Product # DQ63318QMA04

Phone 1-888-567-9596

Doc.# 005-2DQ638H Rev. A

1/10/03

Page 7

Performance Curves

48Vin 3.3/1.8Vout 40W

1 to pin 3. 70% load (8.5A) on 3.3V output and 30% load (6.7A) on 1.8V output.

At derating points, 3.3V output decreases while 1.8V output remains unchanged.

Figure 18: Thermal plot of converter at 8.5 amp load on 3.3V ouput and

flow across the converter is from pin 1 to pin 3 (nominal input voltage).

Quarter

Quarter

Brick Dual

Brick Dual

0

1

2

3

4

5

6

7

8

9

10

11

12

0

2540

5570

85

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

0 LFM (0 m/s)

Figure 13: Maximum output power-derating curves vs. ambient air tem-

perature for airflow rates of 0 to 400 LFM, air flowing from pin 1 to pin

3. Full load (12A) on 3.3V output and no load on 1.8V output.

Figure 14: Thermal plot of converter at 12 amp load on 3.3V ouput and

across the converter is from pin 1 to pin 3 (nominal input voltage)

pin 1 to pin 3. 50% load (11A) on 1.8V output and 50% load (6A) on 3.3V output.

At derating points, 3.3V output decreases while 1.8V output remains unchanged.

0

1

2

3

4

5

6

0

2540

5570

85

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

0 LFM (0 m/s)

Figure 16: Thermal plot of converter at 5.8 amp load on 3.3V ouput

flow across the converter is from pin 1 to pin 3 (nominal input voltage)

0

1

2

3

4

5

6

7

8

9

0

25

4055

7085

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

0 LFM (0 m/s)

Semiconductor junction temperature is

within 1

°C of surface temperature

Semiconductor junction temperature is

within 1

°C of surface temperature

Semiconductor junction temperature is

within 1

°C of surface temperature