参数资料
| 型号： | IR3086MPBF |
| 厂商： | International Rectifier |
| 文件页数： | 16/34页 |
| 文件大小： | 0K |
| 描述： | IC CONTROLLER PHASE 20MLPQ |
| 标准包装： | 5 |
| 系列： | XPhase™ |
| 应用： | 处理器 |
| 电流 - 电源： | 10mA |
| 电源电压： | 8.4 V ~ 14 V |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-MLPQ |
| 供应商设备封装： | 20-MLPQ（4x4） |
| 包装： | 剪切带 (CT) |
| 其它名称： | *IR3086MPBF |
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IR3086
R FB =
R L _ MAX ? V O _ NLOFST ? V CS _ TOFST ? n ? R O
I FB ? R L _ MAX
(15)
R DRP =
R FB ? R L _ MAX ? G CS _ MIN
n ? R O
(16)
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 RAMP and
the capacitor C PWMRMP in the range of 100pF and 470pF, and then calculate the resistor R PWMRMP from Equation
(17). To achieve feed-forward voltage mode control, the resistor R RAMP should be connected to the input of the
converter.
R PWMRMP =
V IN * f SW * C PWMRMP * [ln( V IN
V O
? V DAC ) ? ln( V IN ? V DAC ? V PWMRMP )]
(17)
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 +
(18)
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 +
(19)
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 16 of 34
9/30 /04
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