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参数资料
| 型号： | IR3088AM |
| 厂商： | International Rectifier |
| 英文描述： | XPHASETM PHASE IC WITH FAULT AND OVERTEMP DETECT |
| 中文描述： | XPHASETM相集成电路及超温故障检测 |
| 文件页数： | 26/34页 |
| 文件大小： | 1264K |
| 代理商： | IR3088AM |
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IR3088A
VDAC Slew Rate Programming Capacitor
C
VDAC
and Resistor
R
VDAC
From Figure 15 of IR3081 Data Sheet, the sink current of VDAC pin corresponding to 800kHz (R
OSC
=13.3k
) is
170uA. Calculate the VDAC down-slope slew-rate programming capacitor from the required down-slope slew rate.
I
C
DOWN
10
/
10
*
5
Calculate the programming resistor.
2
)
10
*
68
(
VDAC
C
From Figure 15 of IR3081 Data Sheet, the source current of VDAC pin is 250uA. The VDAC up-slope slew rate is
I
SR
VDAC
10
*
68
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,
=
+
=
T
T
R
R
ROOM
MAX
L
ROOM
L
MAX
L
10
*
5
)]
(
10
*
3850
1
_
_
_
The current sense amplifier gain is 34 at 25oC, and its gain at 101oC is calculated as,
)]
(
10
*
1470
1
_
_
_
=
=
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 (I
OCSET
) is
90uA with R
OSC
=13.3k
. 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 K
P,
the ratio of inductor peak current over average current in each phase,
10
*
100
/(
28
.
)
28
.
12
(
/
n
I
LIMIT
R
R
/
]
)
1
[
_
_
_
+
+
=
nF
SR
SINK
VDAC
68
10
3
*
170
6
6
=
=
=
=
+
=
+
=
10
*
2
5
10
*
2
5
2
9
15
2
15
VDAC
R
uS
mV
C
SOURCE
UP
/
7
10
*
250
9
6
=
=
=
=
+
m
64
.
)]
25
100
(
10
*
3850
1
6
3
6
2
30
)]
25
101
(
10
*
1470
1
34
6
6
=
32
.
6
/
135
)
10
*
800
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
34
.
)
10
*
90
/(
2
30
*
)
10
*
55
.
32
.
10
*
64
.
6
135
(
6
3
3
No Load Output Voltage Setting Resistor
R
FB
and Adaptive Voltage Positioning Resistor
R
DRP
From Figure 14 of IR3081 Data Sheet, the bias current of FB pin is 90uA with R
OSC
=13.3k
.
=
_
MAX
L
FB
R
I
=
10
*
91
.
6
O
R
n
Page 26 of 34
=
3
6
=
162
10
*
64
.
*
10
*
90
10
*
91
.
6
10
*
55
.
10
*
20
10
*
64
.
3
3
3
3
_
_
_
O
TOFST
CS
NLOFST
O
MAX
L
FB
R
n
V
V
R
R
=
=
576
2
30
*
3
10
*
64
.
162
3
_
_
MIN
CS
MAX
L
FB
DRP
R
G
R
R
9/30
/04
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