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IR3840WM 데이터시트(PDF) 23 Page - International Rectifier

부품명 IR3840WM
상세설명  HIGHLY EFFICIENT INTEGRATED 12A SYNCHRONOUS BUCK REGULATOR
PDF  34 Pages
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제조업체  IRF [International Rectifier]
홈페이지  http://www.irf.com
Logo IRF - International Rectifier

IR3840WM 데이터시트(HTML) 23 Page - International Rectifier

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Rev 12.0
PD-97657
IR3840WMPbF
23
Detailed calculation of compensation TypeIII
kΩ
2.49
:
Select
kΩ
2.49
;
*
kΩ
3.92
:
Select
,
kΩ
3.97
;
*
*
Ω
130
:
Select
,
Ω
128
;
*
*
:
and
,
Calculate
pF
220
:
Select
,
pF
283.7
;
*
*
nF
10
:
Select
nF,
9.65
;
*
*
2
1
k
1.87
:
Select
kΩ
1.85
;
*
*
*
*
*
:
and
,
Calculate
nF
2.2
C
:
Select
kHz
300
*
0.5
and
kHz
8.82
*
.
:
Select
kHz
567.1
sin
sin
kHz
17.63
sin
sin
70
Margin
Phase
Desired
3
7
o
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
Ω
=
=
=
=
=
=
=
=
=
Θ
−
Θ
+
=
=
Θ
+
Θ
−
=
=
Θ
9
9
8
9
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
V
V
V
R
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
ref
o
ref
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
A window comparator internally sets a lower
Power Good threshold at 0.6V and an upper
Power Good threshold at 0.8V. When the voltage
at the FB pin is within the window set by these
thresholds, 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 10kΩ.
kΩ
2.15
R
Select
kΩ
2.17
R
kHz)
600
F
(at
μA
59.07
I
)
current
output
nominal
over
(50%
A
18
1.5
A
12
I
I
mΩ
7.125
1.25
mΩ
.
R
OCSet
s
OCSet
)
LIM
(
o
SET
)
on
(
DS
=
=
=
=
=
=
≅
=
=
7
7
5
*
*
(32)
...
..........
..........
)
(
)
(
R
I
R
I
I
on
DS
OCSet
OCSet
critical
L
SET
∗
=
=



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