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IR3080PBF датащи(PDF) 32 Page - International Rectifier

номер детали IR3080PBF
подробное описание детали  XPHASETM VRD10 CONTROL IC WITH VCCVID & OVERTEMP DETECT
PDF  41 Pages
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производитель  IRF [International Rectifier]
домашняя страница  http://www.irf.com
Logo IRF - International Rectifier

IR3080PBF датащи(HTML) 32 Page - International Rectifier

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IR3080
PbF
The power good delay time is
ms
I
V
C
t
CHG
O
DEL
SS
VccPG
85
.
2
10
*
70
)
3
.
1
28
.
1
91
.
3
(
*
10
*
15
.
0
)
3
.
1
91
.
3
(
6
6
/
=
−
−
=
−
−
∗
=
−
−
VDAC Slew Rate Programming Capacitor CVDAC and Resistor RVDAC
From Figure 15, the sink current of VDAC pin corresponding to 800kHz (ROSC=13.3kΩ) is 170uA. Calculate the
VDAC down-slope slew-rate programming capacitor from the required down-slope slew rate.
nF
SR
I
C
DOWN
SINK
VDAC
68
10
/
10
*
5
.
2
10
*
170
6
3
6
=
=
=
−
−
−
Calculate the programming resistor.
Ω
=
+
=
+
=
−
−
−
2
.
1
)
10
*
68
(
10
*
2
.
3
5
.
0
10
*
2
.
3
5
.
0
2
9
15
2
15
VDAC
VDAC
C
R
From Figure 15, the source current of VDAC pin is 250uA. The VDAC up-slope slew rate is
uS
mV
C
I
SR
VDAC
SOURCE
UP
/
7
.
3
10
*
68
10
*
250
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
64
.
0
)]
25
100
(
10
*
3850
1
[
10
*
5
.
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, the bias current of OCSET pin (IOCSET) is 90uA with
ROSC=13.3kΩ. 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,
32
.
0
6
/
135
)
2
10
*
800
12
10
*
100
/(
28
.
1
)
28
.
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
34
.
6
)
10
*
90
/(
2
.
30
*
)
10
*
55
.
0
32
.
1
10
*
64
.
0
6
135
(
6
3
3
No Load Output Voltage Setting Resistor RFB and Adaptive Voltage Positioning Resistor RDRP
From Figure 14, the bias current of FB pin is 90uA with ROSC=13.3kΩ.
Ω
=
∗
∗
−
∗
=
∗
∗
∗
−
∗
=
−
−
−
−
−
−
162
10
*
64
.
0
*
10
*
90
10
*
91
.
0
6
10
*
55
.
0
10
*
20
10
*
64
.
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
Page 32



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