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MCR03EZPFX4021 数据表(PDF) 24 Page - International Rectifier

部件名 MCR03EZPFX4021
功能描述  HIGHLY EFFICIENT INTEGRATED 4A, SYNCHRONOUS BUCK REGULATOR
PDF  35 Pages
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制造商  IRF [International Rectifier]
网页  http://www.irf.com
标志 IRF - International Rectifier

MCR03EZPFX4021 数据表(HTML) 24 Page - International Rectifier

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Rev 4.0
24
PD-97516
IR3853MPbF
Setting the Power Good Threshold
Power Good threshold can be programmed by
using two external resistors (R5, R7 on Page 24).
The following formula can be used to set the
threshold:
Where: 0.85*Vref is reference of the internal
comparator, for IR3853.
V
o(PGood_TH) is
the selectable output voltage
threshold for power good, for this design it is
1.53V (i.e. 0.85*1.8V).
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.
Detailed calculation of compensation Type-III
kΩ
2.55
:
Select
kΩ
2.56
kΩ
4.02
:
Select
kΩ
3.97
2
1
Ω
130
:
Select
Ω
128
;
2
1
and
Calculate
pF
220
:
Select
pF
222
2
1
nF
8.2
:
Select
nF,
43
7
;
*
2
1
k
2.43
Select
kΩ
2.44
2
:
and
,
Calculate
nF
2.2
C
:
Select
kHz
300
*
0.5
and
kHz
8.82
5
0
Select
kHz
567.1
1
1
kHz
63
7
1
1
1
70
Margin
Phase
Desired
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
3
1
4
3
3
7
3
4
3
3
7
3
2
1
2
2
o
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
Ω
=
=
=
=
=
=
=
=
=
Θ
−
Θ
+
=
=
Θ
+
Θ
−
=
=
Θ
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
:
sin
sin
F
F
.
sin
sin
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.
kΩ
2.55
Select
kΩ
2.51
R
kHz)
600
(at
μA
59.07
I
)
current
output
nominal
over
(50%
A
6
1.5
A
4
mΩ
24.687
1.25
mΩ
75
19
7
OCSet
OCSet
=
=
=
=
=
=
≅
=
=
R
F
I
I
.
R
s
)
LIM
(
o
SET
)
on
(
DS
*
*
(32)
.
..........
R
I
R
I
I
)
on
(
DS
OCSet
OCSet
)
critical
(
L
SET
∗
=
=
Select R
7=2.55KOhm
Using (24): R
5=3.97KOhm
Select R
6=4.02KOhm
(33)
-
-
1
85
0
7
6
R
*
)
V
*
.
V
(
R
ref
)
TH
_
PGood
(
o
−
=



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