International Rectifier has expanded its family of SmartRectifier ICs with the introduction of the IR1168 for AC-DC power converters for high-end applications.
The 200 V 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 and simplifying design.
While synchronous rectification provides significant energy savings compared to diode-based designs, traditional SR methods are complex and require a high component count. Using only two gate resistors and a supply capacitor, the IR1168 delivers a low system temperature and high-power density for high-efficiency and reliability.
The IR1168 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 500 kHz switching frequency, anti-bounce logic and UVLO protection, 4 A peak turn-off gate drive current, low-power startup and low quiescent current, 10,7 V gate drive clamp, 70 ns turn-off propagation delay and a wide VCC operating range from 8,6 V to 18 V.
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