Datasheet
DS_DCL12S0A0S20NFA_06182014 E-mail: DCDC@delta.com.tw
http://www.deltaww.com/dcdc
P14
THERMAL CONSIDERATIONS
Thermal management is an important part of the system
design. To ensure proper, reliable operation, sufficient cooling
of the power module is needed over the entire temperature
range of the module. Convection cooling is usually the
dominant mode of heat transfer.
Hence, the choice of equipment to characterize the thermal
performance of the power module is a wind tunnel.
Thermal Testing Setup
Delta’s DC/DC power modules are characterized in heated
vertical wind tunnels that simulate the thermal environments
encountered in most electronics equipment. This type of
equipment commonly uses vertically mounted circuit cards in
cabinet racks in which the power modules are mounted.
The following figure shows the wind tunnel characterization
setup. The power module is mounted on a test PWB and is
vertically positioned within the wind tunnel.
Thermal Derating
Heat can be removed by increasing airflow over the module.
To enhance system reliability, the power module should
always be operated below the maximum operating
temperature. If the temperature exceeds the maximum module
temperature, reliability of the unit may be affected.
AIR FLOW
MODULE
PWB
50.8(2.00")
AIR VELOCITY
AND AMBIENT
TEMPERATURE
SURED BELOW
THE MODULE
FANCING PWB
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
Figure 38: Wind tunnel test setup
THERMAL CURVES
AIRFLOW
Figure 39: Temperature measurement location
The allowed maximum hot spot temperature is defined at 117
℃
0
4
8
12
16
20
25 30 35 40 45 50 55 60 65 70 75 80 85
Output Current(A)
Ambient Temperature (℃)
DCL12S0A0S20NFA Output Current vs. Ambient Temperature and Air Velocity
@Vin = 12V, Vo=5.0V (Airflow From Pin10 To Pin8)
100LFM
Natural
Convection
200LFM
300LFM
400LFM
Figure 40: Output current vs. ambient temperature and air
velocity@Vin=12V, Vout=5.0V(Either Orientation)
0
4
8
12
16
20
25 30 35 40 45 50 55 60 65 70 75 80 85
Output Current(A)
Ambient Temperature (℃)
DCL12S0A0S20NFA Output Current vs. Ambient Temperature and Air Velocity
@Vin = 12V, Vo=3.3V (Airflow From Pin10 To Pin8)
100LFM
400LFM
Natural
Convection
200LFM
300LFM
Figure 41: Output current vs. ambient temperature and air
velocity@Vin=12V, Vout=3.3V(Either Orientation)