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Current Sensing Technique for Multiphase Converters

One of the difficulties of implementing the multiphase buck converter that powers the microprocessor is the issue of current sharing among parallel modules. One of the common techniques for insuring current sharing is to implement some form of current-sensing technique, usually by sensing the inductor current or switch current. However, the conventional implementation of current sensing does not lend itself to easy implementation in a control IC. CPES has developed a patented technology, "A Novel Fast-Transient Response and Minimal-Sized Regulator Modules with Novel Current Sensing and Current Sharing Technology" (U.S. Patent 6,414,469). This proposed approach employs a simple R-C network to emulate the current going through the energy storage inductor, and is very easy to implement in a control IC. This technology has been widely adopted as standard practice and commercialized by such companies as Intersil, ADI, ON Semiconductor, Semtech, Texas Instruments, International Rectifier, Maxim, National Semiconductor, Primarion, etc.
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