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NV Series Data Sheet
6 W SMT DC-DC Converters, 3.3 – 48 V Output
Output Current Limitation
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).
Safety
These converters are tested with 1500 VDC from input
to output. The input-to-output resistance is greater
than 10 M ? . These converters are provided with Basic
Insulation between input and output. 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.
In order to consider the output of the converter as
SELV (Safety Extra Low Voltage) or TNV-1, according
to IEC/EN 60950-1 and UL/CSA 60950-1, one of the
following requirements must be met in the system
design:
? Fuse: The converter has no internal fuse. An
external fuse must be provided to protect the
system from catastrophic failure. Recommended
fuses are listed in the table below:
Series Operation
The outputs of two units may be connected in series
to achieve a higher system voltage.
Input Voltage Range
36 – 75V
18 – 36V
9 – -6V
18 – -5V
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,
TNV-1, or TNV-2, 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.
BCD.00014 Rev. AA, 30-June-2010
Page 7 of 11
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