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IP1206PBF Datasheet(PDF) 22 Page - International Rectifier

Part # IP1206PBF
Description  Synchronous Buck Multiphase Optimized LGA Power Block
PDF  30 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IP1206PBF Datasheet(HTML) 22 Page - International Rectifier

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2/26/2008
www.irf.com
22
iP1206PbF
Based on the frequency of the zero generated by
output capacitor and its ESR versus crossover
frequency,
the
compensation
type
can
be
different.
The
table
below
shows
the
compensation types and location of crossover
frequency.
The following design rules will give a crossover
frequency
approximately
one-sixth
of
the
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 45o for
overall stability.
Desired Phase Margin:
Compensator
type
F
ESR vs. Fo
Output
capacitor
TypII(PI)
F
LC<FESR<Fo<Fs/2
Electrolytic
, Tantalum
TypeIII(PID)
Method A
F
LC<Fo<FESR<Fs/2
Tantalum,
ceramic
TypeIII(PID)
Method B
F
LC<Fo<Fs/2<FESR
Ceramic
Ω
=
Ω
=
−
=
Ω
=
Ω
=
−
=
Ω
=
Ω
=
=
=
=
=
=
=
=
=
=
=
Ω
=
Ω
≥
≥
=
=
=
Θ
−
Θ
+
=
=
Θ
+
Θ
−
=
K
K
R
V
V
V
R
K
K
R
F
C
R
K
K
F
C
R
Calculate
nF
nF
V
R
V
C
L
F
C
pF
pF
R
F
R
F
Select
kHz
F
Sin
Sin
F
F
kHz
F
Sin
Sin
F
F
ref
o
ref
Z
P
in
osc
o
o
o
P
Z
P
o
P
Z
o
Z
2
.
39
2
.
39
;
*
9
.
16
,
9
.
13
;
*
*
2
1
2
,
96
.
1
*
*
2
1
:
,
1
,
85
.
0
;
*
*
*
*
*
2
100
,
155
;
*
*
2
1
36
.
*
81
.
6
72
.
0
*
5
.
0
:
2
.
81
1
1
*
72
.
10
1
1
*
6
5
8
2
10
6
2
10
8
7
10
7
3
2
2
2
2
2
5
5
6
6
8
8
5
6
8
10
10
12
12
12
11
11
7
Z1
11
10
12
11
7
7
m
7
s
P3
Z1
R
:
Select
,
R
R
:
Select
R
R
:
Select
R
;
R
and
R
R
C
:
Select
C
C
:
Select
C
C
5.6nF
C
:
Select
nF,
4
C
;
F
*
2
1
C
:
C
and
C
,
C
Calculate
K
R
:
Select
;
K
R
;
g
2
R
F
*
0.5
F
and
F
π
π
π
π
π
3
π
Θ
=
max
Table1- The compensation type and location
of F
ESR versus Fo
The details of these compensation types are
discussed in application note AN-1043 which can
be downloaded from the IR Web-Site.
For this design we have:
V
in=12V
V
o=1.2V
V
osc=1.25V
V
ref=0.8V
g
m=2800umoh
L
o=1uH, DCR=2.4mOhm
C
o=15x22uF, ESR= 0.33mOhm
F
s=300kHz
These result to:
F
LC=10.73kHz
(Replace L to L/2 in formula#14 for current share configuration)
F
ESR=1.46MHz
F
s/2=150kHz
Select crossover frequency:
F
o=40kHz
Since:
F
LC<Fo<Fs/2<FESR, typeIII method B is
selected to place the pole and zeros.
(
)
s
o
ESR
o
F
1/10
~
1/5
F
and
F
F
*
≤
<



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