N-Channel power MOSFETs used as synchronous rectifiers (SR) in resonant half-bridge topologies. In contrast to traditional current transformer SR methods, the IR1168 accurately determines turn-on and turn-off based on MOSFET drain sensing voltage in close proximity to zero current transition, eliminating the need for additional components to simplify design.

Co-designed with IR's DirectFET® MOSFETs, which feature IR's latest Trench silicon and packaging technology, the IR1168-based solution delivers an efficiency improvement of 1.5% for a standard 240W LCD TV SMPS and a reduction of rectifier device temperature of 25°C while shrinking board size by two thirds.

The IR1168, featuring IR's proprietary high-voltage IC technology, supports burst mode operation to deliver efficiency benefits even at light loads. 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. Other key features include maximum 500kHz switching frequency, anti-bounce logic and UVLO protection, 4A peak turn-off gate drive current, micropower start-up and ultra low quiescent current, 10.7V gate drive clamp, 70ns turn-off propagation delay and a wide Vcc operating range from 8.6V to 18V.

Available in an 8-pin SOIC package, pricing for the IR1168SPbF begins at US $1.50 each in quantities of 10,000-units. Production quantities are available immediately. The devices are lead free and RoHS compliant. Prices are subject to change.

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