Data Sheet

March 27, 2008

QBK025A0B DC-DC Power Modules:

36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current

5

Characteristic Curves

The following figures provide typical characteristics for QBK025A0B (12V, 25A) at 25ºC. The figures are identical for

either positive or negative Remote On/Off logic.

0

1

2

3

4

5

6

7

8

9

10

30

35

40

45

50

55

Io=25A

Io=12.5A

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

100

0

5

10

15

20

25

Vin=36V

Vin=48V

Vin=55V

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.

55 Vin

48 Vin

36 Vin