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IP1206PBF Datasheet(PDF) 19 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) 19 Page - International Rectifier

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2/26/2008
www.irf.com
19
iP1206PbF
Inductor Selection
The inductor is selected based on output power,
operating frequency and efficiency requirements.
A low inductor value causes a large ripple
current, resulting in a smaller size, faster
response to a load transient but poor efficiency
and high output noise. Generally, the selection of
inductor value can be reduced to the choice of
desired maximum ripple current
in the
inductor. The optimum point is usually found
between 20% and 50% ripple of the output
current.
For the buck converter, the inductor value for
desired
operating
ripple
current
can
be
determined using the following relation:
Where:
For 2-phase single output application the inductor
ripple current is chosen between 10-40% of
maximum phase current
If
, then the output inductor will be:
L = 1uH
The
Delta
MPL105-1R0IR
(L
1=1uH,
25A,
R
L1=2.3mOhm) provides a low profile inductor
suitable for this application.
Use the following equation to calculate C
12 and
R
12 for current sensing:
This results to C
12=1uF and R12=402Ohm
s
o
in
F
1
D
t
t
i
L
V
V
∗
=
∗
=
−
Δ
Δ
Δ
;
)
(
i
Δ
()
)
(
F
i
V
V
V
V
L
s
in
o
o
in
10
*
-
-
-
-
Δ
∗
∗
−
=
cycle
Duty
D
time
on
Turn
t
frequency
Switching
F
current
ripple
Inductor
i
Voltage
Output
V
voltage
input
Maximum
V
s
o
in
=
=
=
=
=
=
Δ
Δ
Output Capacitor Selection
The voltage ripple and transient requirements
determine
the
output capacitors
types and
values. The criteria is normally based on the
value of the Effective Series Resistance (ESR).
However the actual capacitance value and the
Equivalent Series Inductance (ESL)
are other
contributing components, these components can
be described as:
Since the output capacitor has a major role in
overall performance of converter and determines
the result of transient response, the selection of
capacitors is critical. The iP1206 can perform
well with all types of capacitors.
As a rule the capacitor must have low enough
ESR to meet output ripple and load transient
requirements, yet have high enough ESR to
satisfy stability requirements.
The goal for this design is to meet the voltage
ripple requirement in smallest possible capacitor
size. Therefore ceramic capacitors are selected
due to low ESR and small size.
Panasonic ECJ24YB0J107M (4*100uF, 6.3V,
X5R and EIA 1210 case size) are a good choice.
In the case of tantalum or low ESR electrolytic
capacitors,
the
ESR
dominates
the
output
voltage ripple, equation (13) can be used to
calculate the required ESR for the specific
voltage ripple.
)
%(
12
o
I
i
≈
Δ
current
ripple
Inductor
I
ripple
voltage
Output
-(11)
-
-
-
L =
Δ
=
Δ
Δ
=
Δ
⎟
⎠
⎞
⎜
⎝
⎛
=
Δ
Δ
=
Δ
Δ
+
Δ
+
Δ
=
Δ
o
s
o
L
C
o
in
ESL
o
L
ESR
o
C
o
ESL
o
ESR
o
o
V
F
C
I
V
ESL
L
V
V
ESR
I
V
V
V
V
V
*
*
8
*
*
)
(
)
(
)
(
)
(
)
(
)
(
1
L
1
12
12
R
L
C
R
=
*



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