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參數(shù)資料
| 型號(hào)： | IR3082MTR |
| 廠商： | International Rectifier |
| 英文描述： | XPHASE AMD OPTERON/ATHLON 64 CONTROL IC |
| 中文描述： | XPHASE AMD皓龍/速龍64控制IC |
| 文件頁數(shù)： | 26/33頁 |
| 文件大?。?/td> | 444K |
| 代理商： | IR3082MTR |
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IR3082
Page 26 of 26
12/17/04
From Figure 15, the source current of VDAC pin is 170uA. The VDAC up-slope slew rate is
I
SR
VDAC
10
47
uS
mV
C
SOURCE
UP
/
6
10
170
9
6
=
=
=
Over Current Setting Resistor
R
OCSET
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,
+
=
R
R
ROOM
L
MAX
L
3850
1
_
_
The current sense amplifier gain is 34 at 25oC, and its gain at 101oC is calculated as,
(
10
1470
1
_
_
_
=
MAX
IC
ROOM
CS
MIN
CS
T
G
G
Set the over current limit at 115A. From Figure 14, the bias current of OCSET pin (I
OCSET
) is 65uA with
R
OSC
=18.2k
. The total current sense amplifier input offset voltage is 0.6mV, which includes the offset created by
the current sense amplifier input resistor mismatch.
Calculate constant K
P,
the ratio of inductor peak current over average current in each phase,
10
220
/(
335
.
)
335
.
12
(
/
n
I
LIMIT
R
R
/
]
)
1
[
_
_
_
+
+
=
=
+
1
=
m
T
T
(
ROOM
MAX
L
54
.
)]
25
100
(
10
3850
10
42
.
)]
10
6
3
_
6
2
30
)]
25
101
(
10
1470
1
34
)]
6
6
=
=
ROOM
T
147
.
5
/
115
)
10
600
12
)
/(
)
(
3
9
=
=
=
f
V
L
V
V
V
K
SW
I
O
O
I
P
OCSET
MIN
CS
TOFST
CS
P
MAX
L
LIMIT
n
OCSET
I
G
V
K
R
=
+
.
=
k
9
)
10
65
/(
2
30
)
10
6
147
10
54
.
5
115
(
6
3
3
No Load Output Voltage Setting Resistor
R
FB
and Adaptive Voltage Positioning Resistor
R
DRP
From Figure 14, the bias current of FB pin is 65uA with R
OSC
=18.2k
.
=
_
MAX
L
FB
R
I
=
3
6
=
230
10
54
.
10
65
10
75
.
5
10
6
10
15
10
54
.
3
3
3
3
_
_
_
O
TOFST
CS
NLOFST
O
MAX
L
FB
R
n
V
V
R
R
Select RFB = 232
.
=
R
DRP
=
3
5
=
k
R
n
G
R
R
O
MIN
CS
MAX
L
FB
01
.
10
75
.
2
30
10
54
.
232
3
_
_
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