参数资料
型号: IR3514MTRPBF
厂商: International Rectifier
文件页数: 34/46页
文件大小: 0K
描述: IC XPHASE3 CONTROL HYBRD 40-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
安装类型: 表面贴装
封装/外壳: 40-MLPQ
供应商设备封装: 40-MLPQ(6x6)
包装: 标准包装
产品目录页面: 1383 (CN2011-ZH PDF)
其它名称: IR3514MTRPBFDKR
IR3514
IR3505 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 affect 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
(21)
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
0.1uF-1uF decoupling capacitors are required at VCC and VCCL pins of phase ICs.
Page 34 of 46
10/30/2007
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