11
GLOBAL ENERGY EFFICIENCY SPECIALIST
Mechanical Consideration
Installation
Although the converter can be mounted in any direction, free airflow must be taken.
Soldering
HUAWEI TECHNOLOGIES CO., LTD.
Huawei Industrial Base Bantian Longgang
Shenzhen 518129
People's Republic of China
www.huawei.com
The converter is compatible with standard wave soldering techniques. For wave soldering, the converter
pins should be preheated for 20 to 30 seconds at 110
°
C (230
°
F), and wave soldered at 260
°
C (500
°
F) for
less than 7 seconds.
For
hand soldering, the iron temperature should be maintained at 350
°
C (662
°
F) to 420
°
C (788
°
F) and
applied to the converter pins for less than 10 seconds.
The converter can be rinsed using the isopropyl alcohol (IPA) solvent or other proper solvents.
GAQ37S12B-4
DC-DC Converter Technical Manual V1.0
Thermal Consideration
Thermal Test Point
Power Dissipation
The converter power dissipation is calculated based on efficiency. The following formula reflects the
relationship between the consumed power (P
d
), efficiency (ŋ), and output power (P
o
):
Pd=Po(1-
η)/η
Decide proper airflow to be provided by measuring the temperature of the thermal resistor as shown in
Figure 21 to protect the converter against overtemperature. The overtemperature protection threshold is
also obtained based on thermal test point.
Figure 21: Thermal test point
Taking off the baseplate
Thermal resistor
