参数资料
型号: IR3084AMPBF
厂商: International Rectifier
文件页数: 28/45页
文件大小: 0K
描述: IC XPHASE CONTROL 28-MLPQ
标准包装: 100
系列: XPhase™
应用: 处理器
电流 - 电源: 14mA
电源电压: 9.5 V ~ 16 V
工作温度: 0°C ~ 100°C
安装类型: 表面贴装
封装/外壳: 28-MLPQ
供应商设备封装: 28-MLPQ(5x5)
包装: 剪切带 (CT)
IR3084A
Over Current Setting Resistor R OCSET
The inductor DC resistance is utilized to sense the inductor current. The copper wire of the inductor has a
constant temperature coefficient of 3850 PPM, and therefore the maximum inductor DCR can be calculated from
Equation (14), where R L_MAX and R L_ROOM are the inductor DCR at maximum temperature T L_MAX and room
temperature T_ ROOM respectively.
R L_MAX ? R L_ROOM ? [1 ? 3850*10 ? 6 ? (T L_MAX ? T ROOM )]
(14)
The current sense amplifier gain of the IR3086A decreases with temperature at the rate of 1470 PPM, which
compensates part of the inductor DCR increase. The phase IC die temperature is only a couple of degrees
Celsius higher than the PCB temperature due to the low thermal impedance of MLPQ package. The minimum
current sense amplifier gain at the maximum phase IC temperature T IC_MAX is calculated from Equation (15).
G CS_MIN ? G CS_ROOM ? [1 ? 1470*10 ? 6 ? (T IC_MAX ? T ROOM )]
(15)
The over-current limit is set by the external resistor R OCSET as defined in Equation (16), where I LIMIT is the
required over current limit. I OCSET, the bias current of the OCSET pin, changes with switching frequency setting
resistor R OSC and is determined by the curve in Figure 14 on page 23. K P is the ratio of inductor peak current to
average current in each phase and is calculated from Equation (17).
R OCSET ? [
I LIMIT
n
? R L_MAX ? (1 ? K P ) ? V CS_TOFST ] ?
G CS _ MIN
I OCSET
(16)
K P ?
(V I ? V O _ FL ) ? V O _ FL /(L ? V I ? f SW ? 2)
I LIMIT /n
(17)
Where: V I is the input voltage to the converter (nominally 12V).
V O_FL is the output voltage of the converter with droop at the over-current threshold.
L is the value of the output inductors.
f SW is the switching frequency.
I LIMIT is the DC output current of the converter when the over-current fault occurs.
n is the number of phases.
Page 28 of 45
3/3/2009
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