14

SLDM-06D1Ax

tech.support@psbel.com

belpowersolutions.com

13. OUTPUT FILTERING

These modules are designed for low output ripple voltage and will meet the maximum output ripple specification with suggested 2x0.047µF+1x1uF

ceramic decoupling capacitors and 1x47 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. Figure 38 provides output ripple information,

measured with a scope with its Bandwidth limited to 20MHz for different external capacitance values at various Vo and a full load current of 6A. 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 LoopTM feature described later in this data sheet.

.

Figure 38

Note: Output ripple voltage for various output voltages with external 2x47 µF, 4x47 µF, 6x47 µF or 8x47 µF ceramic capacitors at the

output (6A load). Input voltage is 12V.

14. SAFETY CONSIDERATIONS

For safety agency approval the power module must be installed in compliance with the spacing and separation requirements of the end-

use safety agency standards, i.e., UL 60950-1 2nd, CSA C22.2 No. 60950-1-07, DIN EN 60950-1:2006 + A11 (VDE0805 Teil 1 +

A11):2009-11; EN 60950-1:2006 + A11:2009-03.

For the converter output to be considered meeting the requirements of safety extra-low voltage (SELV), the input must meet SELV

requirements. The power module has extra-low voltage (ELV) outputs when all inputs are ELV.

The input to these units is to be provided with a fast acting fuse (for example, Bel Fuse SMM series) with a maximum rating of 20 A in

the positive input lead.

0

10

20

30

40

50

60

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

Output Voltage(Volts)

1x47uF Ext Cap

2x47uF Ext Cap

4x47uF Ext Cap