DS_NE12S06A_05202013

9

THERMAL CURVES (VERTICAL)

Figure 26: Temperature measurement location* The allowed

maximum hot spot temperature is defined at 113

℃

NE12S0A0V06(standard) Output Current vs. Ambient Temperature and Air Velocity

@Vin=12V Vout=0.9V (Either Orientation)

0

1

2

3

4

5

6

25

30

35

40

45

50

55

60

65

70

75

80

85

Natural

Convection

200LFM

Output Current (A)

Ambient Temperature (℃)

300LFM

400LFM

100LFM

Figure 27: Output current vs. ambient temperature and air

velocity @Vin=12V, Vout=0.9V (Either Orientation)

NE12S0A0V06(standard) Output Current vs. Ambient Temperature and Air Velocity

@Vin=12V Vout=2.5V (Either Orientation)

0

1

2

3

4

5

6

25

30

35

40

45

50

55

60

65

70

75

80

85

Natural

Convection

300LFM

Output Current (A)

Ambient Temperature (℃)

400LFM

500LFM

100LFM

200LFM

Figure 28: Output current vs. ambient temperature and air

velocity @Vin=12V, Vout=2.5V (Either Orientation)

THERMAL CONSIDERATION

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. 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.

MODULE

AIR FLOW

11 (0.43”)

50.8 (2.0”)

FACING PWB

PWB

AIR VELOCITY

AND AMBIENT

TEMPERATURE

MEASURED BELOW

THE MODULE

22 (0.87

”)

Note: Wind tunnel test setup figure dimensions are in

millimeters and (Inches)

Figure 25: Wind tunnel test setup