Performance Curves
Brick
Quarter
48V 15V
6.7A
out
in
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
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)
Semiconductor junction temperature is
within 1 C of surface temperature
0
25
40
55
70
85
°
Ambient Air Temperature (oC)
Figure 7: Maximum output power-derating curves vs. ambient air tem-
perature for airflow rates of 0 LFM through 400 LFM with air flowing
lengthwise from input to output (nominal input voltage).
Figure 8: Thermal plot of converter at 5.4 amp load current (81W) with
55°C air flowing at the rate of 200 LFM. Air is flowing across the con-
verter from input to output (nominal input voltage).
Figure 9: Turn-on transient at full load (resistive load) (2 ms/div).
Ch 1: Vout (5V/div)
Figure 10: Turn-on transient at zero load (2 ms/div).
Ch 1: Vout (5V/div)
Ch 2: ON/OFF input (5V/div)
Ch 2: ON/OFF input (5V/div)
Figure 11: Output voltage response to step-change in load current (50%-75%-50%
Figure 12: Output voltage response to step-change in load current (50%-75%-
of Iout(max); dI/dt = 0.1A/
µ
s). Load cap: 10
µ
F, 100 m
Ω
ESR tantalum capacitor
50% of Iout(max): dI/dt = 5A/µs). Load cap: 100µF, 30 mΩ ESR tantalum
and 1
µF ceramic capacitor. Ch 1: Vout (500mV/div), Ch 2: Iout (2A/div).
capacitor and 1
µ
F ceramic cap. Ch 1: Vout (500mV/div), Ch 2: Iout (2A/div).
Product # PQ48150QGA07
Phone 1-888-567-9596
Doc.# 005-2QG415D Rev. D
8/16/02
Page 6
SYNQOR [ SYNQOR WORLDWIDE HEADQUARTERS ]
