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MCR03EZPFX1002 데이터시트(PDF) 24 Page - International Rectifier

부품명 MCR03EZPFX1002
상세설명  HIGHLY EFFICIENT INTEGRATED 6A, SYNCHRONOUS BUCK REGULATOR
PDF  35 Pages
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제조업체  IRF [International Rectifier]
홈페이지  http://www.irf.com
Logo IRF - International Rectifier

MCR03EZPFX1002 데이터시트(HTML) 24 Page - International Rectifier

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Rev 4.0
24
PD-97528
IR3856MPbF
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 IR3856.
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
130
;
*
*
2
1
:
and
,
Calculate
pF
270
:
Select
,
pF
327
;
*
*
2
1
nF
10
:
Select
nF,
94
.
10
;
*
*
2
1
k
1.65
:
Select
kΩ
1.63
;
*
*
*
*
*
2
:
and
,
Calculate
nF
2.2
C
:
Select
kHz
300
*
0.5
and
kHz
8.82
*
5
.
0
:
Select
kHz
567.1
sin
1
sin
1
kHz
63
.
7
1
sin
1
sin
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
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.
kΩ
55
.
2
Select
kΩ
2.55
R
kHz)
600
(at
μA
59.07
I
)
current
output
nominal
over
(50%
A
9
1.5
A
6
mΩ
62
.
6
1
1.25
mΩ
4
.
13
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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