ZD-00376 Rev. 1.1.1, 19-Feb-10 Page 10 of 20 www.power-one.com
QM48T/S14120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 14 A Output
QM48T/S14120-wxy0 (Non-parallelable version)
Load Current [Adc]
03691215
ower
ss
pa
on
0.00
3.00
6.00
9.00
12.00
15.00
18.00
72 V
48 V
36 V
Fig. 5: Power dissipation vs. load current and input voltage
for converter mounted vertically with air flowing from pin 3
to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25 C.
Fig. 7: Turn-on transient at full rated load current
(resistive) with no output capacitor at Vin = 48 V, triggered
via ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom
trace: output voltage (2 V/div.). Time scale: 2 ms/div.
Load Current [Adc]
03691215
ower
ss
pa
on
0.00
3.00
6.00
9.00
12.00
15.00
18.00
70 C
55 C
40 C
Fig. 6: Power dissipation vs. load current and ambient
temperature for converter mounted vertically with
Vin = 48 V and air flowing from pin 3 to pin 1 at a rate of
200 LFM (1.0 m/s).
Fig. 8: Turn-on transient at full rated load current (resistive)
plus 2,200 µF at Vin = 48 V, triggered via ON/OFF pin. Top
trace: ON/OFF signal (5 V/div.). Bottom trace: output oltage
(5 V/div.). Time scale: 2 ms/div
.
