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IR3084 Datasheet(PDF) 39 Page - International Rectifier

Part # IR3084
Description  XPHASETM VR 10/11 CONTROL IC
PDF  45 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3084 Datasheet(HTML) 39 Page - International Rectifier

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IR3084
Page 39 of 45
07/20/2005
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 ,
Ω
=
∗
−
=
∗
−
=
k
R
RA
RA
R
PHASE
PHASE
PHASE
PHASE
6
.
27
10
*
20
58
.
0
1
58
.
0
1
3
11
1
1
12
Calculating the other resistors from the same formula results in; RPHASE22=13.2k , RPHASE32=5.48k ,
RPHASE42=5.2k , PPHASE52=10.9k , RPHASE62=20k , RPHASE72=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 CBST
Choose CBST=0.1uF.
Decoupling Capacitors for Phase IC and Power Stage
Choose CVCC=0.1uF, CVCCL=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, fC =40 kHz, and determine Rcp and CCP using Equations (30) and (31):
Ω
=
−
−
=
=
−
−
−
K
V
V
R
C
L
f
R
o
PWMRMP
FB
E
E
C
CP
49
.
2
10
*
1
*
130
015
.
0
30
.
1
8
.
0
*
324
*
)
10
*
10
*
560
(
*
)
7
/
10
*
220
(
*
)
10
*
40
*
2
(
*
*
*
*
)
*
2
(
3
6
9
2
3
2
π
π
nF
R
C
L
C
CP
E
E
CP
53
10
*
49
.
2
)
10
*
10
*
560
(
*
)
7
/
10
*
220
(
*
10
*
*
10
3
6
9
=
=
=
−
−
,
Choose CCP=56nF
Ω
=
=
=
162
324
*
2
1
*
2
1
1
FB
FB
R
R
Choose RFB1=162
nF
R
f
C
FB
C
FB
3
.
12
162
*
10
*
40
*
4
1
*
*
4
1
3
1
=
=
=
π
π
Choose CFB=10nF
Choose CCP1=100pF to reduce high frequency noise.



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