NVD0.7EGG-M6 데이터 시트보기 (PDF) - Power-One Inc.
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NVD0.7EGG-M6 Datasheet PDF : 11 Pages
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NV DC-DC Series Data Sheet
6W SMT Converter • Wide Input • 3.3V to +/-24V Outputs
Output Current Limiting
When the output is overloaded above the maximum
output current rating, the voltage will start to reduce
to maintain the output power to a safe level. In a
condition of high overload or short-circuit where the
output voltage is pulled below approximately 30% of
Vo.nom, the unit will enter a ‘Hiccup’ mode of
operation. Under this condition the unit will attempt
to restart, approximately every 100 ms until the
overload has cleared.
Parallel Operation
Paralleling of two converters is possible by direct
connection of the output voltage terminal pins. The
load regulation characteristic is designed to facilitate
current sharing (typically ± 20%).
However, this may cause start-up problems at initial
start-up, and is only recommended in applications
where one converter is able to deliver the full load
current (true redundant systems).
Series Operation
The outputs of two units may be connected in series
to achieve a higher system voltage.
Safety Considerations
These converters feature 1500 VDC isolation from
input to output. The input-to-output resistance is
greater than 10MΩ. These converters are provided
with Basic Insulation between input and output
circuits according to EN60950 / UL1950 /
CSA60950-00. Nevertheless, if the system using
the converter needs to receive safety agency
approval, certain rules must be followed in the design
of the system. In particular, all of the creepage and
clearance requirements of the end-use safety
requirements must be observed. These documents
include UL60950, CSA60950-00 and EN60950,
although specific applications may have additional
requirements.
In order for the output of the converter to be
considered as SELV (Safety Extra Low Voltage) or
TNV-1, according to EN60950 / UL1950 /
CSA60950-00, one of the following requirements
must be met in the system design:
• The converter has no internal fuse. An external
fuse must be provided to protect the system from
catastrophic failure. The recommended fuse
values are shown below:
Input Voltage Range
36-75V
18-36V
9-36V
18-75V
Recommended Fuse
F0.315A
F0.5A
F1.0A
F0.5A
• The user can select a lower rating fuse based
upon the inrush transient and the maximum input
current of the converter, which occurs at the
minimum input voltage. Both input traces and the
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.
• If the voltage source feeding the module is SELV,
the output of the converter is considered SELV
and may be grounded or ungrounded.
• The circuitry of the converter may generate
transients, which exceed the input voltage. Even
if the input voltage is SELV (<60V) the
components on the primary side of the converter
may have to be considered as hazardous. A
safety interlock may be needed to prevent the
user from accessing the converter while
operational.
APR 20, 2006 revised to MAR 12, 2007
Page 6 of 11
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