Data Sheet

March 27, 2008

QBW018A0B Series Power Modules, DC - DC Converters:

36 – 75Vdc Input; 12Vdc Output; 18A Output Current

6

Characteristic Curves

The following figures provide typical characteristics for the QBW018A0B (12V, 18A) at 25ºC. The figures are identical

for either positive or negative Remote On/Off logic.

0

1

2

3

4

5

6

7

30

35

40

45

50

55

60

65

70

75

Io=18A

Io=9A

Io=0A

TIME, t (500

μs/div)

Figure 1. Typical Input Characteristic at Room

Temperature

Figure 4. Typical Start-Up Using Remote On/Off,

negative logic version shown.

70

75

80

85

90

95

0

5

10

15

20

Vin=36V

Vin=48V

Vin=75V

TIME, t (200 μs/div)

Figure 2. Typical Converter Efficiency Vs. Output

current at Room Temperature

Figure 5. Typical Transient Response to Step change

in Load from 25% to 50% to 25% of Full Load at Room

Temperature and 48 Vdc Input.

TIME, t (1

μs/div)

TIME, t (200 μs/div)

Figure 3. Typical Output Ripple and Noise at Room

Figure 6. Typical Transient Response to Step Change

in Load from 50% to 75% to 50% of Full Load at Room

Temperature and 48 Vdc Input

75 Vin

48 Vin

36 Vin