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IR3831MPBF Datasheet(PDF) 21 Page - International Rectifier

Part # IR3831MPBF
Description  HIGHLY EFFICIENT INTEGRATED SYNCHRONOUS BUCK REGULATOR FOR DDR APPLICATIONS
PDF  31 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3831MPBF Datasheet(HTML) 21 Page - International Rectifier

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11/05/10
21
IR3831MPbF
Detailed calculation of compensation TypeIII
Ω
=
Ω
=
=
Ω
=
Ω
=
=
=
=
=
=
=
=
Ω
=
Ω
=
=
=
=
=
=
=
=
Θ
−
Θ
+
=
=
Θ
+
Θ
−
=
=
Θ
k
6.65
:
Select
,
k
6.63
;
*
*
210
:
Select
,
215
;
*
*
:
and
,
Calculate
pF
560
:
Select
,
pF
541.34
;
*
*
nF
22
:
Select
nF,
20.47
;
*
*
2
1
k
1.47
:
Select
k
1.48
;
*
*
*
*
*
:
and
,
Calculate
nF
2.2
C
:
Select
kHz
200
*
0.5
and
kHz
5.29
*
.
:
Select
kHz
340.28
sin
sin
kHz
10.58
sin
sin
70
Margin
Phase
Desired
3
7
o
8
8
10
2
7
8
10
10
2
7
10
9
8
10
3
3
3
3
3
4
4
1
4
3
3
7
3
4
3
3
3
2
1
2
2
-
2
1
2
1
2
1
2
5
0
1
1
1
1
R
R
R
F
C
R
R
R
F
C
R
R
R
R
C
C
R
F
C
C
C
R
F
C
R
R
V
C
V
C
L
F
R
C
C
R
F
F
F
F
F
F
F
F
Z
P
P
Z
in
osc
o
o
o
s
P
Z
Z
o
P
o
Z
π
π
π
π
π
Programming the Current-Limit
The Current-Limit threshold can be set by
connecting a resistor (R
OCSET) from the SW pin
to the OCSet pin. The resistor can be calculated
by using equation (4). This resistor R
OCSET must
be placed close to the IC.
The
R
DS(on)
has
a
positive
temperature
coefficient and it should be considered for the
worst case operation.
Setting the Power Good Threshold
Power Good threshold is internally set at 0.515 V.
When the voltage at the FB pin exceeds the
threshold, PGood is asserted.
The PGood is an open drain output. Hence, it is
necessary to use a pull up resistor R
PG from
PGood pin to Vcc.
The value of the pull-up
resistor must be chosen such as to limit the
current flowing into the PGood pin, when the
output voltage is not in regulation, to less than 5
mA. A typical value used is 4.7kΩ.
Ω
=
Ω
=
=
=
=
=
≅
Ω
=
Ω
=
k
4.02
Select
k
3.99
R
kHz)
400
(at
μA
39.22
I
current)
output
nominal
over
(50%
A
12
1.5
A
8
m
13.05
1.5
m
8.7
OCSet
OCSet
)
(
)
(
7
*
*
R
F
I
I
R
s
LIM
o
SET
on
DS
(32)
...
..........
..........
)
(
)
(
R
I
R
I
I
on
DS
OCSet
OCSet
critical
L
SET
∗
=
=



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