IR3082A International Rectifier Corp., IR3082A Datasheet - Page 26

• Manufacturer Part Number: IR3082A
• Description: 9.6v Amd Xphasetm Control Ic
• Manufacturer: International Rectifier Corp.

From Figure 15, the source current of VDAC pin is 170uA. The VDAC up-slope slew rate is
Over Current Setting Resistor R
The room temperature is 25ºC and the target PCB temperature is 100 ºC. The phase IC die temperature is about 1
ºC higher than that of phase IC, and the inductor temperature is close to PCB temperature.
Calculate Inductor DC resistance at 100 ºC,
The current sense amplifier gain is 34 at 25ºC, and its gain at 101ºC is calculated as,
Set the over current limit at 115A. From Figure 14, the bias current of OCSET pin (I
R
the current sense amplifier input resistor mismatch.
Calculate constant K
No Load Output Voltage Setting Resistor R
From Figure 14, the bias current of FB pin is 65uA with R
Select RFB = 232
G
SR
R
K
R
R
R
L
OSC
OCSET
DRP
CS
FB
P
_
UP
MAX
_
MIN
=18.2k
(
V
R
R
I
I
Page 26 of 33
C
[
(
L
FB
SOURCE
R
115

R
VDAC
_
L
G
5
MAX
V
LIMIT
˜
_
n
R
ROOM
CS
O
L
˜
)
_
. 0
_
˜
n
˜
ROOM
˜
MAX
V
I
V
54
˜
R
˜
LIMIT
O
170
1 [
O
R
47
L
O
˜
_
/(
_
˜

10
I
MAX
NLOFST
G
˜
˜
L
.
3850
˜
1 [
FB
10
P,
/
10
CS
˜
n
V
3

the ratio of inductor peak current over average current in each phase,
˜
_
˜
˜
I
9
1470
1 (
MIN
6
. 1
R
˜
˜
10


L
147
f
_
SW
K
V
3
MAX
6
˜
6 .
CS
˜
P
10
˜
232

(
)
mV
T
) 2
_

0
L
TOFST
6
_
6 .
V
5
˜
MAX
˜
OCSET
CS
. 0
/
(
˜
˜
(
uS
T
10
. 0
12
54
_
IC

TOFST
75
˜
T
_

n
˜
3
10
MAX
ROOM
)
˜
. 1
˜
10
˜
R
335
]
30
3
˜
O

G
˜
3
)]
2 .
30
T
CS
)
˜
ROOM
/(
FB
2 .
. 1
_
. 0
. 0
65
MIN
335
42
54
and Adaptive Voltage Positioning Resistor R
˜
. 1
)]
10
˜
/
10
˜
/(
01
I
10
115
OCSET
220
6
k
34
3
:
)
˜
3
1 [
5 /
˜
˜
OSC
˜
1 [
10

15
. 6
3850

65
k 9
1470
9
˜
=18.2k .
10
˜
˜
:
12
10
˜
10
3
˜
˜
600
10
6

6
˜
˜
0
. 0
(
6
100
˜
6 .
10
˜
54
(
˜
101
3
10

6mV, which includes the offset created by
˜
˜
10
25
) 2

3
)]
25
˜
3
5
. 0
)]
. 0
˜
147
. 0
54
75
30
m
:
2 .
˜
10
3
230
OCSET
05/02/2006
IR3082A
DRP
:
) is 65uA with