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| 型号： | IR3081AMPBF |
| 厂商： | International Rectifier |
| 文件页数： | 21/39页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR XPHASE VR10.0 28MLPQ |
| 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) |
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IR3081A
IR3086A 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
(15). To achieve feed-forward voltage mode control, the resistor R RAMP should be connected to the input of the
converter.
R PWMRMP =
V O
V IN * f SW * C PWMRMP * [ln( V IN ? V DAC ) ? ln( V IN ? V DAC ? V PWMRMP )]
(15)
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 +
(16)
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 +
(17)
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.
Over Temperature Setting Resistors R HOTSET1 and R HOTSET2
The threshold voltage of VRHOT comparator is proportional to the die temperature T J (oC) of phase IC. Determine
the relationship between the die temperature of phase IC and the temperature of the power converter according to
the power loss, PCB layout and airflow etc, and then calculate HOTSET threshold voltage corresponding to the
allowed maximum temperature from Equation (18).
V HOTSET = 4 . 73 * 10 ? 3 * T J + 1 . 241
(18)
There are two ways to set the over temperature threshold, central setting and local setting. In the central setting,
only one resistor divider is used, and the setting voltage is connected to HOTSET pins of all the phase ICs. To
reduce the influence of noise on the accuracy of over temperature setting, a 0.1uF capacitor should be placed next
to HOTSET pin of each phase IC. In the local setting, a resistor divider per phase is needed, and the setting voltage
is connected to HOTSET pin of each phase. The 0.1uF decoupling capacitor is not necessary. Use VBIAS as the
reference voltage. If R HOTSET1 is pre-selected, R HOTSET2 can be calculated as follows.
R HOTSET 2 = HOTSET 1
Page 21 of 39
R ? V HOTSET
V BIAS ? V HOTSET
(19)
1/31 /05
相关PDF资料 |
PDF描述 |
|---|---|
| IR3081AMTRPBF | IC CTRLR XPHASE VR10.0 28MLPQ |
| IR3081MPBF | IC PHASE CONTROLLER 28MLPQ |
| IR3081M | IC PHASE CONTROLLER 28-MLPQ |
| IR3082AMTRPBF | IC XPHASE CONTROL 9.6V 20-MLPQ |
| IR3082MTRPBF | IC CTLR XPHASE 20-MLPQ |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3081AMPBF | 制造商:International Rectifier 功能描述:Controller IC Package/Case:28-MLPQ |
| IR3081AMTR | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASETM VR 10 CONTROL IC |
| IR3081AMTRPBF | 功能描述:开关变换器、稳压器与控制器 XPHASE VR 10.0 CTRL IC 200 to 700mV 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 |
| 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 |
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