Data Sheet
February 2, 2009
Characteristic Curves
QSK033A0B Series Power Modules; DC-DC Converters
36 – 60 Vdc Input; 12Vdc Output; 33A Output Current
The following figures provide typical characteristics for the QSK033A0B (12V, 33A) at 25ºC. The figures are identical
for either positive or negative Remote On/Off logic.
V
ON/OFF
(V) (2V/div)
V
O
(V) (5V/div)
12
INPUT CURRENT, I
i
(A)
10
8
6
4
2
0
30
33
36
39
42
45
Iout=33A
Iout=16.5A
Iout=0A
48
51
54
57
60
INPUT VOLTAGE, V
O
(V)
OUTPUT VOLTAGE
On/Off VOLTAGE
14
TIME, t (10 ms/div)
Figure 1. Typical Input Characteristic at Room
Temperature.
100
95
EFFCIENCY,
η
(%)
Figure 4. Typical Start-Up Using Remote On/Off,
negative logic version shown.
OUTPUT CURRENT OUTPUT VOLTAGE
90
85
80
75
0
5
10
Vin=36V
Vin=60V
Vin=48V
15
20
25
30
35
OUTPUT CURRENT, I
O
(A)
I
O
(A) (5A/div)
V
O
(V) (200mV/div)
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.
OUTPUT CURRENT OUTPUT VOLTAGE
V
O
(V) (200mV/div)
I
O
(A) (10A/div)
OUTPUT VOLTAGE,
36 Vin
V
O
(V) (100mV/div)
48 Vin
60 Vin
TIME, t (1μs/div)
TIME, t (500
μs/div)
Figure 3. Typical Output Ripple and Noise at Room
Temperature and I
o
= I
o,max
.
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.
LINEAGE
POWER
5
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
