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AC-DC Power Converters for Laptops etc - IR1167 SmartRectifier™ IC

Supplier: International Rectifier

The SmartRectifier IC simplifies and improves efficiency in secondary synchronous rectification (SR) in high power flyback and resonant half-bridge converter circuits, enabling smaller, cooler designs.

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In 100W to 300W 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, IR’s new SmartRectifier IC employs a new technique for precise, direct sensing of voltage thresholds across the SR MOSFETs, allowing fast, accurate control to minimize power losses,” said Stephen Oliver, marketing manager at International Rectifier.

The IR1167 can increase overall system efficiency by 1 percent and reduce MOSFET temperature by 10 degrees, while slashing SR parts count by 75 percent,” Oliver added.

The IR1167 SmartRectifier IC uses IR’s proprietary HVIC technology, making it compatible with all MOSFET gate types and offers direct connection to IR’s wide range of 30V to 200V SR MOSFETs.

The benefits of the IR1167 SmartRectifier IC are further enhanced when used with IR’s MOSFETs featuring optimized on-resistance and gate charge characteristics, such as the IRF7853, IRFB4110 and IRFB4227.

These optimized MOSFETs work with the IR1167 as a “total chip set solution” to further maximize efficiency and power density in SR circuits.

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. 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.

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