Product category:
Power Supply ICs and Controllers
News Release from: International Rectifier | Subject: IR3084 and IR3084U
Edited by the Electronicstalk Editorial
Team on 11 April 2006
Power controllers boost multiphase
efficiency
New control ICs can achieve as much as 3% higher efficiency in 130A applications with seven phases compared with competing five-phase designs.
International Rectifier has expanded the IR XPhase family of scalable multiphase convertor chipset devices with the IR3084 and IR3084U XPhase control ICs The new control ICs are designed to be used with IR's existing IR3086A phase IC and companion DirectFET power MOSFETs such as the IRF6617 and IRF6691 to achieve as much as 3% higher efficiency in 130A applications with seven phases compared with competing five-phase designs
This article was originally published on Electronicstalk on 15 Feb 2001 at 8.00am (UK)
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The IR3084 supports Intel VR10.x and VR11 microprocessor core power requirements, while the IR3084U is a universal voltage identification (VID) device for VR10.x and VR11 as well as AMD Opteron VID codes and start-up sequences.
The XPhase chipset is designed to increase power density and efficiency in desktops, servers, voltage regulator modules (VRM) and embedded systems.
By increasing the number of phases from five to seven, the current in each phase is decreased, and enables the use of smaller inductors and reduced output capacitors.
This enables a reduction in footprint size from 3200 to 2400mm2, a 25% reduction in board area.
The seven-phase IR3084 solution including the IRF6617 and IRF6691 power MOSFETs achieves 88% efficiency at full load current and eliminates the need for a heatsink.
Both control ICs include 0.5% overall system accuracy and differential remote voltage sensing.
The ICs offer a programmable 150kHz to 1MHz oscillator, remote temperature sensing, and lossless DCR current sensing with programmable hiccup overcurrent protection.
The IR3084U includes a VID select pin which allows for simple migration from AMD to Intel VID codes.
XPhase is IR's distributed multiphase architecture that consists of control ICs and phase ICs that communicate using a simple five-wire bus scheme.
Phases can be added or removed without changing the fundamental design.
The five-wire analogue bus consists of bias voltage, phase timing, average current, error amplifier output and VID voltage.
By eliminating point-to-point wiring between the control and the phase ICs, the five-wire bus shortens interconnections, and reduces parasitic inductance and noise.
This simplifies PCB layout and gives a more robust design.
The IR3084 and IR3084U XPhase control ICs are lead-free (PbF) and RoHS (Restriction of Hazardous Substances) compliant and available immediately.
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