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参数资料
| 型号： | IR3505ZMTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | IC XPHASE3 CTLR 2.5A 16-MLPQ |
| 标准包装： | 1 |
| 系列： | XPhase3™ |
| 应用： | 处理器 |
| 电流 - 电源： | 3mA |
| 电源电压： | 8 V ~ 16 V |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-MLPQ |
| 供应商设备封装： | 16-MLPQ（3x3） |
| 包装： | 标准包装 |
| 其它名称： | IR3505ZMTRPBFDKR |
IR3505Z
Applications information
IR3505Z EXTERNAL COMPONENTS
Inductor Current Sensing Capacitor C CS and Resistor 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 does effect 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
(1)
Bootstrap Capacitor C BST
Depending on the duty cycle and gate drive current of the phase IC, a capacitor in the range of 0.1uF to 1uF is
needed for the bootstrap circuit.
Decoupling Capacitors for Phase IC
A 0.1uF-1uF decoupling capacitor is required at the VCCL pin.
CURRENT SHARE LOOP COMPENSATION
The internal compensation of current share loop ensures that crossover frequency of the current share loop is at
least one decade lower than that of the voltage loop so that the interaction between the two loops is eliminated.
The crossover frequency of current share loop is approximately 8 kHz.
Output Voltage Bleed Resistor
The floating high side driver draws bias current from the BOOST pin (3.5mA typical). This current flows out of
the IR3505Z through the SW pin and will charge up the output capacitor when the control IC is disabled. A
bleed resistor connected from the converter output voltage to ground is required to prevent the output voltage
from exceeding the control IC Over-Voltage protection threshold. The bleed resistor can be selected using the
following equation.
R BLEED = V BLEED / (5.8mA x N)
(2)
Where V BLEED is the maximum desired output voltage pre-bias and N is the number of IR3505Z used in the
converter.
Optional phases
A converter can be designed to support more or less phases. This can be quite useful in situations where the final
load current is unknown or where increased load current may be required at some time in the future.
Figure 8 provides an application circuit that allows adjustment to the number of phases. By populating zero ohm
jumpers, or not; the number of phases can be adjusted by diverting the daisy chain timing from a 3505Z to the
next one in sequence. The effect of more or less phases on converter performance can be tested without actually
removing a 3505Z or it’s MOSFETs from the printed circuit board through use of a pull-up resistor from VCCL to
the CSIN+ pin to enable de-bug mode.
Page 14 of 20
March 17, 2009
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3506 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM DDR & VTT PHASE IC |
| IR3506MTRPBF | 功能描述:开关变换器、稳压器与控制器 XPHASE3 DDR VTT 7V 2A 3 Wire 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 |
| IR3507 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM PHASE IC |
| IR3507MPBF | 制造商:International Rectifier 功能描述: |
| IR3507MTRPBF | 功能描述:开关变换器、稳压器与控制器 XPHASE3 DDR VTT 7V 2A 3 Wire 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 |
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