Smart rectifier IC cuts parts count

19 April 2006 Power Electronics / Power Management

The new IR1167 SmartRectifier IC for AC-DC power converters for portable computing and entertainment systems, simplifies and improves efficiency in secondary synchronous rectification (SR) in high power flyback and resonant half-bridge converter circuits, enabling smaller, cooler designs, claims the manufacturer, International Rectifier. In 100 W to 300 W flyback circuits, traditional complex and bulky current transformer control circuits waste energy because large reversing currents are required to sense polarity shifts through the SR Mosfets. In contrast, says IR, SmartRectifier ICs employ a new technique for precise, direct sensing of voltage thresholds across the SR Mosfets, allowing fast, accurate control to minimise power losses. It is compatible with all MOSFET gate types. Since the new IC works independently from the primary control, it can be used in a variety of transformer switching modes and applications with capacitive output filters. The IC is available in either SO-8 or DIP-8 packages.

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