参数资料
型号: IR3503MTRPBF
厂商: International Rectifier
文件页数: 31/39页
文件大小: 0K
描述: IC CTRL XPHASE VR11.0/1 32-MLPQ
标准包装: 1
系列: XPhase3™
应用: 处理器
电流 - 电源: 8mA
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
其它名称: IR3503MTRPBFDKR
IR3503
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 T MAX
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 a
stable VCCL performance for Intel VR11.1 applications.
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 μ s 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 31 of 39
February 12, 2010
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