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IR3084A Datasheet(PDF) 39 Page - International Rectifier

No. de pieza IR3084A
Descripción Electrónicos  XPHASE TM VR 10/11 CONTROL IC
PDF  45 Pages
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Fabricante Electrónico  IRF [International Rectifier]
Página de inicio  http://www.irf.com
Logo IRF - International Rectifier

IR3084A Datasheet(HTML) 39 Page - International Rectifier

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IR3084A
Page 39 of 45
10/30/2006
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
íPhase 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
íselect RPHASE11=RPHASE21=RPHASE31=RPHASE41=RPHASE51=RPHASE61=RPHASE71=20kŸ
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
N  5PHASE32 N 
RPHASE42
N  3PHASE52 N  5PHASE62 N  5PHASE72 N 
Phase ICs 1
í VKRXOG KDYH WKH 503287 YROWDJH IURP WKH 3084A controller connected to their RMPINí SLQ VR
they will trigger on the negative slope of the RMPOUT waveform. Phase ICs 4
í VKRXOG KDYH WKH 503287
voltage from the 3084A 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
íPolymer 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
Ÿ
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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