F48SA28025NRFB Просмотр технического описания (PDF) - Delta Electronics, Inc.

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F48SA28025NRFB

Delphi Series F48SA, 700W Full Brick Family DC/DC Power Module: 48Vin, 28Vout

Delta Electronics, Inc. 

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’’).

FACING PWB

PWB

MODULE

AIR VELOCITY

AND AMBIENT

TEMPERATURE

MEASURED BELOW

THE MODULE

AIR FLOW

50.8 (2.0”)

12.7 (0.5”)

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

Figure 19: Wind tunnel test setup

Thermal Derating

Heat can be removed by increasing airflow over the module.

The module’s maximum case temperature is 95℃. 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 20: Temperature measurement location viewed from the

IMS side

The allowed maximum hot spot temperature is defined at 95℃

F48SA28025(Standard) Output Power vs. Hot Spot Temperature

Output Power (W)

750

(Either Orientation)

700

650

600

550

500

450

400

350

25

35

45

55

65

75

85

95

Hot spot Temperature(℃)

Figure 21: Output power vs. hot spot temperature (Either

Orientation)

DS_F48SA28025_06062005

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