E48SR1R225NRFA Delta Electronics, E48SR1R225NRFA Datasheet - Page 11

• Manufacturer Part Number: E48SR1R225NRFA
• Description: POWER MODULE DC/DC 8TH BRICK 1.2
• Manufacturer: Delta Electronics
• Series: Delphi E48SRr
• Type: Isolated with UVLOr

Specifications of E48SR1R225NRFA

• Operating Temperature: -40°C ~ 107°C
• Power (watts) - Rated: 30W
• Efficiency: 88%
• Approvals: CE, cUL, TUV, UL
• Output: 1.2V
• Number Of Outputs: 1
• Power (watts): 66W
• Mounting Type: Through Hole
• Voltage - Input: 36 ~ 75V
• Package / Case: 8-DIP Module, 1/8 Brick
• 1st Output: 1.2 VDC @ 25A
• Size / Dimension: 2.30" L x 22.8" W x 0.35" H (58.4mm x 22.8mm x 9mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• 2nd Output: -
• 3rd Output: -
• 4th Output: -

DS_E48SR1R225_05142009
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
equipment. This type of equipment commonly uses
vertically mounted circuit cards in cabinet racks in which
the power modules are mounted.
The
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’’).
Figure 20: Wind tunnel test setup
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
MEASURED BELOW
following
TEMPERATURE
AIR VELOCITY
AND AMBIENT
THE MODULE
FACING PWB
encountered
figure
AIR FLOW
shows
in
PWB
50.8 (2.0”)
MODULE
12.7 (0.5”)
the
most
wind
electronics
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.
THERMAL CURVES
Figure 21: Hot spot temperature measured point
＊
Figure 22: Output current vs. ambient temperature and air
velocity@Vin=48V(Transverse Orientation)
25
20
15
10
5
0
60
The allowed maximum hot spot temperature is defined at 107
Output Current(A)
E48SR1R225(Standard) Output Load vs. Ambient Temperature and Air Velocity
Convection
65
Natural
100LFM
@Vin=48V (Transverse Orientation)
70
200LFM
300LFM
75
80
Ambient Temperature (℃)
85
11
℃