IR3086AMTR International Rectifier, IR3086AMTR Datasheet - Page 28

• Manufacturer Part Number: IR3086AMTR
• Description: XPHASE Phase IC with OVP with fault overtemp detect. The IR3086AM Phase IC combined with an IR XPhase TM Control IC provides a full featured and flexible way to implement power solutions for the latest high performance CPUs and ASICs.
• Manufacturer: International Rectifier

Specifications of IR3086AMTR

• Package: 20-Lead MLPQ
• Circuit: X-Phase Phase IC
• Iout (a): 2.5A Gate Driver
• Pbf: PbF Option Available

R
Bootstrap Capacitor C
Choose C
Decoupling Capacitors for Phase IC and Power Stage
Choose C
VOLTAGE LOOP COMPENSATION
Type III compensation is used for the converter with only ceramic output capacitors. The crossover frequency and
phase margin of the voltage loop can be estimated as follows.
Choose
Choose the desired crossover frequency fc (=140kHz) around fc1 estimated above, and calculate
Choose C
CURRENT SHARE LOOP COMPENSATION
The crossover frequency of the current share loop f
loop f
Choose C

C
C
C
C
R
F
f
C
PHASE41
CP
MI
C
CP
SCOMP
FB
DRP
1
1






C
90

10
2
4
2 (
R
. Choose the crossover frequency of current share loop f
(


(
V

PWMRMP
Page 28 of 33



R

R

I


=10kΩ, R
. 0
FB
BST
VCC
A
CP1
SCOMP
FB

20

. 0
C
R
f
65
tan(
C
L
V
1
f
65
1
CP
6 .

C
E
E
PWMRMP
=0.1uF

=47pF to reduce high frequency noise.

=0.1uF, C
R
*
nF
)
R

*

2
R
DRP
*
. 0
R
2
3
FB
18
C

G
FB
C
=22nF
PWMRMP
R
) 5

1
E
L
PWMRMP
CS
2 .
)
1
DRP
R
E

PHASE42


FB

*

V
180
C


10

O
10
C
4
V
FB
R


E
DAC
3
VCCL
BST
*
FB


2
3


*

*
V
140
12
63

R
I
)

(
f
(
=768Ω, R
162
100
162
FB
SW
*
( *
*
=0.1uF
R

I
*
105
V
1
O

LE
*
10
I
*
V
V


*
10

RAMP
110
G
110
3
PWMRMP
*

V
V
. 1

CS

34
O
DAC
576
2
110
9
65
)



_
/
PHASE43
*


) 6
ROOM
2

0 (

5
)

10

6 .
2 (

(
. 1 (
5 .

62

5
(
3
*

*
22
33
2 .
18
f
10
*
10
CI


nF
R
140
*
2 .

=2.80kΩ

22
*

9
10
LE
105
3
. 1
*
, choose C

*
10

*
(
*
05
6
12
6
10
10
2
1 [
* )
*
*
3
7 .
*
. 9
*


3
62

1 [
10
CI
nF
)
100
6
* 1
. 0
2
2

)
)

6

should be at least one decade lower than that of the voltage
75

10
2

576
*
(
*

100
34

27
10
f

FB
*
CI
4
. 1

3500

nF
)
*
) 3
=5.6nF
12
1
*
162

10
3 .
C
2
*
( *
CI

E


800
12
*
9

=3.5kHz
( *

20
22
/
0 (
3500
V
) 6

*
*
O
*
5 .
. 1
10
10

10
) 3
*
(
I
3
*
22

O
10

*
3
. 1
6
)]
,
. 0
*
*
05
and calculate C

*
10
75
3
62
F
*
/
MI

10
) 6
*

6
. 1 (

. 0
6

62
011
33
146
)


162
105
kHz
*
*
SCOMP
. 0
. 9
75
* 1
IR3086A
10

. 1
,

4
65
2/13/09
)
k
105

* ]
. 0
011