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IP1206PBF Datasheet(PDF) 21 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) 21 Page - International Rectifier

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2/26/2008
www.irf.com
21
iP1206PbF
To cancel one of the LC filter poles, place the zero
before the LC filter resonant frequency pole:
Using equations (16) and (18) to calculate C9.
One more capacitor is sometimes added in parallel
with C
9 and R4. This introduces one more pole
which is mainly used to suppress the switching
noise.
The additional pole is given by:
The pole sets to one half of switching frequency
which results in the capacitor C
POLE:
For a general solution for unconditionally stability
and any type of output capacitors, in a wide range of
ESR values we should implement local feedback
with a compensation network (typeIII). The typically
used
compensation
network
for
voltage-mode
controller is shown in Fig. 22.
In such configuration, the transfer function is given
by:
The error amplifier gain is independent of the
transconductance under the following condition:
By replacing Z
in and Zf according to figure 15, the
transformer function can be expressed as:
-(18)
-
-
-
o
o
z
LC
z
C
L
F
F
F
*
2
1
*
75
.
0
%
75
π
=
=
As known, transconductance amplifiers have
high
impedance
(current
source)
outputs,
therefore, care should be taken when loading the
E/A output. It may exceed its source/sink output
current capability, so that the amplifier will not be
able to swing its output voltage over the
necessary range.
The compensation network has three poles and
two zeros and they are expressed as follows:
Cross over frequency is expressed as:
C
C
C
C
R
2
1
F
POLE
9
POLE
9
4
P
+
=
*
*
*
π
2
F
F
For
F
R
*
1
C
1
F
R
1
C
s
P
s
4
9
s
4
POLE
<<
≅
−
=
*
*
*
π
π
VOUT
VREF
R5
R6
R8
C10
C12
C11
R7
Ve
FZ1
FZ2
FP2
FP3
E/A
Zf
ZIN
Frequency
Gain(dB)
H(s) dB
Fb
Comp
Fig. 22: Compensation network with local
feedback and its asymptotic gain plot
IN
m
f
m
o
e
Z
g
1
Z
g
1
V
V
+
−
=
(
)
[]
)
(
*
*
*
)
(
*
)
(
)
(
10
8
12
11
12
11
7
8
6
10
11
7
12
11
6
C
sR
1
C
C
C
C
sR
1
R
R
sC
1
C
sR
1
C
C
sR
1
s
H
+
⎥
⎦
⎤
⎢
⎣
⎡
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
+
+
+
+
+
=
6
10
8
6
10
2
z
11
7
1
z
12
7
12
11
12
11
7
3
P
10
8
2
P
1
P
R
C
2
1
R
R
C
2
1
F
C
R
2
1
F
C
R
2
1
C
C
C
C
R
2
1
F
C
R
2
1
F
0
F
*
*
)
(
*
*
*
*
*
*
*
*
*
*
π
π
π
π
π
π
≅
+
=
=
≅
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
=
=
=
o
o
osc
in
10
7
o
C
L
2
1
V
V
C
R
F
*
*
*
*
*
π
=
-(19)
-
-
-
1
Z
*
g
and
1
Z
*
g
in
m
f
m
>>
>>
F
R
2
1
C
z
4
9
*
*
π
=



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