IP1206TRPBF International Rectifier, IP1206TRPBF Datasheet - Page 18

• Manufacturer Part Number: IP1206TRPBF
• Description: IC PWR BLOCK MULTIPHASE 30A LGA
• Manufacturer: International Rectifier
• Series: iPOWIR™r
• Type: Step-Down (Buck), PWM - Voltage Moder

Specifications of IP1206TRPBF

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1 or 2
• Voltage - Output: 0.8 V ~ 5.5 V
• Current - Output: 30A, 15A
• Frequency - Switching: 200kHz ~ 600kHz
• Voltage - Input: 7.5 V ~ 14.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: *
• Package / Case: *
• Package: LGA - 15.5 x 9.25
• Circuit: Single Output or Dual Ch
• Iout (a): 30
• Switch Freq (khz): 200 - 600
• Input Range (v): 7.5 - 14.5
• Output Range (v): 0.8 - 5.5
• Ocp Otp Uvlo Pre-bias Soft Start And: Pre-Bias + SEQ + SYNC + Tracking
• Pbf: PbF Option Available
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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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
feedback compensation section.
Fig. 19: Typical application of the iP1206 for
V
V
Δ
I
F
o
in
o
V
s
=
=
o
=
=
1
30
≤
300
12
programming the output voltage
2 .
V
30
R
V
A
V
o
5
kHz
mV
( ,
=
=
13
V
R
REF
2 .
iP1206
6
V
∗
∗
,
⎛
⎜
⎜
⎝
⎛
⎜ ⎜
⎝
max)
V
1
+
V
o
−
Fb1
ref
R
R
V
6
5
ref
⎞
⎟ ⎟
⎠
⎞
⎟
⎟
⎠
- -
- -
- -
5
(
- -
6
and R
(
)
V
7
OUT
)
R
R
5
6
6
see
2/26/2008
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
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 180
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
current
-D
-I
For Io=30A and D=0.10, the I
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:
I
RMS
RMS
1
1
and I
and D
=
is the RMS value of the input capacitor
I
(
RMS
I
2
start
1
o
2
are the output current for each channel
D
2
=
out of phase feature will reduce the
1
C
are the duty cycle for each channel
(
I
1
is the desired start-up time (ms)
O
SS
−
D
(
≅
2
1
)
D
20
+
(
1
I
μ
2
−
2
A
D
D
2
*
(
) (
1
T
iP1206PbF
+
−
start
D
2
2
−
)
RMS
−
2
2
D
- -
I I
= 12A.
)
1
)
2
- -
D
1
(
D
8
D
2
)
)
>
0.5
- -
- -
(
18
9
)