Delta Electronics Q48DC - Manual (Page 5)

DS_Q48DC12003_03112008 5
ELECTRICAL CHARACTERISTICS CURVES
60
63
66
69
72
75
78
81
84
87
90
0.3 0.7 1.1 1.5 1.9 2.3 2.7
OUTPUT CURRENT(A)
E
F
F
IC
IE
N
C
Y
(%
)
1
48Vin
75Vin
36Vin
3.0
3.8
4.6
5.4
6.2
7.0
7.8
8.6
9.4
10.2
0.3 0.7 1.1 1.5 1.9 2.3 2.7
OUTPUT CURRENT(A)
PO
W
E
R
D
ISSI
PAT
IO
N
(W
) 1
36Vin
48Vin
75Vin
Figure 1: Efficiency vs. load current for minimum, nominal, and
maximum input voltage at 25 ° C. Io1=Io2.
Figure 2: Power dissipation vs. load current for minimum,
nominal, and maximum input voltage at 25 ° C. Io1=Io2.
0.5
0.7
0.9
1.1
1.3
1.5
1.7
1.9
2.1
2.3
2.5
25 30 35 40 45 50 55 60 65 70 75
INPUT VOLTAGE (V)
INP
U
T
CU
RR
E
N
T
(
A
) 1
Figure 3: Typical input characteristics at room temperature
(Io=full load).
ELECTRICAL CHARACTERISTICS CURVES
Figure 8: Output voltage response to step-change in load
current Iout1 (75%-50%-75% of Io, max; di/dt = 0.1A/µs,
200uS/DIV)). Vin=48V. Load cap: 10µF, tantalum capacitor
and 1µF ceramic capacitor. Top trace: Vout (100mV/div),
Bottom trace: Iout (1A/div). Scope measurement should be
made using a BNC cable (length short than 20 inch). Position
the load between 51 mm and 76 mm (2inch and 3 inch) from
the module.
Figure 9: Output voltage response to step-change in load
current Iout2 (75%-50%-75% of Io, max; di/dt = 0.1A/µs,
200uS/DIV). Vin=48V. Load cap: 10µF, tantalum capacitor and
1µF ceramic capacitor. Top trace: Vout (100mV/div), Bottom
trace: Iout (1A/div). Scope measurement should be made using
a BNC cable (length short than 20 inch). Position the load
between 51 mm and 76 mm (2inch and 3 inch) from the module.