Datasheet

DS_D12S300-1_12282009
10
THERMAL CURVES (D12S300-1)
Figure 32: Temperature measurement location* The allowed
maximum hot spot temperature is defined at 115
℃
D12S300 A_S0 Output Current vs. Ambient Temperature and Air Velocity
@ Vin =12V, Vout =0.9V (Worse Orientation)
0
10
20
30
40
50
60
70
25 35 45 55 65 75 85
Ambient Temperature (
℃
)
Output Current (A)
300LFM
600LFM
200LFM
400LFM
500LFM
100LFM
Figure 33: Output current vs. ambient temperature and air
velocity @Vin=12V, Vout=0.9V (Worse Orientation)
D12S300 A_S0 Output Current vs. Ambient Temperature and Air Velocity
@ Vin =12V, Vout =1.2V (Worse Orientation)
0
10
20
30
40
50
60
70
25 35 45 55 65 75 85
Ambient Temperature (
℃
)
Output Current (A)
300LFM
600LFM
200LFM
400LFM
500LFM
100LFM
Figure 34: Output current vs. ambient temperature and air
velocity@ Vin=12V, Vout=1.2V (Worse Orientation)
THERMAL CONSIDERATION
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. The space between the neighboring PWB
and the top of the power module is constantly kept at
6.35mm (0.25’’).
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.
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
12.7 (0.5”)
MODULE
A
IR FLOW
50.8
(
2.0”
)
FACING PWB
PWB
A
IR VELOCIT
Y
A
ND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
Figure 31: Wind tunnel test setup