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DNS04SMD06 Datasheet(PDF) 13 Page - Delta Electronics, Inc.

Part No. DNS04SMD06
Description  Voltage and resistor-based trim
Download  17 Pages
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Manufacturer  DELTA [Delta Electronics, Inc.]
Direct Link  http://www.deltaww.com
Logo DELTA - Delta Electronics, Inc.

DNS04SMD06 Datasheet(HTML) 13 Page - Delta Electronics, Inc.

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DS_DNS04SMD6A_07182012
13
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. The height of this fan duct is constantly kept
at 25.4mm (1
’’).
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
AIR VELOCITY
AND AMBIENT
TEMPERATURE
SURED BELOW
THE MODULE
FANCING PWB
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
Figure 43: Wind tunnel test setup
THERMAL CURVES
Figure 44: Temperature measurement location
The allowed maximum hot spot temperature is defined at 127
℃
DNS04S0A0S06(Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vin=5V, Vout = 3.3V(Either Orientation)
0
1
2
3
4
5
6
7
25
35
45
55
65
75
85
Ambient Temperature (℃)
Output Current(A)
Natural
Convection
Figure 45: DNS04S0A0S06(Standard) Output current vs.
ambient temperature and air velocity@Vin=5V, Vout=3.3V(Either
Orientation)
DNS04S0A0S06(Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vin=5V, Vout = 1.5V(Either Orientation)
0
1
2
3
4
5
6
7
25
35
45
55
65
75
85
Ambient Temperature (℃)
Output Current(A)
Natural
Convection
Figure 46: DNS04S0A0S06(Standard) Output current vs.
ambient temperature and air velocity@Vin=5V, Vout=1.5V(Either
Orientation)


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