IR3082M International Rectifier Corp., IR3082M Datasheet - Page 28

• Manufacturer Part Number: IR3082M
• Description: Xphasetm Amd Opterontm/athlon 64tm Control Ic
• Manufacturer: International Rectifier Corp.

VOLTAGE LOOP COMPENSATION
All ceramic output capacitors are used in the design, type III compensation as shown in Figure 18(b) is used here.
Choose the desired crossover frequency fc =80 kHz and determine Rcp and C
Choose C
CURRENT SHARE LOOP COMPENSATION
The crossover frequency of the current share loop f
loop f
Choose C
C
C
C
R
R
F
CP
MI
SCOMP
CP
FB
FB
1
=
=
=
=
=
C
2 (
(
10
R
4
V
. Choose the crossover frequency of current share loop f
1
2
=
π
π
PWMRMP
I
Page 28 of 28
=
=
⋅
⋅
. 0
−
⋅
⋅
R
CP1
12
SCOMP
. 0
R
f
f
V
65
FB
L
C
C
1
CP
PWMRMP
4 .
65
)
E
⋅
⋅
2
=220pF to reduce high frequency noise.
=
nF
R
⋅
⋅
R
⋅
⋅
C
C
18
L
PWMRMP
1
2
FB
PWMRMP
E
E
=22nF
⋅
1
2 .
⋅
230
−
V
C
=
=
⋅
o
V
E
10
10
4
DAC
⋅
⋅
=
π
R
V
3
⋅
⋅
115
FB
⋅
I
⋅
f
)
80
12
SW
⋅
⋅
(
⋅
I
(
220
V
V
O
Ω
⋅
⋅
⋅
1
10
V
100
PWMRMP
I
⋅
G
−
PWMRMP
⋅
3
V
10
CS
V
⋅
O
⋅
100
DAC
34
. 2
_
⋅
−
ROOM
2
9
31
Choose R
=
⋅
π
)
/
(
=
) 5
. 0
2 (
⋅
=
⋅
10
. 1 (
. 8
f
42
π
⋅
⋅
18
CI
(
R
3
54
⋅
33
47
⋅
80
2 .
LE
⋅
10
. 1
(
nF
12
−
⋅
⋅
⋅
⋅
05
10
10
1 [
10
−
100
FB1
3
−
, choose C
+
⋅
3
−
3
10
0
) 5
6
)
⋅
=100Ω
2
100
8 .
2
⋅
⋅
π
⋅
7
6
⋅
32
1 [
(
−
5 .
⋅
220
)
. 1
+
⋅
f
⋅
10
CI
10
=
CI
35
2
π
⋅
−
⋅
35
10
−
12
)
C
should be at least one decade lower than that of the voltage
4
⋅
⋅
FB
10
E
)
−
. 1
2 .
⋅
(
12
9
600
⋅
⋅
335
/
nF
=10nF
2
(
⋅
) 5
V
10
π
−
O
⋅
. 1
⋅
⋅
, Choose C
10
3
10
(
I
47
35
⋅
CI
O
1504
3
⋅
)]
10
⋅
)
⋅
=10kHz
0
10
⋅
8 .
F
3
−
⋅
MI
⋅
6
10
. 1
=
⋅
32
05
. 0
−
6
)
CP
011
,
⋅
⋅
⋅
and calculate C
10
. 1 (
230
=33nF
33
6
⋅
CP
0
−
8 .
100
:
=
. 2
⋅
7
31
5 .
k
⋅
Ω
10
SCOMP
−
4
)
100
,
12/17/04
]
⋅
. 0
IR3082
011