Performance Curves
Quarter
Brick
16
14
12
10
48Vin 3.3Vout 15A
I
out
(A)
8
6
4
2
0
0
25
40
55
70
85
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0 LFM (0 m/s)
Ambient Air Temperature (
o
C)
Semiconductor junction temperature is
within 1°C of surface temperature
Figure 7:
Maximum output power derating curves vs. ambient air tem-
perature for airflow rates of 0 LFM through 400 LFM with air flowing
from input to output (nominal input voltage).
Figure 8:
Thermal plot of converter at 15 amp load current with 55
°
C
air flowing at the rate of 200 LFM. Air is flowing across the converter
lengthwise from input to output.(nominal input voltage).
Figure 9:
Turn-on transient at full load (resistive load) (2 ms/div)
Ch1: Vout (1V/div)
Ch2: ON/OFF input (5V/div)
Figure 10:
Turn-on transient at zero load (2 ms/div).
Ch1: Vout (1V/div)
Ch2: ON/OFF input (5V/div)
Figure 11
:
Output voltage response to step-change in load current (50%-75%-50%
of Iout(max); dI/dt = 0.1A/µs). Load cap: 15µF, 450 m
Ω
ESR tantalum capacitor
and 1µF ceramic capacitor. Ch1: Vout (100mV/div), Ch2: Iout (5A/div).
Product # PQ60033QML15
Phone 1-888-567-9596
Figure 12
:
Output voltage response to step-change in load current (50%-75%-
50% of Iout(max): dI/dt = 5A/µs). Load cap: 470µF, 30 m
Ω
ESR tantalum
capacitor and 1µF ceramic cap. Ch1: Vout (100mV/div), Ch2: Iout (5A/div).
Doc.# 005-2QM633E Rev. B
8/16/02
Page 6
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