参数资料
型号: IR3084UMPBF
厂商: International Rectifier
文件页数: 41/47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)
IR3084U
Phase Delay Timing Resistors RPHASEx1 to RPHASEx2 ( x =1,2,…,7)
The phase delay resistor ratios for phases 1 to 7 at 400kHz are (from the X?Phase Excel based design
spreadsheet); RAPHASE1=0.580, RAPHASE2=0.397, RAPHASE3=0.215, RAPHASE4=0.206,
RAPHASE5=0.353 RAPHASE6=0.5 and RAPHASE7=0.647.
Pre?select RPHASE11=RPHASE21=RPHASE31=RPHASE41=RPHASE51=RPHASE61=RPHASE71=20k ,
R PHASE 12 =
RA PHASE 1
1 ? RA PHASE 1
? R PHASE 11 =
0 . 58
1 ? 0 . 58
? 20 * 10 3 = 27 . 6 k ?
Calculating the other resistors from the same formula results in; R PHASE22 =13.2k , R PHASE32 =5.48k ,
R PHASE42 =5.2k , P PHASE52 =10.9k , R PHASE62 =20k , R PHASE72 =36.6k .
Phase ICs 1?3 should have the RMPOUT voltage from the 3084 controller connected to their RMPIN? pin so
they will trigger on the negative slope of the RMPOUT waveform. Phase ICs 4?7 should have the RMPOUT
voltage from the 3084 controller connected to their RMPIN+ pin so they will trigger on the positive slope of the
RMPOUT waveform.
Bootstrap Capacitor C BST
Choose C BST =0.1uF.
Decoupling Capacitors for Phase IC and Power Stage
Choose C VCC =0.1uF, C VCCL =0.1uF
VOLTAGE LOOP COMPENSATION
AL?Polymer output capacitors are used in the design, for instructional purposes Type III compensation as shown
in Figure 18(b) will be demonstrated here. First, choose the desired crossover frequency as 1/10 of the switching
frequency, f C =40 kHz, and determine Rcp and C CP using Equations (30) and (31):
R CP =
( 2 π * f C ) 2 * L E * C E * R FB * V PWMRMP
V o
=
( 2 π * 40 * 10 3 ) 2 * ( 220 * 10 ? 9 / 7 ) * (560 * 10 ? 6 * 10) * 324 * 0.8
1 . 30 ? 0 . 015 ? 130 * 1 * 10 ? 3
= 2 . 49 K ?
C CP =
10 * L E * C E
R CP
=
10 * ( 220 * 10 ? 9 / 7 ) * (560 * 10 ? 6 * 10)
2 . 49 * 10 3
= 53 nF ,
Choose C CP =56nF
R FB 1 =
1
2
* R FB =
1
2
* 324 = 162 ?
Choose R FB1 =162
C FB =
1
4 π * f C * R FB 1
=
1
4 π * 40 * 10 3 * 162
= 12 . 3 nF
Choose C FB =10nF
Choose C CP1 =100pF to reduce high frequency noise.
Page 41 of 47
June 1, 2009
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