参数资料
型号: IR3504MTRPBF
厂商: International Rectifier
文件页数: 30/42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)
IR3504
No Load Offset Setting Resistor RFB11, RFB13, RTHERM1 and Adaptive Voltage Positioning Resistor
RDRP11 for Output1
Define R FB_R as the effective offset resistor at room temperature equals to R FB11 //(R FB13 +R THERM1 ). Given the
offset voltage V O_NLOFST (offset above the DAC voltage) and calculating the sink current from the FB1 pin I FB1
using the equation in the ELECTRICAL CHARACTERISTICS Table, the effective offset resistor value, R FB1, can
be determined from (12).
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 + T TMAX 1 )
2
(16)
Use equation (17) to determine R FB11.
1
R FB 11
=
1
R FB _ R
?
1
R FB 13 + R THERM 1
(17)
Page 30
July 28, 2009
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