参数资料
型号: IR3087MPBF
厂商: International Rectifier
文件页数: 28/35页
文件大小: 0K
描述: IC XPHASE W/OVP/TM CTRL 20MLPQ
标准包装: 5
系列: XPhase™
应用: 处理器
电流 - 电源: 10mA
电源电压: 8.4 V ~ 21 V
工作温度: 0°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 20-MLPQ
供应商设备封装: 20-MLPQ(4x4)
包装: 剪切带 (CT)
IR3087PBF
IR3087 EXTERNAL COMPONENTS
PWM Ramp Resistor R PWMRMP and Capacitor C PWMRMP
Set PWM ramp magnitude V PWMRMP =0.75V. Choose 100pF 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 . 28
12 ? 800 * 10 3 ? 100 * 10 ? 12 ? [ln( 12 ? 1 . 3 ) ? ln( 12 ? 1 . 3 ? 0 . 75 )]
= 18 . 2 k ?
Inductor Current Sensing Capacitor C CS+ and Resistors R CS+ and R CS-
Choose 47nF for capacitor C CS+, and calculate R CS+,
R CS + =
L R L
C CS +
=
100 * 10 ? 9 /( 0 . 5 * 10 ? 3 )
47 * 10 ? 9
= 4 . 22 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
? 4 . 22 * 10 3 = 2 . 61 k ?
Combined Over Temperature and Phase Delay Setting Resistors R PHASEx1 , R PHASEx2 and R PHASEx3
The over temperature setting resistor divider is combined with the phase delay resistor divider. Set the temperature
threshold at 115 oC, which corresponds to the IC die temperature of 116 oC, and 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
The phase delay resistor ratios for phases 1 to 6 at 800kHz of switching frequencies are RA PHASE1 =0.665,
RA PHASE2 =0.432, RA PHASE3 =0.198, RA PHASE4 =0.206, RA PHASE5 =0.401 and RA PHASE5 =0.597 starting from down-
slope.
The over temperature setting voltage of phases 1, 2, 5, and 6 is lower than the phase delay setting voltage,
VBIAS*RA PHASEx. Pre-select R PHASE11 =10k ? ,
R PHASEx 2 =
( RA PHASEx ? V BIAS ? V HOTSET ) * R PHASEx 1
V BIAS ? ( 1 ? RA PHASEx )
=
( 0 . 665 ? 6 . 8 ? 1 . 79 ) ? 10 * 10 3
6 . 8 ? ( 1 ? 0 . 665 )
= 12 . 1 k ?
R PHASEx 3 =
V HOTSET ? R PHASEx 1
V BIAS * ( 1 ? RA PHASEx )
=
1 . 79 ? 12 . 1 * 10 3
6 . 8 * ( 1 ? 0 . 665 )
= 7 . 87 k ?
R PHASE21 =10k ? , R PHASE22 =2.94k ? , R PHASE23 =4.64k ?
R PHASE51 =10k ? , R PHASE52 =2.32k ? , R PHASE53 =4.42k ?
R PHASE61 =10k ? , R PHASE62 =8.25k ? , R PHASE63 =6.49k ?
The over temperature setting voltage of Phases 3 and 4 is higher than the phase delay setting voltage,
VBIAS*RA PHASEx. Pre-select R PHASEX1 =10k ? ,
R PHASE 32 =
( V HOTSET ? RA PHASE 3 ? V BIAS ) ? R PHASE 31
V BIAS ? V HOTSET
=
( 1 . 79 ? 0 . 198 ? 6 . 8 ) ? 10 * 10 3
6 . 8 ? 1 . 79
= 887 ?
R PHASE 33 =
RA PHASE 3 ? V BIAS * R PHASE 31
V BIAS ? V HOTSET
=
0 . 198 ? 6 . 8 ? 10 * 10 3
6 . 8 ? 1 . 79
= 2 . 67 k ?
Page 28 of 35
1/31/05
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