参数资料
型号: IR3081AMPBF
厂商: International Rectifier
文件页数: 28/39页
文件大小: 0K
描述: IC CTRLR XPHASE VR10.0 28MLPQ
标准包装: 100
系列: XPhase™
应用: 处理器
电流 - 电源: 11mA
电源电压: 9.5 V ~ 14 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)
IR3081A
Body Braking Related Resistors R BBFB and R BBDRP
N/A. The body braking during Dynamic VID is disabled.
IR3086A EXTERNAL COMPONENTS
PWM Ramp Resistor R PWMRMP and Capacitor C PWMRMP
Set PWM ramp magnitude V PWMRMP =0.8V. Choose 220pF for PWM ramp capacitor C PWMRMP , and calculate the
resistor R PWMRMP ,
R PWMRMP =
V O
V IN ? f SW ? C PWMRMP ? [ln( V IN ? V DAC ) ? ln( V IN ? V DAC ? V PWMRMP )]
=
1 . 33
12 ? 400 * 10 3 ? 220 * 10 ? 12 ? [ln( 12 ? 1 . 35 ) ? ln( 12 ? 1 . 35 ? 0 . 8 )]
= 16 . 1 k ? , choose R PWMRMP =16.2k ?
Inductor Current Sensing Capacitor C CS+ and Resistors R CS+ and R CS-
Choose C CS+ =47nF, and calculate R CS+,
R CS + =
L R L
C CS +
=
220 * 10 ? 9 /( 0 . 47 * 10 ? 3 )
47 * 10 ? 9
= 10 . 0 k ?
The bias currents of CSIN+ and CSIN- are 0.25uA and 0.4uA respectively. Calculate resistor R CS- ,
R CS ? =
0 . 25
0 . 4
? R CS + =
0 . 25
0 . 4
? 10 . 0 * 10 3 = 6 . 2 k ? , choose R CS- =6.19k ?
Over Temperature Setting Resistors R HOTSET1 and R HOTSET2
Use central over-temperature setting and set the temperature threshold at 115 oC, which corresponds to the IC die
temperature of 116 oC. Calculate the HOTSET threshold voltage corresponding to the temperature thresholds.
V HOTSET = 4 . 73 * 10 ? 3 * T J + 1 . 241 = 4 . 73 * 10 ? 3 ? 116 + 1 . 241 = 1 . 79 V
Pre-select R HOTSET1 =10.0k ? ,
R HOTSET 2 =
R HOTSET 1 ? V HOTSET
V BIAS ? V HOTSET
=
10 * 10 3 ? 1 . 79
6 . 8 ? 1 . 79
= 3 . 57 k ?
Phase Delay Timing Resistors R PHASE1 and R PHASE2
Use central over-temperature setting and set the temperature threshold at 115 oC, which corresponds to the IC die
temperature of 116 oC. Calculate the HOTSET threshold voltage corresponding to the temperature thresholds.
The phase delay resistor ratios for phases 1 to 6 at 400kHz of switching frequencies are RA PHASE1 =0.628,
RA PHASE2 =0.415, RA PHASE3 =0.202, RA PHASE4 =0.246, RA PHASE5 =0.441 and RA PHASE5 =0.637 starting from down-
slope. Pre-select R PHASE11 =R PHASE21 =R PHASE31 =R PHASE41 =R PHASE51 = R PHASE61 =10k ? ,
R PHASE 12 =
RA PHASE 1
1 ? RA PHASE 1
? R PHASE 11 =
0 . 628
1 ? 0 . 628
? 10 * 10 3 = 16 . 9 k ?
R PHASE22 =7.15k ? , R PHASE32 =2.55k ? , R PHASE42 =3.24k ? , P PHASE52 =7.87k ? , R PHASE62 =17.4k ?
Page 28 of 39
1/31 /05
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