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| 型号： | IR3081AMTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 11/39页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR XPHASE VR10.0 28MLPQ |
| 标准包装： | 1 |
| 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： | 标准包装 |
| 产品目录页面： | 1381 (CN2011-ZH PDF) |
| 其它名称： | IR3081AMPBFDKR |
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IR3081APBF
v L
i L
Current
Sense Amp
L
R CS
R L
C CS
v C c S
V O
C O
CSOUT
Figure 5. Inductor Current Sensing and Current Sense Amplifier
The advantage of sensing the inductor current versus high side or low side sensing is that actual output current
being delivered to the load is obtained rather than peak or sampled information about the switch currents. The
output voltage can be positioned to meet a load line based on real time information. Except for a sense resistor in
series with the inductor, this is the only sense method that can support a single cycle transient response. Other
methods provide no information during either load increase (low side sensing) or load decrease (high side sensing).
An additional problem associated with peak or valley current mode control for voltage positioning is that they suffer
from peak-to-average errors. These errors will show in many ways but one example is the effect of frequency
variation. If the frequency of a particular unit is 10% low, the peak to peak inductor current will be 10% larger and
the output impedance of the converter will drop by about 10%. Variations in inductance, current sense amplifier
bandwidth, PWM prop delay, any added slope compensation, input voltage, and output voltage are all additional
sources of peak-to-average errors.
Current Sense Amplifier
A high speed differential current sense amplifier is located in the Phase IC, as shown in Figure 5. Its gain decreases
with increasing temperature and is nominally 34 at 25oC and 29 at 125oC (-1470 ppm/oC). This reduction of gain
tends to compensate the 3850 ppm/oC increase in inductor DCR. Since in most designs the Phase IC junction is
hotter than the inductor these two effects tend to cancel such that no additional temperature compensation of the
load line is required.
The current sense amplifier can accept positive differential input up to 100mV and negative up to -20mV before
clipping. The output of the current sense amplifier is summed with the DAC voltage and sent to the Control IC and
other Phases through an on-chip 10K ? resistor connected to the ISHARE pin. The ISHARE pins of all the phases
are tied together and the voltage on the share bus represents the average current through all the inductors and is
used by the Control IC for voltage positioning and current limit protection.
Average Current Share Loop
Current sharing between phases of the converter is achieved by the average current share loop in each Phase IC.
The output of the current sense amplifier is compared with the share bus less a 20mV offset. If current in a phase is
smaller than the average current, the share adjust amplifier of the phase will activate a current source that reduces
the slope of its PWM ramp thereby increasing its duty cycle and output current. The crossover frequency of the
current share loop can be programmed with a capacitor at the SCOMP pin so that the share loop does not interact
with the output voltage loop.
Page 11 of 39
1/31 /05
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| IR3081M | 功能描述:IC PHASE CONTROLLER 28-MLPQ RoHS:否 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:XPhase™ 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| IR3081MPBF | 功能描述:IC PHASE CONTROLLER 28MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:XPhase™ 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| IR3081MTR | 功能描述:IC PHASE CONTROLLER 28L MLPQ RoHS:否 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:XPhase™ 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| IR3081MTRPBF | 功能描述:IC PHASE CONTROLLER 28-MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:XPhase™ 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| IR3082 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE AMD OPTERON/ATHLON 64 CONTROL IC |
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