DS_Q48SQ12033_09272013

10

THERMAL CURVES

(WITHOUT HEAT SPREADER)

NTC RESISTOR

HOT SPOT1

AIRFLOW

Figure 21: * Hot spot1 and NTC resistor temperature measured

point. The allowed maximum hot spot1 temperature is defined

at 111

0

5

10

15

20

25

30

25

30

35

40

45

50

55

60

65

70

75

80

85

Output Current (A)

Ambient Temperature (℃)

Q48SQ12033(Standard) Output Current vs. Ambient Temperature and Air Velocity

@Vin = 48V (Transverse Orientation)

300LFM

200LFM

400LFM

Natural

Convection

100LFM

600LFM

500LFM

Figure 22: Output current vs. ambient temperature and air

velocity @Vin=48V(Transverse Orientation, airflow from Vin+ to

Vin-,without heat spreader)

THERMAL CURVES

(WITH HEAT SPREADER)

HOT SPOT2

AIRFLOW

Figure 23: * Hot spot2 temperature measured point. The

allowed maximum hot spot2 temperature is defined at 105

0

4

8

12

16

20

24

28

32

25

30

35

40

45

50

55

60

65

70

75

80

85

Output Current (A)

Ambient Temperature (℃)

Q48SQ12033(Standard) Output Current vs. Ambient Temperature and Air Velocity

@Vin = 48V (Transverse Orientation,With Heatspreader)

300LFM

200LFM

400LFM

500LFM

Natural

Convection

100LFM

600LFM

Figure 24: Output current vs. ambient temperature and air

velocity @Vin=48V(Transverse Orientation, airflow from Vin+ to

Vin-,with heat spreader)