SLDN-20D1A

39

Asia-Pacific

+86 755 298 85888

Europe, Middle East

+353 61 225 977

North America

+1 408 785 5200

© 2021 Bel Power Solutions & Protection

BCD.20113_AD

The SLDN-20D1A power modules operate in a variety of thermal environments; however, sufficient cooling should always be provided

to help ensure reliable operation.

Considerations include ambient temperature, airflow, module power dissipation, and the need for increased reliability. A reduction in

the operating temperature of the module will result in an increase in reliability. The thermal data presented here is based on physical

measurements taken in a wind tunnel. The test set-up is shown in Figure 47. The preferred airflow direction for the module is in

Figure 48.

Air

flow

x

Power Module

Wind Tunnel

PWBs

12.7_

(0.50)

76.2_

(3.0)

Probe Location

for measuring

airflow and

ambient

temperature

25.4_

(1.0)

Figure 47. Thermal Test Setup

Figure 48. Preferred airflow direction and location of hot-spot of

the module(Tref).

The thermal reference points, Tref used in the specifications are also shown in Figure 49. For reliable operation the temperatures at

these points should not exceed 120 °C. The output power of the module should not exceed the rated power of the module (Vo,set x

Io,max).

Please refer to the Application Note “Thermal Characterization Process For Open-Frame Board-Mounted Power Modules” for a

detailed discussion of thermal aspects including maximum device temperatures.