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DNL10S0A0S16PFD Datasheet(PDF) 11 Page - Delta Electronics, Inc.

Part # DNL10S0A0S16PFD
Description  Delphi DNL, Non-Isolated Point of Load DC/DC Power Modules
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Manufacturer  DELTA [Delta Electronics, Inc.]
Direct Link  http://www.deltaww.com
Logo DELTA - Delta Electronics, Inc.

DNL10S0A0S16PFD Datasheet(HTML) 11 Page - Delta Electronics, Inc.

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DS_DNL10SMD_03052009
11
FEATURE DESCRIPTIONS (CON.)
Ratio-Metric
Ratio–metric (Figure 29) is implemented by placing the
voltage divider on the TRACK pin that comprises R1 and
R2, to create a proportional voltage with VoPS1 to the
Track pin of PS2.
For Ratio-Metric applications that need the outputs of
PS1 and PS2 reach the regulation set point at the same
time
The following equation can be used to calculate the value
of R1 and R2.
The suggested value of R2 is 10kΩ.
,2
2
,1
1
2
oPS
oPS
V
R
VR
R
=
+
R1
R2
TRACK
VoPS1
PS2
VoPS2
PS1
Vin
Vin
On/Off
On/Off
The high for positive logic
The low for negative logic
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.
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
MODULE
AIR FLOW
12.7 (0.5”)
50.8 (2.0”)
FACING PWB
PWB
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
25.4 (1.0”)
Figure 30:
Wind tunnel test setup


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