International Rectifier Introduces XPhase Scalable Multi-Phase Architecture for Interleaved Buck DC-DC Converters.Technology Editors EL SEGUNDO, Calif.--(BUSINESS WIRE)--Jan. 21, 2003 International Rectifier, IR(R) (NYSE NYSE See: New York Stock Exchange : IRF IRF Interferon Regulatory Factor IRF International Religious Freedom IRF Institut for Rationel Farmakoterapi (German) IRF Inherited Rights Filter (Novell) IRF Inherited Rights Filter ), introduces XPhase(TM), an extremely flexible and scalable architecture for multiphase, interleaved buck DC-DC DC-DC Direct Current to Direct Current (power conversion) converters requiring one or more phases. The first XPhase chip set consists of the IR3081 Control IC and the IR3086 Phase IC, and provides a high performance solution that exceeds the VRM (Voltage Regulator Module) See voltage regulator. or VRD/EVRD 10.0 requirements for the most advanced microprocessors used in servers and high-end desktop computers. Unlike other multiphase solutions, which are limited in the number of phases they drive, the IR XPhase architecture enables a scalable multiphase design that accommodates the constant change and unpredictable nature of advanced CPU CPU in full central processing unit Principal component of a digital computer, composed of a control unit, an instruction-decoding unit, and an arithmetic-logic unit. power requirements. The XPhase architecture consists of a Control IC, which communicates with the Phase IC using a simple 5-wire bus scheme. Phases can be added or removed without changing the fundamental design. The 5-wire analog bus consists of bias voltage, phase timing, average current, error amplifier output and VID VID Video VID Vide (Latin: See) VID Vendor Id (USB PnP ID) VID Visual InterDev (Microsoft development environment) VID VLAN Identifier (IEEE 802. voltage. By eliminating point-to-point wiring between the Control and the Phase ICs, the 5-wire bus shortens interconnections, cutting parasitic inductance and noise and thus improves PCB PCB: see polychlorinated biphenyl. PCB in full polychlorinated biphenyl Any of a class of highly stable organic compounds prepared by the reaction of chlorine with biphenyl, a two-ring compound. layout. The IR3081 Control IC in the 28-lead MLPQ package contains all one-per-converter circuitry, including voltage identification (VID) pull-up resistors, PWM (Pulse Width Modulation) A modulation technique that generates variable-width pulses to represent the amplitude of an analog input signal. Like its fixed-width pulse density modulation (PDM) cousin, the output switching transistor is on more of the time for a ramp oscillator oscillator Mechanical or electronic device that produces a back-and-forth periodic motion. A pendulum is a simple mechanical oscillator that swings with a constant amplitude, requiring the addition of energy at each swing only to compensate for the energy lost because of air , error amplifier, bias voltage, fault detection and other necessary functions. The IR3086 Phase IC in the 20-lead MLPQ package drives and monitors a single phase in a multiphase converter. The IR3086 Phase IC includes all one-per-phase circuitry that includes gate drivers, PWM comparator and latch, over-voltage protection, and current sensing and sharing and programmable over-temperature detection. A patent-pending body braking control feature achieves nearly two times improvement in inductor slew rate, improving transient response time and efficiency. This control technique turns off the synchronous rectifier MOSFET (Metal Oxide Semiconductor Field Effect Transistor) The most popular and widely used type of field effect transistor (see FET). MOSFETs are either NMOS (n-channel) or PMOS (p-channel) transistors, which are fabricated as individually packaged in response to a significant decrease in load current. Besides permitting the use of larger inductor values, body braking also helps to decrease output capacitor requirements, reducing solution cost and size. The XPhase Control IC implements feed-forward voltage mode control with modified Type 3 load line terminal compensation and trailing edge modulation in conjunction with adaptive voltage positioning. Because accurate current sharing is critical to multiphase designs, XPhase architecture implements average output inductor current sensing to accomplish very accurate current sharing with support for 100% duty cycle and over-lapping phases. In addition, it supports single cycle transient response. A 100A, six-phase, VRM 10.0-compliant converter using the IR3081 and IR3086 XPhase chipset and IR's DirectFET(TM) MOSFETs (IRF6602 control FET FET: see transistor. (Field Effect Transistor) One of two major categories of transistor; the other is bipolar. FETs use a gate element that, when charged, creates an electromagnetic field that changes the conductivity of a silicon and IRF6601 synchronous FET) yields 84% efficiency with less than 4% variation in phase current and average current per phase. "The XPhase architecture is a culmination of the feature set, flexibility and performance that our customers have requested. It provides a solution that meets not only today's CPU requirements, but can also be scaled to meet the needs of tomorrow," said John Burgess, Vice President, Computing Business Development. Data sheets are posted on the International Rectifier Web site: IR3081 Control IC: http://www.irf.com/product-info/datasheets/data/ir3081.pdf IR3086 Phase IC: http://www.irf.com/product-info/datasheets/data/ir3086.pdf Pricing The IR3081 Control IC is US $1.65 each; the IR3086 Phase IC is US $1.25 each in 10,000-unit quantities. About International Rectifier International Rectifier is recognized as a leading supplier of power semiconductors and systems solutions. IR's patented HEXFET HEXFET Hexagonal Field Effect Transistor (R) power MOSFETs, IGBTs and high-voltage ICs make electricity work smarter in industrial automation and controls, automotive electrical systems, consumer electronics, computers and peripherals, telecommunications, lighting and satellite/launch vehicle applications. Visit the International Rectifier Web site at www.irf.com. Trademark Notice IR(R) and HEXFET(R) are registered trademarks of International Rectifier Corporation. All other product names noted herein may be trademarks of their respective holders. |
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