Mid-power rectifier IC is 'smart'

15 November 2006 Power Electronics / Power Management

Enabling smaller and cooler power supplies, International Rectifier's eight-pin IR1166 IC simplifies the design of mid-power secondary synchronous rectification (SR) circuits of resonant half-bridge converters and flyback converters designed for 50-150 W discontinuous conduction mode (DCM), critical conduction mode (CrCM), and continuous conduction mode (CCM). IR says that its new SmartRectifier IC uses a new technique for precise, direct sensing of voltage thresholds across the SR MOSFETs. This allows fast, accurate control to minimise power losses in mid-power flyback circuits. In contrast, traditional complex and bulky current transformer control circuits waste energy because of the large reversing currents required to sense polarity shifts through the SR MOSFETs. The IR1166 SmartRectifier IC works independently from the primary control and enables synchronous rectification so it can be used in a variety of transformer switching modes and applications with capacitive output filters. This new device is compatible with all MOSFET gate types. It comes in an SO-8 package and soon in DIP-8 package.

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