Q48SK12448NNFB Datasheet, PDF (7/10 Pages) Delta Electronics, Inc. – 600W DC/DC Power Modules

DESIGN CONSIDERATIONS
Input Source Impedance
The impedance of the input source connecting to the
DC/DC power modules will interact with the modules
and affect the stability. A low ac-impedance input source
is recommended. If the source inductance is more than
a few μH, we advise 100μF electrolytic capacitor (ESR <
0.7 Ω at 100 kHz) mounted close to the input of the
module to improve the stability.
Layout and EMC Considerations
Delta’s DC/DC power modules are designed to operate
in a wide variety of systems and applications. For
design assistance with EMC compliance and related
PWB layout issues, please contact Delta’s technical
support team. An external input filter module is available
for easier EMC compliance design. Application notes
to assist designers in addressing these issues are
pending release.
Safety Considerations
This power module is not internally fused. To achieve
optimum safety and system protection, an input line
fuse is highly recommended. The safety agencies
require a normal-blow fuse with 60A maximum rating to
be installed in the ungrounded lead. A lower rated fuse
can be used based on the maximum inrush transient
energy and maximum input current.
Soldering and Cleaning Considerations
Post solder cleaning is usually the final board assembly
process before the board or system undergoes electrical
testing. Inadequate cleaning and/or drying may lower the
reliability of a power module and severely affect the
finished circuit board assembly test. Adequate cleaning
and/or drying is especially important for un-encapsulated
and/or open frame type power modules. For assistance
on appropriate soldering and cleaning procedures,
please contact Delta’s technical support team.
FEATURES DESCRIPTIONS
Over-Current Protection
The modules include an internal output over-current
protection circuit. If the output current exceeds the OCP
set point, the modules will shut down (hiccup mode).The
hiccup time will last 2s. The modules will try to restart
after shutdown. If the overload condition still exists, the
module will shut down again. This restart trial will
continue until the overload condition is corrected.
Over-Voltage Protection
The modules include an internal output over-voltage
protection circuit, which monitors the voltage on the
output terminals. If this voltage exceeds the
over-voltage set point the module will shut down (latch
mode) and keep not restart again until module restart up
by input voltage.
If hiccup mode is needed for OVP, please contact with
Delta.
Over-Temperature Protection
The over-temperature protection consists of circuitry
that provides protection from thermal damage. If the
temperature exceeds the over-temperature threshold
the module will shut down. The module will restart after
2s .
Remote On/Off
The remote on/off feature on the module is negative
logic. Negative logic turns the module on during a logic
low and off during a logic high. If the remote on/off
feature is not used, please short the on/off pin to Vi (-).
Remote on/off can be controlled by an external switch
between the on/off terminal and the Vi (-) terminal. The
switch can be an open collector or open drain.
DS_Q48SK12448NNFB_10222015
Figure 16: Remote on/off implementation
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