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GDQ54S12B-4A DC-DC Converter
Technical Manual
Recommended Fuse
The converter has no internal fuse. To meet safety requirements, a 50 A fuse is
recommended.
Recommended Reverse Polarity Protection Circuit
Reverse polarity protection is recommended under installation and cabling
conditions where reverse polarity across the input may occur.
Figure A-2 Recommended reverse polarity protection circuits
Qualification Testing
Parameter
Highly accelerated
life test
Thermal humidity
bias
High temperature
operation bias
Power and
temperature cycling
test
Thermal Test Point
Decide proper airflow to be provided by measuring the temperature at the middle
of the baseplate shown in
overtemperature. The overtemperature protection threshold is obtained based on
this thermal test point.
Issue 02 (2021-09-03)
NO TE
This is a class A product. In residential areas, this product may cause radio interference.
Therefore, users may be required to take appropriate measures.
Condition
Low temperature limit: –60°C; high temperature limit:
110°C; vibration limit: 40 G; temperature change rate:
40°C per minute; vibration frequency range: 10–10000 Hz;
axes of vibration: X/Y/Z
Maximum input voltage; 85°C; 85% RH; 1000 operating
hours under lowest load power
Rated input voltage; operating temperature between
+45°C and +55°C; airflow rate = 0.5–5 m/s, 1000
operating hours; 50% to 80% full load
Rated input voltage; ambient temperature between –40°C
and +85°C; airflow rate = 0.5–5 m/s, 1000 cycles; 50% full
load
Copyright © Huawei Technologies Co., Ltd.
Figure A-3
to protect the converter against
A EMC Specifications
29
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