SLIN-12E1A_10 Datasheet, PDF (12/26 Pages) Bel Fuse Inc. – NON-ISOLATED DC/DC CONVERTERS

NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /12 A Outputs
December 2, 2010
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Input Filtering
The SLIN-12E1Ax should be connected to a low ac-impedance source. A highly inductive source can affect
the stability of the module. Input capacitance must be placed directly adjacent to the input pin of the module,
to minimize input ripple voltage and ensure module stability.
To minimize input voltage ripple, ceramic capacitors are recommended at the input of the module. The figure
below shows the input ripple voltage for various output voltages at 12A of load current with 1x22 µF or 2x22 µF
ceramic capacitors and an input of 12V.
300
250
1x22uF
2x22uF
200
150
100
50
0
0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Output Voltage (Vdc)
Note: Input ripple voltage for various output voltages with 1x22 µF or 2x22 µF ceramic capacitors at the input
(12A load). Input voltage is 12V.
Output Filtering
The SLIN-12E1Ax modules are designed for low output ripple voltage and will meet the maximum output ripple
specification with 0.1 µF ceramic and 10 µF ceramic capacitors at the output of the module. However, additional
output filtering may be required by the system designer for a number of reasons. First, there may be a need to
further reduce the output ripple and noise of the module. Second, the dynamic response characteristics may
need to be customized to a particular load step change.
To reduce the output ripple and improve the dynamic response to a step load change, additional capacitance at
the output can be used. Low ESR polymer and ceramic capacitors are recommended to improve the dynamic
response of the module. The figure on the next page provides output ripple information for different external
capacitance values at various Vo and for a load current of 12A. For stable operation of the module, limit the
capacitance to less than the maximum output capacitance as specified in the electrical specification table.
Optimal performance of the module can be achieved by using the Tunable Loop^TM feature described later in this
data sheet.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel [phone] • Fax [phone] • www.belfuse.com
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