IR3081 International Rectifier Corp., IR3081 Datasheet - Page 28
IR3081
Manufacturer Part Number
IR3081
Description
Xphasetm Vr 10 Control Ic
Manufacturer
International Rectifier Corp.
Datasheet
1.IR3081.pdf
(39 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
IR3081
Manufacturer:
IR
Quantity:
20 000
Part Number:
IR3081M
Manufacturer:
IR
Quantity:
20 000
Bootstrap Capacitor C
Choose C
Decoupling Capacitors for Phase IC and Power Stage
Choose C
VOLTAGE LOOP COMPENSATION
Type II compensation is used for the converter with AL-Polymer output capacitors. Choose the crossover frequency
fc=40kHz, which is 1/10 of the switching frequency per phase, 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
R
F
CP
MI
CP
SCOMP
Page 28 of 39
=
=
=
C
2 (
10
R
. Choose the crossover frequency of current share loop f
(
V
=
PWMRMP
π
=
V
=
∗
I
∗
O
. 0
BST
VCC
CP1
SCOMP
31
−
. 0
R
*
f
65
L
V
C
65
4 .
CP
E
PWMRMP
=0.1uF
)
=47pF to reduce high frequency noise.
=0.1uF, C
nF
1
*
2
∗
*
*
+
R
∗
16
C
C
=33nF.
2 (
PWMRMP
L
E
PWMRMP
E
2 .
π
∗
=
*
*
−
C
10
10
f
V
E
C
DAC
3
VCCL
BST
∗
*
∗
*
*
*
V
R
C
12
I
FB
)
(
f
*
SW
*
220
( *
*
=0.1uF
R
∗
I
105
V
C
O
V
*
I
)
V
RAMP
∗
*
2
−
10
G
PWMRMP
*
V
V
CS
34
−
O
2
DAC
9
=
0 .
∗
_
( *
/
ROOM
2
) 6
∗
2 (
. 1 (
)
π
. 0
10
π
∗
35
∗
47
=
. 1 (
(
3
∗
560
16
f
−
*
40
CI
*
33
10
20
R
2 .
*
∗
LE
−
∗
. 1
*
10
∗
−
(
10
105
12
3
10
10
*
05
3
1 [
−
6
)
−
3
6
−
2
*
* )
*
3
*
+
*
∗
* )
0
10
CI
. 9
10
220
2
8 .
1 [
(
* 1
220
π
6
should be at least one decade lower than that of the voltage
+
)
−
1
*
10
*
. 1
2
+
=
∗
10
f
π
35
CI
2 (
71
10
−
*
4
−
π
)
*
nF
12
)
−
4
( *
9
∗
*
C
*
*
/
CI
40
10
2
12
E
) 6
, Choose C
400
π
=4kHz
( *
*
3
∗
−
∗
10
V
*
(
. 1
4
*
560
O
560
10
*
3
35
*
10
I
3
)
∗
560
,
O
*
*
and calculate C
10
3
)]
10
0
*
*
−
8 .
*
. 1
CP
6
−
F
10
6
05
∗
MI
=
=68nF
*
10
−
. 0
6
10
*
)
*
10
011
∗
*
7
365
6
. 1 (
*
10
33
∗
−
3
0
−
SCOMP
)
CP
8 .
2
105
.
=
2
*
0 .
. 9
,
k
* 1
Ω
10/01
10
IR3081
−
4
)
/04
105
* ]
. 0
011