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 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. The module’s hottest spot is less than +114°C. 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 23: Hot spot temperature measured point

＊The allowed maximum hot spot temperature is defined at

114℃

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Q48DR1R833(Standard)

Output Load vs. Ambient Temperature and Air Velocity

 

 

110%

Output Load(%)

 

@ Vin = 48V (Transverse Orientation)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

600LFM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100%

 

 

 

 

 

 

 

 

 

 

 

500LFM

 

 

 

 

 

 

 

 

 

 

 

 

90%

 

 

 

 

 

 

 

 

 

 

 

 

 

80%

 

 

 

 

 

 

 

 

 

 

 

 

 

70%

 

 

 

 

 

 

 

 

 

 

 

 

 

60%

 

Natural

 

 

 

 

 

 

 

 

 

 

 

Convection

 

 

 

 

 

 

 

 

 

 

 

50%

 

 

 

 

 

 

 

 

 

 

 

 

 

40%

 

 

 

100LFM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

200LFM

 

 

 

 

 

 

 

30%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

300LFM

 

 

 

 

 

 

20%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

400LFM

 

 

 

 

10%

 

 

 

 

 

 

 

 

 

 

 

 

 

0%

 

 

 

 

 

 

 

 

 

 

 

 

 

20

25

30

35

40

45

50

55

60

65

70

75

80

85

 

 

 

 

 

 

 

 

 

 

 

Ambient Temperature (℃)

Figure 24: Output load vs. ambient temperature and air velocity @Vin=48V(Transverse Orientation)

FACING PWB

AIR VELOCITY

AND AMBIENT

TEMPERATURE

MEASURED BELOW

THE MODULE

PWB

MODULE

50.8 (2.0”)

AIR FLOW

12.7 (0.5”)

Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inche

Figure 22: Wind tunnel test setup

DS_Q48DR1R833_03162007

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Delta Electronics Series Q48DR manual Thermal Considerations, Thermal Curves, Thermal Testing Setup, Thermal Derating
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Series Q48DR specifications

Delta Electronics, a prominent player in power management solutions, has expanded its product portfolio with the introduction of the Series Q48DR. This versatile DC-DC converter is specifically designed to meet the rigorous demands of modern industrial, telecommunications, and networking applications. The Q48DR series is noted for its high efficiency, compact design, and wide input voltage range, making it an ideal choice for power-sensitive environments.

One of the standout features of the Q48DR series is its high efficiency rating, typically exceeding 90%. This efficiency translates into reduced energy consumption and lower thermal output, which is crucial in applications requiring continuous operation. The advanced topology employed in the Q48DR not only maximizes energy conversion but also ensures minimal power losses across a variety of loads.

The input voltage range of the Q48DR is impressively broad, accommodating inputs from 36V to 75V DC. This wide input range ensures compatibility with a variety of power systems, simplifying integration in different setups. Moreover, the output voltage is adjustable, allowing users to fine-tune the power supply to match specific application requirements, typically ranging from 12V to 3.3V.

In addition to flexibility, the Q48DR series incorporates an array of protective features. These include overload protection, over-voltage protection, and thermal shutdown. These safety mechanisms are essential for safeguarding sensitive electronic components and maintaining system reliability in demanding environments.

The construction of the Q48DR is another important aspect, with a compact design that facilitates easier installation in space-constrained applications. The converter is housed in a robust metal casing, providing EMI shielding and thermal management. This design ensures that the unit can operate reliably in harsh industrial settings while minimizing electromagnetic interference with other devices.

Furthermore, Delta Electronics places a strong emphasis on sustainability. The Q48DR series meets RoHS standards, reflecting the company's commitment to reducing environmental impact without compromising performance. With a comprehensive range of certifications, including UL and CE, the Q48DR is built to provide peace of mind to users while ensuring compliance with global standards.

In summary, the Delta Electronics Series Q48DR DC-DC converter exemplifies advanced power management through its high efficiency, versatile input/output specifications, protective features, and compact design. These characteristics make it an ideal solution for a multitude of applications in various sectors, ensuring reliable performance and ease of integration.
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