10
GLOBAL ENERGY EFFICIENCY SPECIALIST
GAQ40S3V3B
DC-DC Converter Technical Manual V1.4
Parameter
Units
Condition
High Accelerated Life
Test (HALT)
4
Lowest operating temperature: -60
°
C (-76
°
F); highest operating
temperature: 110
°
C (230
°
F); vibration limit: 40 G
Proof Of Screen (POS) 4
80 temperature cycles; 50% vibration limit stress: 20 G
High Accelerated
Stress Audit (HASA)
8
4 temperature cycles; 50% vibration limit stress: 20 G
Thermal Shock
32
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
Lasting for 30 minutes both at -40
°
C (-40
°
F) and +125
°
C (+257
°
F)
Temperature Humidity
Bias
16
85
°
C (185
°
F); 85% RH; 1000 operating hours under lowest load
power
Qualification Testing
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.
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.
Thermal Consideration
Figure 21: Thermal test point
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
Middle of the base plate
