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| 型号： | IR3081AMTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 8/39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
PWM Control Method
The PWM block diagram of the XPhase TM architecture is shown in Figure 2. Feed-forward voltage mode control with
trailing edge modulation is used. A high-gain wide-bandwidth voltage type error amplifier in the Control IC is used
for the voltage control loop. An external RC circuit connected to the input voltage and ground is used to program the
slope of the PWM ramp and to provide the feed-forward control at each phase. The PWM ramp slope will change
with the input voltage and automatically compensate for changes in the input voltage. The input voltage can change
due to variations in the silver box output voltage or due to the wire and PCB-trace voltage drop related to changes
in load current.
VIN
CONTROL IC
SYSTEM
PHASE IC
50%
DUTY
CYCLE
RAMP GENERATOR
VPEAK
VVALLEY
RMPOUT
RPHS1
BIASIN
RAMPIN+
RAMPIN-
REFERENCE
VOLTAGE
CLOCK
PULSE
GENERATOR
PWM
COMPARATOR
PWM
LATCH
S
RESET
DOMINANT
GATEH
VOSNS+
VOUT
+
-
VBIAS
REGULATOR
VDAC
VBIAS
VDAC
VOSNS-
EAOUT
RPHS2
RPWMRMP
CPWMRMP
EAIN
PWMRMP
SCOMP
CSCOMP
SHARE
ADJUST
-
+
ENABLE
RAMP
DISCHARGE
CLAMP
R
BODY
BRAKING
COMPARATOR
GATEL
COUT
GND
VOSNS-
ERROR
ERROR
AMPLIFIER
X
0.91
IFB
AMP
IROSC
FB
RVFB
RDRP
ISHARE
10K
+
-
20mV
CURRENT
SENSE
AMPLIFIER
X34
CSIN+
CSIN-
CCS
RCS
VDRP
AMP
VDRP
IIN
DACIN
SYSTEM
PHASE IC
BIASIN
REFERENCE
VOLTAGE
PWM
RPHS1
RAMPIN+
RAMPIN-
EAIN
CLOCK
PULSE
GENERATOR
PWM
COMPARATOR
-
+
LATCH
S
RESET
DOMINANT
R
GATEH
GATEL
RPHS2
ENABLE
RPWMRMP
PWMRMP
BODY
CPWMRMP
SCOMP
CSCOMP
SHARE
ADJUST
RAMP
DISCHARGE
CLAMP
BRAKING
COMPARATOR
ERROR
AMPLIFIER
X
0.91
ISHARE
10K
+
20mV
CURRENT
SENSE
AMPLIFIER
CSIN+
-
X34
CSIN-
CCS
RCS
DACIN
Figure 2. PWM Block Diagram
Frequency and Phase Timing Control
The oscillator is located in the Control IC and its frequency is programmable from 150kHz to 1MHZ by an external
resistor. The output of the oscillator is a 50% duty cycle triangle waveform with peak and valley voltages of
approximately 5V and 1V respectively. This signal is used to program both the switching frequency and phase
timing of the Phase ICs. The Phase IC is programmed by resistor divider R PHS1 and R PHS2 connected between the
VBIAS reference voltage and the Phase IC LGND pin. A comparator in the Phase ICs detects the crossing of the
oscillator waveform over the voltage generated by the resistor divider and triggers a clock pulse that starts the PWM
cycle. The peak and valley voltages track the VBIAS voltage reducing potential Phase IC timing errors. Figure 3
shows the Phase timing for an 8 phase converter. Note that both slopes of the triangle waveform can be used for
phase timing by swapping the RMPIN+ and RMPIN– pins, as shown in figure 2.
Page 8 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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