E48SH3R330_05142009

10

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’’).

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

12.7 (0.5”)

MODULE

AIR FLOW

50.8 (2.0”)

FACING PWB

PWB

AIR VELOCITY

AND AMBIENT

TEMPERATURE

MEASURED BELOW

THE MODULE

Figure 20:

Wind tunnel test setup

Thermal Derating

Heat can be removed by increasing airflow over the

module. The hottest point temperature of the module is

129℃. 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:

Case temperature measurement location.

Pin locations are for reference only.

＊

The allowed maximum hot spot temperature is defined at

E48SH3R330(Standard) Output Current vs. Ambient Temperature and Air Velocity

@Vin = 48V (Transverse Orientation)

0

5

10

15

20

25

30

25

30

35

40

45

50

55

60

65

70

75

80

85

Ambient Temperature (℃)

Output Current(A)

Natural

Convection

100LFM

200LFM

300LFM

400LFM

Figure 22:

Output current vs. ambient temperature and air