Q48SH12033NRFH Delta Electronics, Q48SH12033NRFH Datasheet - Page 9

• Manufacturer Part Number: Q48SH12033NRFH
• Description: MODULE DC/DC 1/4 BRICK 12V 33A
• Manufacturer: Delta Electronics
• Series: DELPHIr
• Type: Isolated with UVLOr

Specifications of Q48SH12033NRFH

• Output: 12V
• Number Of Outputs: 1
• Power (watts): 400W
• Mounting Type: Through Hole
• Voltage - Input: 36 ~ 75V
• Package / Case: 6-DIP Module, 1/4 Brick
• 1st Output: 12 VDC @ 33A
• Size / Dimension: 2.28" L x 1.45" W x 0.50" H (57.9mm x 36.8mm x 12.7mm)
• Operating Temperature: -40°C ~ 103°C
• Power (watts) - Rated: 396W
• Efficiency: 94.5%
• Approvals: cUL, TUV, UL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• 3rd Output: -
• 2nd Output: -
• 4th Output: -
• Other names: 941-1003

DS_Q48SH12033_09192008
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 17: Wind tunnel test setup
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)
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
Figure 18: Temperature measurement location
* The allowed maximum hot spot temperature is defined at 121
Figure 19: Output current vs. ambient temperature and air
velocity @Vin=48V(Transverse Orientation)
THERMAL CURVES
33
30
27
24
21
18
15
12
9
6
3
0
25
Output Current (A )
30
Convectio n
Q4 8SH 12033(Sta ndard) Outpu t Current vs. Amb ient Temperatu re and Air Ve locity
Natural
35
100L FM
200LFM
40
300LFM
4 00LFM
45
@Vin = 48V (Tran sverse Orie ntation )
50
55
60
65
600LFM
70
5 00LFM
Ambient Temperature ( ℃ )
75
80
℃
85
9