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International Rectifier has introduced the IR1167 SmartRectifier IC, which contains proprietary voltage sensing control.
INTERNATIONAL RECTIFIER, El Segundo, CA. (310) 252-7726.
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Designed for use in ac/dc power converters for laptops, mini-PCs, LCD and PDP televisions, game systems and other digital computing and home entertainment systems, the IR1167 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. The 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.
The IR1167 employs 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.
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.
WHY IS THIS IMPORTANT?
The SmartRectifer IC is expected to slash parts count in ac/dc power converters by 75% and reduce MOSFET temperature by 10° with 1% increase in system efficiency.
WHAT ABOUT DESIGN TOOLS?
In addition to data sheets, application notes and technical papers, new SmartRectifier online design software is now available on IR's myPower site (http://www.irf.com/ design-center/mypower/). Designers enter application conditions and performance requirements to obtain recommended IC and MOSFET chip sets, which can be sorted by performance and system cost. Daughter cards are available that offer a fast and simple way to compare efficiency and simplicity of IR's SmartRectifier solution versus diode designs and complex SR solutions.
PRICING AND AVAILABILITY
Pricing is $1.08 each/10,000 for the IR1167A/BSPbF and $1.11 for the IR1167A/BPbF. The IC is available in either SO-8 or DIP-8 packages, which are lead-free (PbF) and compliant with the Restriction of Hazardous Substances Directive (RoHS). Samples are available now through product marketing. For more information, contact Wayne Yoshida, at the number listed above or by e-mail at wyoshid1@irf.com.
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