DESIGN CONSIDERATIONS
The input source must be insulated from the ac
mains by reinforced or double insulation.
Input Source Impedance
The input terminals of the module are not operator
accessible.
The impedance of the input source connecting to the
DC/DC power modules will interact with the modules and
affect the stability. A low ac-impedance input source is
recommended. If the source inductance is more than a
few µH, we advise adding a 10 to 100 µF electrolytic
capacitor (ESR < 0.7 Ω at 100 kHz) mounted close to the
input of the module to improve the stability.
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.
Layout and EMC Considerations
When installed into a Class II equipment (without
grounding), spacing consideration should be given to the
end-use installation, as the spacing between the module
and mounting surface have not been evaluated.
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
to release.
The power module has extra-low voltage (SELV) outputs
when all inputs are SELV.
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
normal-blow fuse with 10A maximum rating to be
installed in the ungrounded lead. A lower rated fuse can
be used based on the maximum inrush transient energy
and maximum input current.
Safety Considerations
The power module must be installed in compliance with
the spacing and separation requirements of the
end-user’s safety agency standard, i.e., UL60950-1, CSA
C22.2 NO. 60950-1 2nd and IEC 60950-1 2nd : 2005 and
EN 60950-1 2nd: 2006+A11+A1: 2010, if the system in
which the power module is to be used must meet safety
agency requirements.
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
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 DC-to-DC converter is identified as TNV-2 or
SELV. An additional evaluation is needed if the source
is other than TNV-2 or SELV.
and/or
drying
are
especially
important
for
un-encapsulated and/or open frame type power modules.
For assistance on appropriate soldering and cleaning
procedures, please contact Delta’s technical support
team.
When the input source is SELV circuit, the power module
meets SELV (safety extra-low voltage) requirements. If
the input source is a hazardous voltage which is greater
than 60 Vdc and less than or equal to 75 Vdc, for the
module’s output to meet SELV requirements, all of the
following must be met:
DS_Q48SC12008_08232011
7
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