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IP1206PBF Datasheet(PDF) 18 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) 18 Page - International Rectifier

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2/26/2008
www.irf.com
18
iP1206PbF
Application Information
Design Example:
The following example is a typical application for
iP1206. The application circuit is shown in
page25.
Output Voltage Programming
Output voltage is programmed by the reference
voltage and an external voltage divider. The Fb
pin is the inverting input of the error amplifier,
which is internally referenced to 0.8V. The divider
ratio is chosen to provide 0.8V at the Fb pin
when the output is at its desired value. The
output voltage is defined by using the following
equation:
When an external resistor divider is connected to
the output as shown in Fig. 19.
Equation (6) can be rewritten as:
For the calculated values of R
5
and R
6 see
feedback compensation section.
kHz
F
mV
V
A
I
V
V
V
V
V
s
o
o
o
in
300
30
30
2
.
1
max)
,
2
.
13
(
,
12
=
≤
Δ
=
=
=
)
(
R
R
V
V
REF
o
6
1
5
6
-
-
-
-
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
∗
=
Fig. 19: Typical application of the iP1206 for
programming the output voltage
)
(
V
V
V
R
R
ref
o
ref
7
6
5
-
-
-
-
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
−
∗
=
Soft-Start Programming
The soft-start timing can be programmed by
selecting the soft-start capacitance value. The
start-up time of the converter can be calculated
by using:
Where T
start is the desired start-up time (ms)
For a start-up time of 5ms, the soft-start
capacitor will be 0.1uF. Choose a ceramic
capacitor at 0.1uF.
Input Capacitor Selection
The 180o out of phase feature will reduce the
RMS value of the ripple current seen by input
capacitors.
This
reduces
numbers
of input
capacitors. The input capacitors selected must
handle both the maximum ripple RMS at highest
ambient temperature as well as the maximum
input voltage. The RMS value of current ripple for
duty cycle under 50% is expressed by:
Where:
-I
RMS is the RMS value of the input capacitor
current
-D
1 and D2 are the duty cycle for each channel
-I
1 and I2 are the output current for each channel
For Io=30A and D=0.10, the I
RMS= 12A.
Ceramic capacitors are recommended due to
their peak current capabilities, they also feature
low ESR and ESL at higher frequency which
enhance better efficiency,
Use 8x22uF, 16V ceramic capacitor from TDK
(C3225X5R1C226M).
For the single output application when the duty
cycle is larger than 50% the following equation
can be used to calculate the total RMS value
input capacitor current:
)
(
T
A
C
start
SS
8
*
20
-
-
-
-
μ
≅
Fb1
iP1206
VOUT
R5
R6
()
(
)
(
)
)
(
D
D
I
I
D
D
I
D
D
I
I
RMS
9
2
1
1
2
1
2
1
2
2
2
2
1
1
2
1
-
-
-
-
−
−
+
−
=
(
)(
)
(
)
0.5
D
D
2
2
D
1
D
2
I
I
O
RMS
>
−
+
−
=



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