参数资料
型号: IR3082AMPBF
厂商: International Rectifier
文件页数: 26/33页
文件大小: 0K
描述: IC XPHASE CONTROL 9.6V 20-MLPQ
标准包装: 100
系列: XPhase™
应用: 处理器
电流 - 电源: 12mA
电源电压: 8.05 V ~ 16 V
工作温度: 0°C ~ 100°C
安装类型: 表面贴装
封装/外壳: 20-MLPQ
供应商设备封装: 20-MLPQ(5x5)
包装: 剪切带 (CT)
IR3082A
From Figure 15, the source current of VDAC pin is 170uA. The VDAC up-slope slew rate is
SR UP
I SOURCE
C VDAC
170 ? 10 6
47 ? 10 9
3 . 6 mV / uS
Over Current Setting Resistor R OCSET
The room temperature is 25oC and the target PCB temperature is 100 oC. The phase IC die temperature is about 1
oC higher than that of phase IC, and the inductor temperature is close to PCB temperature.
Calculate Inductor DC resistance at 100 oC,
R L _ MAX
R L _ ROOM ? [ 1   3850 ? 10 6 ? ( T L _ MAX   T ROOM )] 0 . 42 ? 10 3 ? [ 1   3850 ? 10 6 ? ( 100   25 )] 0 . 54 m :
The current sense amplifier gain is 34 at 25oC, and its gain at 101oC is calculated as,
G CS _ MIN
G CS _ ROOM ? [ 1   1470 ? 10
6
? ( T IC _ MAX   T ROOM )]
34 ? [ 1   1470 ? 10
6
? ( 101   25 )]
30 . 2
R OSC =18.2k ?  7KH WRWDO FXUUHQW VHQVH DPSOLILHU LQSXW RIIVHW YROWDJH LV    6mV, which includes the offset created by
Set the over current limit at 115A. From Figure 14, the bias current of OCSET pin (I OCSET ) is 65uA with
the current sense amplifier input resistor mismatch.
Calculate constant K P, the ratio of inductor peak current over average current in each phase,
K P
( V I   V O ) ? V O /( L ? V I ? f SW ? 2)
I LIMIT / n
( 12   1 . 335 ) ? 1 . 335 /( 220 ? 10
115 / 5
9
? 12 ? 600 ? 10 3 ? 2 )
0 . 147
R OCSET
[
R LIMIT
n
? R L _ MAX ? ( 1   K P )   V CS _ TOFST ] ? G CS _ MIN / I OCSET
(
115
5
? 0 . 54 ? 10
3
? 1 . 147   0 . 6 ? 10 3 ) ? 30 . 2 /( 65 ? 10 6 )
6 . 9 k :
No Load Output Voltage Setting Resistor R FB and Adaptive Voltage Positioning Resistor R DRP
From Figure 14, the bias current of FB pin is 65uA with R OSC =18.2k ? .
R FB
R L _ MAX ? V O _ NLOFST   V CS _ TOFST ? n ? R O
I FB ? R L _ MAX
0 . 54 ? 10
3
? 15 ? 10 3   0 . 6 ? 10 3 ? 5 ? 0 . 75 ? 10
65 ? 10 6 ? 0 . 54 ? 10 3
3
230 :
Select RFB = 232 ? .
R DRP
R FB ? R L _ MAX ? G CS _ MIN
n ? R O
Page 26 of 33
232 ? 0. 54 ? 10 3 ? 30 .2
5 ? 0 . 75 ? 10 3
1 . 01 k :
05/02/2006
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