参数资料
| 型号： | IR3500MPBF |
| 厂商： | International Rectifier |
| 文件页数： | 37/47页 |
| 文件大小： | 0K |
| 描述： | IC XPHASE3 CONTROL 32-MLPQ |
| 标准包装： | 100 |
| 系列： | XPhase3™ |
| 应用： | 处理器 |
| 电流 - 电源： | 6.5mA |
| 电源电压： | 4.75 V ~ 7.5 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： | 剪切带 (CT) |
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IR3500
No Load Output Voltage Setting Resistor R VSETPT and Adaptive Voltage Positioning Resistor R DRP
From Figure 24, the bias current of VSETPT pin is 11.9uA with R OSC =50k .
R VSETPT =
V CS _ TOFST
I VSETPT
=
10 * 10 ? 3
11 . 9 * 10 ? 6
= 840 ? , choose R VSETPT =825 .
VCCL Programming Resistor R VCCLFB1 and R VCCLFB2
Choose VCCL=7V to maximize the converter efficiency. Pre-select R VCCLFB1 =20k , and calculate R VCCLFB2.
R VCCLFB 2 =
R VCCLFB 1 * 1.19
VCCL ? 1 . 19
=
20 * 10 3 * 1.19
7 ? 1 . 19
= 4 . 05 k ?
VCCL Drive Resistor R VCCLDRV
The maximum drive current for the linear regulator is dependent on the type of MosFET used. For this
example its assumed that IR6622/ IRF6691 are used as buck switches.
I drive _ avg = [ ( 47 n + 11 n ) ? 250 k + 10 mA ] ? 3 = 75 mA
(19)
The minimum input voltage is assumed to be 10 V and VCCL is fixed at 6.5V for this design.
R VCCLDRV =
10 V ? 0. 7 V ? 6. 5 V
75 mA / 50
= 1 . 8 k ?
(20)
Assuming the maximum input voltage to as 14 V,
14 V ? 0 . 7 ? 6 . 5
1 . 8 k ?
= 3 mA < 10 mA
(21)
Thermistor R THERM and Over Temperature Setting Resistors R HOTSET1 and R HOTSET2
Choose NTC thermistor R THERM =2.2k , which has a constant of B THERM =3520, and the NTC thermistor
resistance at the allowed maximum temperature T MAX is,
R TMAX = R THERM * EXP [ B THERM * (
1
T L _ MAX
?
1
T _ ROOM
)] = 2 . 2 * 10 3 * EXP [ 3520 * (
1
273 + 115
?
1
273 + 25
)] = 142 ?
Select R HOTSET2 = 931
to linearize the NTC, which has non-linear characteristics in the operational temperature
range. Then calculate R HOTSET1 corresponding to the allowed maximum temperature TMAX.
R HOTSET 1 =
( R TMAX + R HOTSET 2 ) * ( VCCL ? 1 .6 )
1 . 6
=
(142 + 931) * ( 7 ? 1. 6 )
1 . 6
= 3 . 63 k ? ,
choose
R HOTSET1 =3.65k .
VOLTAGE LOOP COMPENSATION
Type II compensation is used for the converter with Polymer output capacitors. Choose the crossover frequency
fc=25kHz, which is 1/10 of the switching frequency per phase, and determine Rcp and C CP .
Pre-select R FB =2.00k , and calculate R DRP , R CP and C CP .
Page 37 of 47
May 18, 2009
相关PDF资料 |
PDF描述 |
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| IR3500VMTRPBF | IC XPHASE3 CTLR VR11.1 32-MLPQ |
| IR3502AMTRPBF | IC XPHASE CTRL VR11.0/1 32-MLPQ |
| IR3502BMTRPBF | IC REG XPH INTEL VR11.1 32-MLPQ |
| IR3502MTRPBF | IC XPHASE3 CONTROLLER 32-MLPQ |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3500MTRPBF | 功能描述:开关变换器、稳压器与控制器 COMPLETE VR11.0 OR AMD PVID PWR SOLTION 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 |
| IR3500V | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM VR11.1 CPU VTT CONTROL IC |
| IR3500VMPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM VR11.1 CPU VTT CONTROL IC |
| IR3500VMTRPBF | 功能描述:开关变换器、稳压器与控制器 X-PHASE IR3500V 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 |
| IR3502 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM CONTROL IC |
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