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MCR03EZPFX1002 데이터시트(PDF) 23 Page - International Rectifier

부품명 MCR03EZPFX1002
상세설명  HIGHLY EFFICIENT INTEGRATED 3A SYNCHRONOUS BUCK REGULATOR
PDF  33 Pages
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제조업체  IRF [International Rectifier]
홈페이지  http://www.irf.com
Logo IRF - International Rectifier

MCR03EZPFX1002 데이터시트(HTML) 23 Page - International Rectifier

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Rev 16.0
23
PD-97509
IR3843AMPbF
Detailed calculation of compensation TypeIII
Ω
=
Ω
=
=
Ω
=
Ω
=
=
Ω
=
Ω
=
=
=
=
=
=
=
=
Ω
=
Ω
=
=
=
=
=
=
=
=
Θ
−
Θ
+
=
=
Θ
+
Θ
−
=
=
Θ
k
3.16
:
Select
k
3.18
;
*
k
4.99
:
Select
,
k
5
;
*
*
158
:
Select
,
160
;
*
*
:
and
,
Calculate
pF
180
:
Select
,
pF
193.62
;
*
*
nF
2
.
8
:
Select
nF,
24
.
8
;
*
*
2
1
k
74
.
2
:
Select
k
2.71
;
*
*
*
*
*
:
and
,
Calculate
nF
2.2
C
:
Select
kHz
300
*
0.5
and
kHz
7.05
*
.
:
Select
kHz
453.7
sin
sin
kHz
14.11
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
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.
Ω
=
Ω
=
=
=
=
=
≅
Ω
=
Ω
=
k
2.26
Select
k
2.33
R
kHz)
600
(at
μA
59.07
I
)
current
output
nominal
over
(50%
A
5
.
4
1.5
3A
m
30.625
1.25
m
24.5
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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