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IR3842AM Datasheet(PDF) 23 Page - International Rectifier

Part # IR3842AM
Description  HIGHLY EFFICIENT INTEGRATED 6A SYNCHRONOUS BUCK REGULATOR
PDF  34 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3842AM Datasheet(HTML) 23 Page - International Rectifier

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Rev 13.0
23
PD-97510
IR3842AMPbF
Detailed calculation of compensation TypeIII
Ω
=
Ω
=
=
Ω
=
Ω
=
=
Ω
=
Ω
=
=
=
=
=
=
=
=
Ω
=
Ω
=
=
=
=
=
=
=
=
Θ
−
Θ
+
=
=
Θ
+
Θ
−
=
=
Θ
k
2.55
:
Select
k
2.57
;
*
k
4.02
:
Select
,
k
3.97
;
*
*
130
:
Select
,
128
;
*
*
:
and
,
Calculate
pF
160
:
Select
,
pF
171.69
;
*
*
nF
5.6
:
Select
nF,
84
.
5
;
*
*
2
1
k
3.09
:
Select
k
3.08
;
*
*
*
*
*
:
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
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
Power Good threshold is internally set at 88% of
Vref. 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 10kΩ.
Ω
=
Ω
=
=
=
=
=
≅
Ω
=
Ω
=
k
2.67
Select
k
2.694
R
kHz)
600
(at
μA
59.07
I
)
current
output
nominal
over
(50%
A
9
1.5
A
6
m
17.875
1.25
m
14.3
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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