QLS25ZE View Datasheet(PDF) - Power-One Inc.
Part Name
Description
Manufacturer
QLS25ZE Datasheet PDF : 8 Pages
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engineering and understanding of the overall
safety requirements and should be performed by
qualified personnel.
Thermal Considerations
The QLS25 Series converters are designed for
natural or forced convection cooling. The maximum
allowable output current of the converters is
determined by meeting the derating criteria for all
components used in the converters. For example,
the maximum semiconductor junction temperature is
not allowed to exceed 120°C to ensure reliable long-
term operation of the converters. Contact Power-
One for the complete list of the derating criteria.
The graphs in Figures 10-12 show the maximum
output current of the QLS25 Series converters at
different ambient temperatures under both natural
and forced (longitudinal airflow direction, from pin 1
to pin 3) convection.
For example, from Figure 11, the QLS25ZE
operating at 55C can deliver up to 18A reliably with
100LFM forced air, while up to 25A reliably with
400LFM forced air.
25
20
15
10
0
100LFM
5
200LFM
300LFM
400LFM
0
25 30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (°C)
Figure 10. QLS20ZG (5V) Derating Curves
QLS25 DC-DC Series Data Sheet
25A Quarter-Brick
25
20
15
10
0
100LFM
5
200LFM
300LFM
400LFM
0
25 30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (C)
Figure 11. QLS25ZE (3.3V) Derating Curves
25
20
15
0
10
100LFM
200LFM
5
300LFM
400LFM
0
25 30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (C)
Figure 12. QLS25ZD (2.5V) Derating Curves
SEP 12, 2003 revised to OCT 26, 2006
Page 7 of 8
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