SLIN-30E1AX Datasheet, PDF (12/26 Pages) Bel Fuse Inc. – 6.0 Vdc - 14 Vdc Input, 0.8 Vdc - 2.75 Vdc /30 A Outputs

NON-ISOLATED DC/DC CONVERTERS
6.0 Vdc - 14 Vdc Input, 0.8 Vdc - 2.75 Vdc /30 A Outputs
Jan. 11, 2010
Input Filtering
Bel Power Inc., a subsidiary of Bel Fuse Inc.
The SLIN-30E1Ax module should be connected to a low ac-impedance source. A highly inductive source can
affect the stability of the module. An input capacitor 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, low-ESR polymer and ceramic capacitors are recommended at the input of the
module. The figure below shows the input ripple voltage for various output voltages at 30A of load current with
1x22µF, 2x22 µF or 2x47 µF ceramic capacitors and an input of 12V.
400
350
1x22uF
2x22uF
300
2x47uF
250
200
150
100
50
0
0.5
1
1.5
2
2.5
Output Voltage (Vdc)
Output Filtering
The SLIN-30E1Ax modules are designed for low output ripple voltage and will meet the maximum output ripple
specification with no external capacitors. 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 ceramic and polymer are recommended to improve the dynamic response of
the module. 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 feature described later in this data sheet.
100
80
60
1x10uF External Cap
1x47uF External Cap
40
2x47uF External Cap
4x47uF External Cap
20
0
0.5
1
1.5
2
2.5
Output Voltage(Volts)
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel [phone] • Fax [phone] • www.belfuse.com
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