IRPP3624-12A International Rectifier, IRPP3624-12A Datasheet - Page 16

• Manufacturer Part Number: IRPP3624-12A
• Description: KIT REF DES 12A 1PH SYNC BUCK
• Manufacturer: International Rectifier
• Series: POWIR+™r

Specifications of IRPP3624-12A

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 1.8V
• Current - Output: 12A
• Voltage - Input: 10.8 ~ 13.2V
• Regulator Topology: Buck
• Frequency - Switching: 600kHz
• Board Type: Fully Populated
• Utilized Ic / Part: IR3624, IRF7823, IRF7832Z
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

Based on the frequency of the zero generated by
output capacitor and its ESR versus crossover
frequency, the compensation type can be
different.
compensation types and location of crossover
frequency.
Table1- The compensation type and location
The details of these compensation types are
discussed in application note AN-1043 which can
be downloaded from IR Web-Site.
For this design we have:
V
V
V
V
g
L
C
F
These result to:
F
F
F
Select crossover frequency:
Fo=60kHz
Since: F
selected to place the poles and zeros.
F
Compensator
type
m
o
s
LC
ESR
s/2
in
o
osc
ref
o
o
=0.82uH
=600kHz
=1.8V
TypeIII(PID)
TypeIII(PID)
=2x22uF, ESR=1.5mOhm
=1000umoh
=13.2V
Method A
Method B
<
=0.6V
=26.5kHz
=300kHz
TypII(PI)
=1.25V
=2.4MHz
F
ESR
and
LC
<F
The
of F
F
o
o
<F
≤
ESR
F
F
F
(
1/5
s/2
LC
LC
LC
table
<F
versus F
F
<F
<F
<F
~
ESR
ESR
1/10
ESR
o
o
<F
<F
vs. F
, typeIII method B is
<F
ESR
s/2
below
)
*
<F
o
o
F
<F
<F
s
o
ESR
s/2
s/2
shows
Output
capacitor
Electrolytic
, Tantalum
Tantalum,
Ceramic
ceramic
the
The following design rules will give a crossover
frequency
switching frequency. The higher the band width,
the potentially faster the load transient response.
The DC gain will be large enough to provide high
DC-regulation accuracy (typically -5dB to -12dB).
The phase margin should be greater than 45
overall stability.
Desired Phase Margin:
Calculate
C
C
C
Calculate
F
F
F
F
Select
R
Select
R
R
R
Z
Z
P
P
7
4
3
10
8
9
3
2
2
2
2
≥
=
=
=
=
=
=
=
=
=
=
2
V
g
2
2
2
16
F
F
224
2
2
π
π
π
o
m
π
o
o
:
π
:
V
−
kHz
*
*
*
C
;
*
*
*
ref
F
*
V
kHz
R
F
F
F
7
C
Z1
1
C
1
1
C
R
ref
1
1
1
1
o
Z1
P
1
3
=
7
R
7
3
=
4
*
10
−
+
+
−
≥
*
*
0
*
,
*
*
3
approximately
L
,
0
C
F
Sin
Sin
Sin
Sin
R
.
R
2K
R
R
F
o
*
33
.
Z
3
5
V
P
8
*
2
3
3
8
2
;
and
in
Ω
C
Θ
Θ
;
;
Θ
Θ
*
nF
and
−
R
;
C
C
F
o
R
R
9
;
3
Z
4
*
10
10
=
2
C
=
V
=
Select
R
;
14
7
osc
=
106
R
3.96nF,
and
9
:
2
8
:
K
;
.
C
=
1
Ω
pF
IR3624MPBF
10
K
Θ
28
,
:
Ω
F
=
,
max
R
P3
K
Select
,
0
3
Select
one-tenth
Ω
Select
.
=
=
=
26
Select
,
0.5
5K
π
3
nF
Select
Ω
:
*
,
:
R
F
:
C
:
9
s
C
R
3
=
10
4
=
:
14
=
R
100
=
of
8
K
3.9nF
2
=
Ω
K
pF
28
o
Ω
the
for
K
16
Ω