IR3086AMTRPBF International Rectifier, IR3086AMTRPBF Datasheet - Page 22
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IR3086AMTRPBF
Manufacturer Part Number
IR3086AMTRPBF
Description
IC CTLR XPHASE 28-MLPQ
Manufacturer
International Rectifier
Series
XPhase™r
Datasheets
1.IR3086AMTRPBF.pdf
(33 pages)
2.IR3086AMTRPBF.pdf
(33 pages)
3.IR3086AMTRPBF.pdf
(33 pages)
Specifications of IR3086AMTRPBF
Package / Case
20-MLPQ
Mounting Type
Surface Mount
Current - Supply
10mA
Voltage - Supply
8.4 V ~ 14 V
Operating Temperature
0°C ~ 125°C
Applications
Processor
Package
20-Lead MLPQ
Circuit
X-Phase Phase IC
Iout (a)
2.5A Gate Driver
Pbf
PbF Option Available
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
VDAC Slew Rate Programming Capacitor C
From Figure 15 of IR3081A Data Sheet, the sink current of VDAC pin corresponding to 400kHz (R
76uA. Calculate the VDAC down-slope slew-rate programming capacitor from the required down-slope slew rate.
Calculate the programming resistor.
From Figure 15 or IR3081A Data Sheet, the source current of VDAC pin is 110uA. The VDAC up-slope slew rate is
Over Current Setting Resistor R
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,
The current sense amplifier gain is 34 at 25ºC, and its gain at 101ºC is calculated as,
Set the over current limit at 135A. From Figure 14 of IR3081A Data Sheet, the bias current of OCSET pin (I
is 41uA with R
offset created by the current sense amplifier input resistor mismatch.
Calculate constant K
No Load Output Voltage Setting Resistor R
From Figure 14 of IR3081A Data Sheet, the bias current of FB pin is 41uA with R
C
G
R
SR
R
K
R
=
R
R
L
OCSET
VDAC
VDAC
DRP
CS
FB
P
(
UP
_
135
MAX
=
_
6
=
MIN
=
=
(
V
=
=
∗
R
=
=
R
I
I
Page 22 of 33
. 0
0
C
L
SR
SOURCE
[
FB
=
R
−
5 .
VDAC
61
_
R
I
L
V
G
MAX
SINK
DOWN
LIMIT
∗
+
_
O
n
*
CS
ROOM
R
10
3
)
L
2 .
∗
C
_
OSC
_
∗
−
n
=
V
ROOM
VDAC
∗
*
I
MAX
3
V
=
O
∗
∗
LIMIT
110
R
10
∗
33
O
1 [
R
=30.1kΩ. The total current sense amplifier input offset voltage is 0.55mV, which includes the
/(
L
2
1
_
O
−
_
5 .
P,
∗
2
+
L
3 .
*
15
NLOFST
I
*
∗
MAX
G
10
3850
∗
76
*
FB
/
+
10
the ratio of inductor peak current over average current in each phase,
1 [
CS
V
n
10
=
. 0
−
−
*
I
−
∗
9
∗
0
_
6
10
−
1470
55
∗
*
5 .
MIN
3
1 (
R
10
=
f
/
−
−
L
*
+
+
10
SW
6
3
−
10
_
V
6
K
(
3 .
*
=
MAX
−
3
33
∗
CS
10
∗
P
−
6
mV
2 .
365
(
3
)
) 2
T
*
OCSET
_
=
)
−
*
+
L
TOFST
10
6
∗
10
_
V
30
/
=
∗
∗
6
30
MAX
uS
CS
−
. 0
∗
−
(
(
4 .
9
12
T
15
2 .
_
61
. 0
)
nF
IC
2
TOFST
−
∗
91
/(
−
*
T
_
=
. 1
41
n
10
, Choose C
ROOM
MAX
*
3
33
∗
10
*
−
5 .
]
FB
R
3
VDAC
10
∗
)
−
Ω
∗
−
∗
O
)]
G
3
30
−
. 1
and Adaptive Voltage Positioning Resistor R
T
CS
=
6
=
ROOM
33
)
2 .
. 0
_
and Resistor R
. 0
=
MIN
47
/(
=
13
61
VDAC
220
. 1
*
)]
.
10
/
*
21
135
k 3
=
I
10
*
−
OCSET
k
Ω
3
34
10
=33nF
Ω
∗
6 /
−
3
1 [
∗
−
9
1 [
∗
+
∗
20
3850
−
12
1470
41
*
∗
VDAC
10
*
*
400
10
10
*
−
10
3
−
*
−
6
−
6
10
∗
−
6
(
∗
. 0
100
3
∗
. 0
55
∗
(
101
61
) 2
−
*
OSC
25
*
10
=
−
10
)]
0
25
−
=30.1kΩ.
3 .
=
3
−
)]
3
. 0
∗
61
=
6
30
∗
m
Ω
. 0
2 .
91
IR3086A
*
DRP
10
1/31
−
OSC
3
=
/05
=30.1kΩ) is
365
Ω
OCSET
)