Product # PQ60012QTA40

Phone 1-888-567-9596

Doc.# 005-2QT621C Rev. C

3/6/03

Page 5

Performance Curves

48Vin 1.2Vout 40A

Quarter

Quarter

Brick

Brick

82

83

84

85

86

87

88

89

90

0

100

200

300

400

500

Air Flow (LFM)

25 C

40 C

55 C

2.0

3.0

4.0

5.0

6.0

7.0

8.0

0

100

200

300

400

500

Air Flow (LFM)

25 C

40 C

55 C

60

65

70

75

80

85

90

95

100

0

4

8

12

162024

2832

3640

Load Current (A)

36 Vin

48 Vin

75 Vin

Figure 1: Efficiency at nominal output voltage vs. load current for min-

Figure 2: Efficiency at nominal output voltage and 60% rated power vs.

(nominal input voltage).

0

2

4

6

8

10

12

0

4

8

1216

2024

2832

3640

Load Current (A)

36 Vin

48 Vin

75 Vin

Figure 3: Power dissipation at nominal output voltage vs. load current

Figure 4: Power dissipation at nominal output voltage and 60% rated

0

5

10

15

20

25

30

35

40

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

perature for airflow rates of 0 LFM through 400 LFM with air flowing

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

air flowing at the rate of 200 LFM. Air is flowing across the converter

from pin 3 to pin 1 (nominal input voltage).

Semiconductor junction temperature is

within 1

°C of surface temperature