参数资料
型号: IR3084AMPBF
厂商: International Rectifier
文件页数: 37/45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
Assume that room temperature is 25oC and the target PCB temperature is 100 oC. The phase IC die temperature
is usually about 1 oC higher than that of phase IC and the inductor temperature is close to PCB temperature.
Calculate the Inductor’s DC resistance at 100 oC using Equation (14);
R L_MAX ? R L_ROOM ? [1 ? 3850*10 ? 6 ? (T L_MAX ? T ROOM )] ? 0. 60 *10 ? 3 ? [1 ? 3850*10 ? 6 ? (100 ? 25)] ? 0 . 77 m ?
The current sense amplifier gain is 34 at 25oC, and its gain at 101oC is calculated using Equation (15),
G CS_MIN ? G CS_ROOM ? [1 ? 1470*10 ? 6 ? (T IC_MAX ? T ROOM )] ? 34 ? [1 ? 1470*10 ? 6 ? (101 ? 25)] ? 30. 2
Here we will set the over current shutdown threshold to 155A at maximum operating temperature. From Figure
14 on page 23, the bias current of the OCSET pin (I OCSET ) is 42.5μA with R OSC =30.1k ? . The total current sense
amplifier input offset voltage calculated previously is 0.574mV, which includes the offset created by the current
sense amplifier input resistor mismatch.
Calculate the constant K P, the ratio of inductor peak current over average current in each phase using Equation
(17);
K P ?
( V I ? V O ) ? V O /( L ? V I ? f SW ? 2 )
I LIMIT / n
?
(12 ? 1 . 18) ? 1 .18 /( 220 * 10 ? 9 ? 12 ? 400 * 10 3 ? 2 )
155 / 7
? 0 . 273
Finally, calculate the over-current setting resistor using Equation (16);
R OCSET ? [
R LIMIT
n
? R L_MAX ? (1 ? K P ) ? V CS_TOFST ] ?
G CS _ MIN
I OCSET
? (
155
7
? 0 . 77 * 10 ? 3 ? ? 1 ? 0 . 273 ? ? 0 . 574 * 10 ? 3 ) ?
30 . 2
42 . 5 * 10 ? 3
? 15.8K ?
Page 37 of 45
3/3/2009
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