‘SmartRectifier’ IC cuts part count

6 April 2006 Power Electronics / Power Management

International Rectifier's IR1167 SmartRectifier IC for AC-DC power converters for portable electronics equipment, is claimed to simplify and improve efficiency in secondary synchronous rectification (SR) in high power flyback and resonant half-bridge converter circuits. This enables smaller, cooler designs. The device uses IR's proprietary HVIC technology, making it compatible with all MOSFET gate types and offers direct connection to IR's range of 30 V to 200 V SR MOSFETs, which feature optimised on-resistance and gate charge characteristics. Since this IC works independently from the primary control, it can be used in a variety of transformer switching modes and applications with capacitive output filters. Independence from the primary side means that the IR1167 operates in low power 'burst modes' to enable '1W Standby' and California Energy Commission (CEC) 80Plus compliance. Since the SmartRectifier technique halves the losses dissipated in the SR MOSFET, this reduces the number of MOSFETs needed or allows a change from large TO-220 packages to small, surface mount SO-8 parts.

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