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GAQ40S3V3B
DC-DC Converter Technical Manual V1.4
Qualification Testing
Parameter
High Accelerated Life
Test (HALT)
Proof Of Screen (POS)
High Accelerated
Stress Audit (HASA)
Thermal Shock
Temperature Humidity
Bias
Thermal Consideration
Thermal Test Point
Sufficient airflow should be provided to ensure reliable operating of the converter. Therefore, thermal
components are mounted on the top surface of the converter to dissipate heat to the surrounding
environment by conduction, convection and radiation. Proper airflow can be verified by measuring the
temperature at the middle of the baseplate.
Middle of the base plate
Figure 21: 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
GLOBAL ENERGY EFFICIENCY SPECIALIST
Units
Condition
Lowest operating temperature: -60°C (-76°F); highest operating
4
temperature: 110°C (230°F); vibration limit: 40 G
4
80 temperature cycles; 50% vibration limit stress: 20 G
8
4 temperature cycles; 50% vibration limit stress: 20 G
500 temperature cycles between -40°C (-40°F) and +125°C (+257°F)
with the temperature change rate of 20°C (68°F) per minute
32
Lasting for 30 minutes both at -40°C (-40°F) and +125°C (+257°F)
85°C (185°F); 85% RH; 1000 operating hours under lowest load
16
power
The temperature at the thermal test point on the converter cannot exceed
105°C (221°F). Otherwise, the converter will be protected against
overtemperature and will not operate properly.
), efficiency (ŋ), and output power (P
d
): Pd=Po(1-η)/η
o
10
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