Q48SC12033 Datasheet, PDF (9/28 Pages) Delta Electronics, Inc. – 400W DC/DC Power Modules

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 ac-impedance input source
is recommended. If the source inductance is more than
a few μH, we advise adding a 100μF electrolytic
capacitor (ESR < 0.2 Ω at 100 kHz) mounted close to
the input of the module to improve the stability.
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. Below is the reference
design for an input filter and tested result which can
meet class B in CISSPR 22.
Schematic:
Test result:
dBμV
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
150 kHz
1 MHz
Limits
55022MQP
55022MAV
T ransducer
8130
T races
PK+
AV
10 MHz
30 MHz
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, IEC 60950-1 2nd : 2005,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.
When the input source is SELV, 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:
 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.
 One Vout pin is grounded.
 A SELV reliability test is conducted on the system
where the module is used, in combination with the
module, to ensure 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
end-use installation, as the spacing between the module
and mounting surface have not been evaluated.
The power module has extra-low voltage (ELV) outputs
when all inputs are ELV.
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 30A 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.
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 un-encapsulated
and/or open frame type power modules. For assistance on
appropriate soldering and cleaning procedures, please
contact Delta’s technical support team.
Datasheet
DS_Q48SC12033_04062017
E-mail: [e-mail]
http://www.deltaww.com/dcdc
P9