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| 型号： | IR3084AMTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 29/45页 |
| 文件大小： | 0K |
| 描述： | IC CTLR XPHASE 28-MLPQ |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 1 |
| 系列： | XPhase™ |
| 应用： | 处理器 |
| 电流 - 电源： | 14mA |
| 电源电压： | 9.5 V ~ 16 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 |
| 其它名称： | IR3084AMTRPBFDKR |
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IR3084A
IR3086 EXTERNAL COMPONENTS
PWM Ramp Resistor R PWMRMP and Capacitor C PWMRMP
PWM ramp is generated by connecting the resistor R PWMRMP between a voltage source and PWMRMP pin as
well as the capacitor C PWMRMP between PWMRMP and LGND. Choose the desired PWM ramp magnitude
V RAMP and the capacitor C PWMRMP in the range of 100pF and 470pF, and then calculate the resistor R PWMRMP
from Equation (18). To achieve feed ? forward voltage mode control, the resistor R RAMP should be connected to
the input of the converter.
IN SW
PWMRMP
O
R
PWMRMP
?
V
*f
*C
*[ln(V
IN
? V
V
DAC
) ? ln(V
IN
? V
DAC
? V
PWMRMP
)]
(18)
Inductor Current Sensing Capacitor C CS+ and Resistors R CS+ and R CS ?
The DC resistance of the inductor is utilized to sense the inductor current. Usually the resistor R CS+ and capacitor
C CS+ in parallel with the inductor are chosen to match the time constant of the inductor, and therefore the voltage
across the capacitor C CS+ represents the inductor current. If the two time constants are not the same, the AC
component of the capacitor voltage is different from that of the real inductor current. The time constant mismatch
does not affect the average current sharing among the multiple phases, but affect the current signal ISHARE as
well as the output voltage during the load current transient if adaptive voltage positioning is adopted.
Measure the inductance L and the inductor DC resistance R L . Pre ? select the capacitor C CS+ and calculate R CS+
as follows.
R CS ? ?
L R L
C CS ?
(19)
The bias current flowing out of the non-inverting input of the current sense amplifier creates a voltage drop across
R CS+, which is equivalent to an input offset voltage of the current sense amplifier. The offset affects the accuracy
of converter current signal ISHARE as well as the accuracy of the converter output voltage if adaptive voltage
positioning is adopted. To reduce the offset voltage, a resistor R CS ? should be added between the amplifier
inverting input and the converter output . The resistor R CS ? is determined by the ratio of the bias current from the
non-inverting input and the bias current from the inverting input.
R CS ? ?
I CSIN ?
I CSIN ?
? R CS ?
(20)
If R CS ? is not used, R CS+ should be chosen so that the offset voltage is small enough. Usually R CS+ should be
less than 2 k ? and therefore a larger C CS+ value is needed.
Page 29 of 45
3/3/2009
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| IR3084MPBF | 功能描述:IC XPHASE CONTROL 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 |
| IR3084MTRPBF | 功能描述:开关变换器、稳压器与控制器 VR10 VR11 Athlon64 XPHASE CTRL IC RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| IR3084U | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASETM VR10, VR11 & OPTERON/ATHLON64 CONTROL IC |
| IR3084UMPBF | 功能描述:IC XPHASE CONTROL 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 |
| IR3084UMTRPBF | 功能描述:开关变换器、稳压器与控制器 VR10 VR11 Athlon64 XPHASE CTRL IC RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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