Scalable multiphase architecture for interleaved buck DC-DC converters

12 March 2003 Power Electronics / Power Management

International Rectifier has launched XPhase, which it calls an extremely flexible and scalable architecture for multiphase, interleaved buck DC-DC 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 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, this architecture enables a scalable multiphase design that accommodates the constant change and unpredictable nature of advanced CPU 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 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 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 ramp oscillator, 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 VRHOT over temperature detection.

For more information contact Avnet Kopp, 011 809 6100, [email protected], www.avnet.co.za

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