DESIGN CONSIDERATIONS
Input Source Impedance
The impedance of the input source connecting to the DC/DC power modules will interact with the modules and affect the stability. A low
Layout and EMC Considerations
Delta’s DC/DC power modules are designed to operate in a wide variety of systems and applications. For design assistance with EMC compliance and related PWB layout issues, please contact Delta’s technical support team. An external input filter module is available for easier EMC compliance design. Application notes to assist designers in addressing these issues are pending release.
Safety Considerations
The power module must be installed in compliance with the spacing and separation requirements of the
Basic insulation based on 75 Vdc input is provided between the input and output of the module for the purpose of applying insulation requirements when the input to this
When the input source is SELV circuit, the power module meets SELV (safety
DS_E48SR15004_05222008
The input source must be insulated from the ac mains by reinforced or double insulation.
The input terminals of the module are not operator accessible.
If the metal baseplate is grounded, one Vi pin and one Vo pin shall also be grounded.
A SELV reliability test is conducted on the system where the module is used, in combination with the
module, to ensure that under a single fault, hazardous voltage does not appear at the module’s output.
When installed into a Class II equipment (without grounding), spacing consideration should be given to the
The power module has
This power module is not internally fused. To achieve optimum safety and system protection, an input line fuse is highly recommended. The safety agencies require a
Soldering and Cleaning Considerations
Post solder cleaning is usually the final board assembly process before the board or system undergoes electrical testing. Inadequate cleaning and/or drying may lower the reliability of a power module and severely affect the finished circuit board assembly test. Adequate cleaning and/or drying is especially important for
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