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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： | 22/34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 400kHz (R
OSC
=30.1k
) is
76uA. 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.
5
)
10
*
33
(
VDAC
C
From Figure 15 of IR3081 Data Sheet, the source current of VDAC pin is 110uA. The VDAC up-slope slew rate is
I
SR
VDAC
10
*
33
nF
SR
SINK
VDAC
4
30
10
3
*
76
6
6
=
=
=
, Choose C
VDAC
=33nF
=
+
=
+
=
10
*
2
5
10
*
2
5
2
9
15
2
15
VDAC
R
uS
mV
C
SOURCE
UP
/
3
10
*
110
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
1
_
_
The current sense amplifier gain is 34 at 25oC, and its gain at 101oC is calculated as,
(
10
*
1470
1
_
_
_
=
IC
ROOM
CS
MIN
CS
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
41uA with R
OSC
=30.1k
. 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,
220
/(
33
.
)
33
.
12
(
/
n
I
LIMIT
R
R
/
]
)
1
[
_
_
_
+
+
=
=
+
=
m
T
T
(
ROOM
MAX
L
61
.
)]
25
100
(
10
*
3850
1
10
*
47
.
)]
10
*
3850
6
3
_
6
2
30
)]
25
101
(
10
*
1470
1
34
)]
6
6
=
=
ROOM
MAX
T
3
6
/
135
)
10
*
400
12
10
*
)
/(
)
(
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
3
13
)
10
*
41
/(
2
30
)
10
*
55
.
3
10
*
61
.
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, the bias current of FB pin is 41uA with R
OSC
=30.1k
.
=
_
MAX
L
FB
R
I
=
R
n
O
*
91
.
6
=
3
6
=
365
10
*
61
.
10
*
41
10
*
91
.
6
10
*
55
.
10
*
20
10
*
61
.
3
3
3
3
_
_
_
O
TOFST
CS
NLOFST
O
MAX
L
FB
R
n
V
V
R
R
=
=
k
G
R
R
R
MIN
CS
MAX
L
FB
DRP
21
.
10
2
30
10
*
61
.
365
3
3
_
_
Page 22 of 34
9/30
/04
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| IR3088APBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASETM PHASE IC WITH FAULT AND OVERTEMP DETECT |
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