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参数资料
| 型号： | IR3080MTR |
| 厂商： | International Rectifier |
| 文件页数： | 22/41页 |
| 文件大小： | 0K |
| 描述： | IC PHASE CONTROLLER 32L MLPQ |
| 标准包装： | 3,000 |
| 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： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-MLPQ（5x5） |
| 包装： | 带卷 (TR) |
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IR3080
No Load Output Voltage Setting Resistor R FB and Adaptive Voltage Positioning Resistor R DRP
A resistor between FB pin and the converter output is used to create output voltage offset V O_NLOFST, which is the
difference between V DAC voltage and output voltage at no load condition. Adaptive voltage positioning further
lowers the converter voltage by R O *I O, where R O is the required output impedance of the converter.
R FB is not only determined by I FB , the current flowing out of FB pin as shown in Figure 14, but also affected by the
adaptive voltage positioning resistor R DRP and total input offset voltage of current sense amplifiers. R FB and R DRP
are determined by (16) and (17) respectively,
R FB =
R L _ MAX ? V O _ NLOFST ? V CS _ TOFST ? n ? R O
I FB ? R L _ MAX
(16)
R DRP =
R FB ? R L _ MAX ? G CS _ MIN
n ? R O
(17)
Control IC Over Temperature Setting Resistors R HOTSETC1 and R HOTSETC2
The threshold voltage of VRHOT comparator is proportional to the die temperature T J (oC) of control IC IR3080, as
shown in Equation (18). Determine the relationship between the die temperature of IR3080 and the temperature of
the power converter according to the power loss, PCB layout and airflow, etc. Then calculate the VRHOT threshold
voltage corresponding to the temperature.
V VRHOT = 4 . 73 * 10 ? 3 * T J + 1 . 241
(18)
Use VBIAS as the reference voltage. If R HOTSETC1 is pre selected, R HOTSETC2 can be calculated according to
Equation (19).
R HOTSETC 2 = R HOTSETC 1
V VRHOT
V VBIAS + V VRHOT
(19)
Body Braking TM Related Resistors R BBFB and R BBDRP
The body braking TM during Dynamic VID can be disabled by connecting BBFB pin to ground. If the feature is
enabled, Resistors R BBFB and R BBDRP are needed to restore the feedback voltage of the error amplifier after
Dynamic VID step down. Usually R BBFB and R BBDRP are chosen to match R FB and R DRP respectively .
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 PWMRMP
and the capacitor C PWMRMP in the range of 100pF and 470pF, and then calculate the resistor R PWMRMP from
Equation (20). 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 )]
(20)
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.
Page 22 of 41
9 /30/04
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3080MTRPBF | 功能描述:开关变换器、稳压器与控制器 XPHASE VRD10 CTRL IC 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 |
| IR3080PBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASETM VRD10 CONTROL IC WITH VCCVID & OVERTEMP DETECT |
| IR3081 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE VR 10.0 CONTROL IC |
| IR3081A | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASETM VR 10 CONTROL IC |
| IR3081AM | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASETM VR 10 CONTROL IC |
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