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SE1484-HF Datasheet(PDF) 5 Page - Seaward Electronics Inc.

Part # SE1484-HF
Description  3A 27V Synchronous Buck Converter
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Manufacturer  SEAWARD [Seaward Electronics Inc.]
Direct Link  http://www.seawardinc.com
Logo SEAWARD - Seaward Electronics Inc.

SE1484-HF Datasheet(HTML) 5 Page - Seaward Electronics Inc.

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Rev1.0
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., • www.seawardinc.com.cn • Page 5
9/4/2012
SE1484
3A 27V Synchronous Buck Converter
Applications
inductance value。
L based on the ripple current requirement:
Where VIN is the input voltage, VOUT is the output
voltage, fSW is the switching frequency, IOUTMAX is the
maximum output current, and KRIPPLE is the ripple
factor. Typically, choose KRIPPLE =~ 30% to correspond to
the peak-to-peak ripple current being ~30% of the
maximum output current.
With this inductor value, the peak inductor current is
IOUT•(1+KRIPPLE/2). Make sure that this peak inductor
current is less than the upper switch current limit. Finally,
select the inductor core size so that it does not saturate at
the current limit. Typical inductor values for various output
voltages are shown in Table 2.
Table 2. Typical Inductor Values
Output Voltage Setting
Figure1. Output Voltage Setting
Figure 1 shows the connections for setting the output
voltage. Select the proper ratio of the two feedback
resistors R1 and R2 based on the output voltage.
Typically, use R2≈
10KΩ and determine R1 from the
following equation:
Table1-Recommended Resistance Values:
VOUT
1V
1.2V
1.8V
2.5V
3.3V
5V
9V
L(uH)
4.7
4.7
10
10
10
10
22
VOUT
R1
R2
Input Capacitor
The input capacitor needs to be carefully selected to
maintain sufficiently low ripple at the supply input of the
converter. A low ESR Electrolytic (EC) capacitor is highly
recommended. Since large current flows in and out of this
capacitor during switching, its ESR also affects efficiency.
When EC cap is used, the input capacitance needs to be
equal to or higher than 68uF. The RMS ripple current
rating needs to be higher than 50% of the output current.
The input capacitor should be placed close to the VIN and
GND pins of the IC, with the shortest traces possible. The
input capacitor can be placed a little bit away if a small
parallel 0.1uF ceramic capacitor is placed right next to the
IC.
When Vin is >15V, pure ceramic Cin (* no EC cap) is
not recommended. This is because the ESR of a
ceramic cap is often too small, Pure ceramic Cin will work
1V
1.0K
Ω
12K
Ω
1.2V
3.0K
Ω
10K
Ω
1.8V
9.53K
Ω
10K
Ω
2.5V
16.9K
Ω
10K
Ω
3.3V
26.1K
Ω
10K
Ω
5V
44.2K
Ω
10K
Ω
12V
121K
Ω
10K
Ω
Inductor Selection
The inductor maintains a continuous current to the
output load. This inductor current has a ripple that is
dependent on the inductance value: higher inductance
reduces the peak-to-peak ripple current. The trade off
for high inductance value is the increase in inductor
core size and series resistance, and the reduction in
current handling capability. In general, select an


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