参数资料
| 型号： | IR3087M |
| 厂商： | International Rectifier |
| 文件页数： | 16/35页 |
| 文件大小： | 0K |
| 描述： | IC XPHASE W/OVP/TM CTRL 20-MLPQ |
| 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 ~ 21 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： | *IR3087M |
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IR3087
Over Current Setting Resistor R OCSET
The inductor DC resistance is utilized to sense the inductor current. The copper wire of inductor has a constant
temperature coefficient of 3850 ppm/°C, and therefore the maximum inductor DCR can be calculated from Equation
(8), where R L_MAX and R L_ROOM are the inductor DCR at maximum temperature T L_MAX and room temperature
T_ ROOM respectively.
R L _ MAX = R L _ ROOM ? [ 1 + 3850 * 10 ? 6 ? ( T L _ MAX ? T ROOM )]
(8)
The current sense amplifier gain of IR3087 decreases with temperature at the rate of 1470 ppm/°C, which
compensates part of the inductor DCR increase. The phase IC die temperature is only a couple of degrees Celsius
higher than the PCB temperature due to the low thermal impedance of MLPQ package. The minimum current sense
amplifier gain at the maximum phase IC temperature T IC_MAX is calculated from Equation (9).
G CS _ MIN = G CS _ ROOM ? [ 1 ? 1470 * 10 ? 6 ? ( T IC _ MAX ? T ROOM )]
(9)
The total input offset voltage (V CS_TOFST ) of current sense amplifier in phase ICs is the sum of input offset
(V CS_OFST) of the amplifier itself and that created by the amplifier input bias currents flowing through the current
sense resistors R CS+ and R CS- .
V CS _ TOFST = V CS _ OFST + I CSIN + ? R CS + ? I CSIN ? ? R CS ?
(10)
The over current limit is set by the external resistor R OCSET as defined in Equation (11), where I LIMIT is the required
over current limit. I OCSET, the bias current of OCSET pin, changes with switching frequency setting resistor R OSC
and is determined by the curve in Figure 14. K P is the ratio of inductor peak current over average current in each
phase and is calculated from Equation (12).
R OCSET = [
I LIMIT
n
? R L _ MAX ? ( 1 + K P ) + V CS _ TOFST ] ? G CS _ MIN / I OCSET
(11)
K P =
( V I ? V O ) ? V O /( L ? V I ? f SW ? 2)
I O / n
(12)
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 (13) and (14) respectively.
R FB =
R L _ MAX ? V O _ NLOFST ? V CS _ TOFST ? n ? R O
I FB ? R L _ MAX
(13)
R DRP =
R FB ? R L _ MAX ? G CS _ MIN
n ? R O
(14)
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 .
Page 16 of 35
1 /31/05
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| IR3087MPBF | 功能描述:IC XPHASE W/OVP/TM CTRL 20MLPQ 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 |
| IR3087MTR | 功能描述:IC XPHASE W/OVP/TM CTRL 20L-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 |
| IR3087MTRPBF | 功能描述:IC CONTROLLER PHASE 20MLPQ 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 |
| IR3087PBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASETM PHASE IC WITH OPTI-PHASETM, OVP, AND OVERTEMP DETECT |
| IR3088 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE PHASE IC WITH FAULT AND OVERTEMP DETECT |
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