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IR3088AM bảng dữ liệu(PDF) 22 Page - International Rectifier

tên linh kiện IR3088AM
Giải thích chi tiết về linh kiện  XPHASETM PHASE IC WITH FAULT AND OVERTEMP DETECT
PDF  34 Pages
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nhà sản xuất  IRF [International Rectifier]
Trang chủ  http://www.irf.com
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IR3088AM bảng dữ liệu(HTML) 22 Page - International Rectifier

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IR3088A
VDAC Slew Rate Programming Capacitor CVDAC and Resistor RVDAC
From Figure 15 of IR3081 Data Sheet, the sink current of VDAC pin corresponding to 400kHz (ROSC=30.1kΩ) is
76uA. Calculate the VDAC down-slope slew-rate programming capacitor from the required down-slope slew rate.
nF
SR
I
C
DOWN
SINK
VDAC
4
.
30
10
/
10
*
5
.
2
10
*
76
6
3
6
=
=
=
−
−
−
, Choose CVDAC=33nF
Calculate the programming resistor.
Ω
=
+
=
+
=
−
−
−
5
.
3
)
10
*
33
(
10
*
2
.
3
5
.
0
10
*
2
.
3
5
.
0
2
9
15
2
15
VDAC
VDAC
C
R
From Figure 15 of IR3081 Data Sheet, the source current of VDAC pin is 110uA. The VDAC up-slope slew rate is
uS
mV
C
I
SR
VDAC
SOURCE
UP
/
3
.
3
10
*
33
10
*
110
9
6
=
=
=
−
−
Over Current Setting Resistor ROCSET
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,
Ω
=
−
∗
+
∗
=
−
∗
+
∗
=
−
−
−
m
T
T
R
R
ROOM
MAX
L
ROOM
L
MAX
L
61
.
0
)]
25
100
(
10
*
3850
1
[
10
*
47
.
0
)]
(
10
*
3850
1
[
6
3
_
6
_
_
The current sense amplifier gain is 34 at 25ºC, and its gain at 101ºC is calculated as,
2
.
30
)]
25
101
(
10
*
1470
1
[
34
)]
(
10
*
1470
1
[
6
_
6
_
_
=
−
∗
−
∗
=
−
∗
−
∗
=
−
−
ROOM
MAX
IC
ROOM
CS
MIN
CS
T
T
G
G
Set the over current limit at 135A. From Figure 14 of IR3081 Data Sheet, the bias current of OCSET pin (IOCSET) is
41uA with ROSC=30.1kΩ. The total current sense amplifier input offset voltage is 0.55mV, which includes the offset
created by the current sense amplifier input resistor mismatch.
Calculate constant KP, the ratio of inductor peak current over average current in each phase,
3
.
0
6
/
135
)
2
10
*
400
12
10
*
220
/(
33
.
1
)
33
.
1
12
(
/
)
2
/(
)
(
3
9
=
∗
∗
∗
∗
−
=
∗
∗
∗
∗
−
=
−
n
I
f
V
L
V
V
V
K
LIMIT
SW
I
O
O
I
P
OCSET
MIN
CS
TOFST
CS
P
MAX
L
LIMIT
OCSET
I
G
V
K
R
n
R
R
/
]
)
1
(
[
_
_
_
∗
+
+
∗
∗
=
Ω
=
∗
+
∗
∗
=
−
−
−
k
3
.
13
)
10
*
41
/(
2
.
30
)
10
*
55
.
0
3
.
1
10
*
61
.
0
6
135
(
6
3
3
No Load Output Voltage Setting Resistor RFB and Adaptive Voltage Positioning Resistor RDRP
From Figure 14 of IR3081 Data, the bias current of FB pin is 41uA with ROSC=30.1kΩ.
Ω
=
∗
∗
∗
−
∗
=
∗
∗
∗
−
∗
=
−
−
−
−
−
−
365
10
*
61
.
0
10
*
41
10
*
91
.
0
6
10
*
55
.
0
10
*
20
10
*
61
.
0
3
6
3
3
3
3
_
_
_
_
MAX
L
FB
O
TOFST
CS
NLOFST
O
MAX
L
FB
R
I
R
n
V
V
R
R
Ω
=
∗
∗
∗
=
∗
∗
∗
=
−
−
k
R
n
G
R
R
R
O
MIN
CS
MAX
L
FB
DRP
21
.
1
10
*
91
.
0
6
2
.
30
10
*
61
.
0
365
3
3
_
_
Page 22 of 34
9/30/04



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