参数资料
型号: IR3521MTRPBF
厂商: International Rectifier
文件页数: 30/45页
文件大小: 0K
描述: IC CTRL XPHASE3 SVID 32-MLPQ
标准包装: 3,000
系列: XPhase3™
应用: 处理器
电流 - 电源: 10mA
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: 带卷 (TR)
IR3521
R FB _ R ?
V O _ NLOFST
I FB 1
(12)
Adaptive voltage positioning lowers the converter voltage by R O *I O, where R O is the required output impedance of
the converter. Pre-select feedback resistor R FB, and calculate the droop resistor RDRP,
R DRP 11 ?
R FB _ R ? R L _ ROOM * G CS
n ? R O
(13)
Calculate the desired effective feedback resistor at the maximum temperature R FB_M using (14)
R FB _ M ?
R DRP 11 ? R O * n
G CS ? R L _ MAX
(14)
A negative temperature constant (NTC) thermistor R THERM1 is required to sense the temperature of the power stage
for the inductor DCR thermal compensation. Pre-select the value of R THERM. R THERM must be bigger than R FB_R at
room temperature but also bigger than R FB_M at the maximum allowed temperature. R TMAX1 is defined as the NTC
thermistor resistance at maximum allowed temperature, T MAX. R TMAX1 is calculated from (15).
R TMAX 1 ? R THERM 1 * EXP [ B THERM 1 * (
1
T L _ MAX
?
1
T _ ROOM
)]
(15)
Select the series resistor R FB13 by using equation (16). R FB13 is incorporated to linearize the NTC thermistor which
has non-linear characteristics in the operational temperature range.
R FB 13 ?
( R THERM 1 ? R TMAX 1 ) 2 ? 4 * ( R THERM 1 * R TMAX 1 ? ( R THERM 1 ? R TMAX 1 ) * R FB _ R * R FB _ M /( R FB _ R ? R FB _ M )) ? ( R THERM 1 ? R TMAX 1 )
2
(16)
Use equation (17) to determine RFB11.
1
R FB 11
?
1
R FB _ R
?
1
R FB 13 ? R THERM 1
(17)
Page 30
V3.03
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