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| 型号： | IR3502MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 29/39页 |
| 文件大小： | 0K |
| 描述： | IC XPHASE3 CONTROLLER 32-MLPQ |
| 标准包装： | 1 |
| 系列： | XPhase3™ |
| 应用： | 处理器 |
| 电流 - 电源： | 8mA |
| 电源电压： | 8 V ~ 16 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： | 标准包装 |
| 产品目录页面： | 1383 (CN2011-ZH PDF) |
| 其它名称： | IR3502MTRPBFDKR |
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IR3502
Thermistor R THERM and Over Temperature Setting Resistors R HOTSET1 and R HOTSET2
The threshold voltage of VRHOT comparator is fixed at 1.6V, and a negative temperature coefficient (NTC)
thermistor R THERM is required to sense the temperature of the power stage. If we pre-select R THERM , the NTC
thermistor resistance at allowed maximum temperature T MAX is calculated from (27).
R TMAX = R THERM * EXP [ B THERM * (
1
T L _ MAX
?
1
T _ ROOM
)]
(27)
Select the series resistor R HOTSET2 to linearize the NTC thermistor, which has non-linear characteristics in the
operational temperature range. Then calculate R HOTSET1 corresponding to the allowed maximum temperature
TMAX from (28).
R HOTSET 1 =
( R TMAX + R HOTSET 2 ) * ( VCCL ? 1 . 6)
1 . 6
(28)
VCCL Capacitor C VCCL
The capacitor is selected based on the stability requirement of the linear regulator and the load current to be
driven. The linear regulator supplies the bias and gate drive current of the phase ICs. A 4.7uF normally ensures
stable VCCL performance for Intel VR11 applications.
VCCL Regulator Drive Resistor R VCCLDRV
The drive resistor is primarily dependent on the load current requirement of the linear regulator and the
minimum input voltage requirements. The following equation gives an estimate of the average load current of
the switching phase ICs.
I drive _ avg = [ ( Q gb + Q gt ) ? f sw + 10 mA ] ? n
(29)
Q gb and Q gt are the gate charge of the top and bottom FET. For a minimum input voltage and a maximum
VCCL, the maximum R VCCLDRV required to use the full pull-down current of the VCCL driver is given by
R VCCLDRV =
V I (min) ? 0 .7 ? 6. 8 V
I drive _ avg / β min
(30)
Due to limited pull down capability of the VCCLDRV pin, make sure the following condition is satisfied.
V I (max) ? 0 .7 ? 6 . 8 V
R VCCLDRV
< 10 mA
(31)
In the above equation, V I ( min) and V I ( max) is the minimum and maximum anticipated input voltage. If the
above condition is not satisfied there is a need to use a device with higher β min or Darlington configuration can
be used instead of a single NPN transistor.
Current Monitor Filter
A filter is added to isolate the CPU from rapid changes in the load current and trigger false response. A filter with
300 us time constant provides adequate delay for Intel VR11.1 response. A 1k resistor between IMON and local
ground helps equalize the source and sink current of the IMON pin.
Page 29 of 39
July 28, 2009
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3503MTRPBF | 功能描述:开关变换器、稳压器与控制器 X-PHASE IR3503 AMD SVID 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 |
| IR3504MPBF | 制造商:International Rectifier 功能描述:Control IC 32-Pin MLPQ Strip |
| IR3504MTRPBF | 功能描述:开关变换器、稳压器与控制器 X-PHASE IR3504 AMD SVID 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 |
| IR3505 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM PHASE IC |
| IR3505MPBF | 功能描述:IC XPHASE3 CONTROL 16-MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:XPhase3™ 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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