THERMAL CONSIDERATIONS

Thermal Derating

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

Heat can be removed by increasing airflow over the module. The hottest point temperature of the module is +121°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

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

Figure 21: Hot spot temperature measured point.

 

 

on a test PWB and is vertically positioned within the

 

 

wind tunnel. The space between the neighboring PWB

＊The allowed maximum hot spot temperature is defined at 121℃

and the top of the power module is constantly kept at

 

 

 

 

 

 

 

6.35mm (0.25’’).

 

 

E48SR05012(Standard)

Output Load vs. Ambient Temperature and Air Velocity

 

 

 

Output Current(A)

 

@ Vin = 48V (Transverse Orientation)

 

 

 

 

14

 

 

 

 

 

 

FACING PWB

PWB

12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MODULE

10

 

 

Natural

 

 

 

 

 

 

 

Convection

 

 

 

 

 

 

 

 

 

 

 

 

 

8

 

 

 

100LFM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

200LFM

 

 

 

 

6

 

 

 

 

 

 

AIR VELOCITY

 

4

 

 

 

 

 

 

AND AMBIENT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TEMPERATURE

 

 

 

 

 

 

 

 

MEASURED BELOW

50.8 (2.0”)

2

 

 

 

 

 

 

THE MODULE

 

 

 

 

 

 

 

AIR FLOW

 

0

 

 

 

 

 

 

 

 

55

60

65

70

75

80

85

 

 

 

 

 

 

 

Ambient Temperature (℃)

 

 

Figure 22: Output load vs. ambient temperature and air velocity @

 

12.7 (0.5”)

Vin=48V(Transverse Orientation)

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

Figure 20: Wind tunnel test setup

 

 

 

 

 

 

 

 

DS_E48SR05012_05222008

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Delta Electronics Series E48SR manual Thermal Considerations, Thermal Curves, Thermal Derating, Thermal Testing Setup
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Series E48SR specifications

The Delta Electronics Series E48SR is a cutting-edge power supply unit designed to cater to the demanding requirements of modern electronic devices. Renowned for its compact form factor and high efficiency, the E48SR series is ideal for various industrial applications, including telecom, data communication, and industrial automation.

One of the standout features of the E48SR series is its wide input voltage range. This versatility allows the unit to operate seamlessly across different regions and power environments, accommodating everything from standard AC mains to challenging scenarios like high-voltage fluctuations. The E48SR series supports a nominal input range of 100 to 240 VAC, providing a greater degree of flexibility for global deployments.

The E48SR series is also distinguished by its high efficiency, often exceeding 90%. This not only translates to reduced energy consumption but also minimizes heat generation, enhancing the longevity and reliability of the power supply. The incorporation of advanced technologies such as active PFC (Power Factor Correction) helps in maximizing efficiency while ensuring compliance with stringent energy regulations.

Another noteworthy characteristic of the E48SR series is its robust protection features. It is equipped with overload, overvoltage, and short-circuit protections, ensuring that both the power supply and connected devices are safeguarded against potential damage. These features are crucial in industrial applications where power stability is paramount.

In terms of thermal performance, the E48SR series employs a fanless design that enhances its reliability and reduces noise levels. This makes it particularly suited for environments where silent operation is critical, such as in office or laboratory settings. The unit is also designed for easy integration, with a standard footprint that fits into various mounting configurations.

Additional features include adjustable output voltage and current limiting, allowing users to customize the power supply to meet specific application needs. The E48SR series also supports remote sensing capabilities, enabling precise voltage regulation at the load end, further enhancing its usability in demanding scenarios.

Delta Electronics has built the E48SR series with durability in mind, ensuring that it can withstand harsh operational environments. With a wide operating temperature range, this series is capable of functioning reliably in extreme conditions, making it an excellent choice for mission-critical applications.

In summary, the Delta Electronics Series E48SR combines efficient power performance, robust protection features, and reliable thermal management in a compact design, positioning it as a preferred choice for various industrial applications.
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