QLS30ZA Просмотр технического описания (PDF) - Power-One Inc.
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QLS30ZA Datasheet PDF : 8 Pages
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QLS30 Series – 30A Quarter-Brick DC/DC Converter
48V Input
1.8V, 1.5V, 1.2V Output
Data Sheet
chassis ground trace (if applicable) must be
capable of conducting a current of 1.5 times the
value of the fuse without opening. The fuse must
not be placed in the grounded input line, if any.
In order for the output of the QLS30 series
converter to be considered as SELV (Safety Extra
Low Voltage) or TNV-1, according to all IEC60950
based standards, one of the following
requirements must be met in the system design:
• If the voltage source feeding the module is
SELV or TNV-2, the output of the converter
may be grounded or ungrounded.
• If the voltage source feeding the module is
ELV, the output of the converter may be
considered SELV only if the output is
grounded per the requirements of the
standard.
• If the voltage source feeding the module is a
Hazardous Voltage Secondary Circuit, the
voltage source feeding the module must be
provided with at least Basic insulation
between the source to the converter and any
hazardous voltages. The entire system,
including the QLS30 converter, must pass a
dielectric withstand test for reinforced
insulation. Design of this type of systems
requires expert engineering and
understanding of the overall safety
requirements and should be performed by
qualified personnel.
Thermal Considerations
The QLS30 series converters are designed for
both natural and forced convection cooling. The
maximum allowable output current of the
converters is determined by meeting the derating
criteria of all electronic components used in the
power supplies. An example of the derating
criteria for the semiconductor junction
temperature is not to exceed 120°C to provide
reliable long-term operation of the converters.
Please contact Power-One for more derating
criteria for other components. The graphs in
Figures 10-12 show the maximum output current
of the QLS30 series converters at different
ambient temperatures under both natural and
forced (longitudinal airflow direction, from pin 1 to
pin 3) convection. As an example, from Figure
11, the QLS30ZA operating at 55°C can deliver
up to 25A reliably with 100LFM forced air, while
up to 29A reliably with 200LFM forced air.
35
30
25
20
0
15
100LFM
10
200LFM
300LFM
5
400LFM
0
25 30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (C)
Fig.10 QLS30ZB (1.8V) derating curves
35
30
25
20
15
0
10
100LFM
200LFM
5
300LFM
400LFM
0
25
30
35
40
45
50
55
60
65
70
75
80
Ambient Temperature (C)
Fig.11 QLS30ZA (1.5V) derating curves
35
30
25
20
0
15
100LF
10
M
5
200LF
0
25 30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (C)
Fig.12 QLS30ZY (1.2V) derating curves
.
REV. 10/01
Page 7 of 8
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