参数资料
型号: IR3081M
厂商: International Rectifier
文件页数: 6/39页
文件大小: 0K
描述: IC PHASE CONTROLLER 28-MLPQ
标准包装: 100
系列: XPhase™
应用: 处理器
电流 - 电源: 11mA
电源电压: 9.5 V ~ 14 V
工作温度: 0°C ~ 100°C
安装类型: 表面贴装
封装/外壳: 28-MLPQ
供应商设备封装: 28-MLPQ(5x5)
包装: 剪切带 (CT)
其它名称: *IR3081M

IR3081
SYSTEM THEORY OF OPERATION
XPhase TM Architecture
The XPhase TM architecture is designed for multiphase interleaved buck converters which are used in applications
requiring small size, design flexibility, low voltage, high current and fast transient response. The architecture can
control converters of any phase number where flexibility facilitates the design trade-off of multiphase converters.
The scalable architecture can be applied to other applications which require high current or multiple output voltages.
As shown in Figure 1, the XPhase TM architecture consists of a Control IC and a scalable array of phase converters
each using a single Phase IC. The Control IC communicates with the Phase ICs through a 5-wire analog bus, i.e.
bias voltage, phase timing, average current, error amplifier output, and VID voltage. The Control IC incorporates all
the system functions, i.e. VID, PWM ramp oscillator, error amplifier, bias voltage, and fault protections etc. The
Phase IC implements the functions required by the converter of each phase, i.e. the gate drivers, PWM comparator
and latch, over-voltage protection, and current sensing and sharing.
There is no unused or redundant silicon with the XPhase TM architecture compared to others such as a 4 phase
controller that can be configured for 2, 3, or 4 phase operation. PCB Layout is easier since the 5 wire bus
eliminates the need for point-to-point wiring between the Control IC and each Phase. The critical gate drive and
current sense connections are short and local to the Phase ICs. This improves the PCB layout by lowering the
parasitic inductance of the gate drive circuits and reducing the noise of the current sense signal.
POWER GOOD
PHASE FAULT
VR HOT
12V
ENABLE
VID5
VID0
VID1
IRU3081
CONTROL
IC
>> BIAS VOLTAGE
>> PHASE TIMING
PHASE FAULT
CIN
VOUT SENSE+
VID2
VID3
VID4
<< CURRENT SENSE
>> PWM CONTROL
>> VID VOLTAGE
CURRENT SHARE
PHASE HOT
IRU3086
PHASE
IC
0.1uF
COUT
VOUT+
VOUT-
PHASE FAULT
CCS
RCS
VOUT SENSE-
CURRENT SHARE
PHASE HOT
IRU3086
PHASE
IC
0.1uF
CCS
RCS
CONTROL BUS
ADDITIONAL PHASES
INPUT/OUTPUT
Figure 1. System Block Diagram
Page 6 of 39
10/01 /04
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