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| 型号： | IR3500MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 32/47页 |
| 文件大小： | 0K |
| 描述： | IC XPHASE3 CONTROLLER 32-MLPQ |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 1 |
| 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： | 标准包装 |
| 产品目录页面： | 1383 (CN2011-ZH PDF) |
| 其它名称： | IR3500MTRPBFDKR |
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IR3500
No Load Output Voltage Setting Resistor R VSETPT ,
A resistor between VSETPT pin and VDAC 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. R VSETPT is determined by (17), where
I VSETPT is the current flowing out of VSETPT pin as shown in Figure 23.
R VSETPT =
V O _ NLOFST
I VSETPT
(17)
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 and AMD applications.
VCCL Programming Resistor R VCCLFB1 and R VCCLFB2
Since VCCL voltage is proportional to the MOSFET gate driver loss and inversely proportional to the
MOSFET conduction loss, the optimum voltage should be chosen to maximize the converter efficiency. VCCL
linear regulator consists of an external NPN transistor, a ceramic capacitor and a programmable resistor
divider. Pre-select R VCCLFB1 , and calculate R VCCLFB2 from (18).
R VCCLFB 2 =
R VCCLFB 1 * 1. 19
VCCL ? 1 . 19
(18)
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
(19)
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 ? VCCL (max)
I drive _ avg / β min
(20)
Due to limited pull down capability of the VCCLDRV pin, make sure the following condition is satisfied.
V I (max) ? 0 . 7 ? VCCL (min)
R VCCLDRV
< 10 mA
(21)
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.
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 (22).
Page 32 of 47
May 18, 2009
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| IR3502_09 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM CONTROL IC |
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