Data Sheet

February 16, 2009

QSW025A0B Series Power Modules; DC-DC Converters

36 – 75Vdc Input; 12Vdc Output; 25A Output Current

5

Characteristic Curves

The following figures provide typical characteristics for the QSW025A0B (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

60

65

70

75

Iout=25A

Iout=12.5A

Iout=0A

TIME, t (20 ms/div)

Figure 1. Typical Input Characteristic at Room

Temperature.

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

negative logic version shown.

75

80

85

90

95

100

0

5

10

15

20

25

Vin=36V

Vin=48V

Vin=75V

TIME, t (500 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 (500 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.

36 Vin

48 Vin

60 Vin