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SQE48T40025 DC-DC Converter Data Sheet
36-75 VDC Input; 2.5 VDC @ 40A Output
Protection Features
Input Undervoltage Lockout
Input undervoltage lockout is standard with this
converter. The converter will shut down when the
input voltage drops below a pre-determined voltage.
The input voltage must be typically 34 V for the
converter to turn on. Once the converter has been
turned on, it will shut off when the input voltage
drops typically below 33 V. This feature is beneficial
in preventing deep discharging of batteries used in
telecom applications.
Output Overcurrent Protection (OCP)
The converter is protected against overcurrent or
short circuit conditions. Upon sensing an overcurrent
condition, the converter will switch to constant
current operation and thereby begin to reduce output
voltage.
If the converter is equipped with the special OCP
version designated by the suffix K in the part
such as system fan failure. Converter with the non-
latching option will automatically restart after it has
cooled to a safe operating temperature.
Safety Requirements
The converters meet North American and
International safety regulatory requirements per
UL60950 and EN60950. Basic Insulation is provided
between input and output.
The converters have no internal fuse. If required, the
external fuse needs to be provided to protect the
converter from catastrophic failure. Refer to the
“Input Fuse Selection for DC/DC converters”
application note on www.power-one-com for proper
selection of the input fuse. 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.
Abnormal and component failure tests were
conducted with the input protected by a TBD fuse. If
a fuse rated greater than TBD A is used, additional
number, the converter will shut down in
testing may be required.
To protect a group of
approximately 15ms after entering the constant
current mode of operation. The standard version
(suffix 0) will continue operating in the constant
current mode until the output voltage drops below
60% at which point the converter will shut down as
shown in Figure 14.
Once the converter has shut down, it will attempt to
restart nominally every 200 ms with a typical 3-5%
duty cycle as shown in Figure 15. The attempted
restart will continue indefinitely until the overload or
converters with a single fuse, the rating can be
increased from the recommended value above.
Electromagnetic Compatibility (EMC)
EMC requirements must be met at the end-product
system level, as no specific standards dedicated to
EMC characteristics of board mounted component
DC-DC converters exist. However, Power-One tests
its converters to several system level standards,
primary of which is the more stringent EN55022,
short circuit conditions are removed or the output
Information technology
equipment
-
Radio
voltage rises above 40-50% of its nominal value.
Once the output current is brought back into its
specified range, the converter automatically exits the
hiccup mode and continues normal operation.
Output Overvoltage Protection (OVP)
The converter will shut down if the output voltage
across Vout(+) (Pin 8) and Vout(-) (Pin 4) exceeds
disturbance characteristics-Limits and methods of
measurement.
An effective internal LC differential filter significantly
reduces input reflected ripple current, and improves
EMC.
With the addition of a simple external filter, the
SQE48T40025 converter passes the requirements of
Class B conducted emissions per EN55022 and FCC
the threshold of the OVP circuitry. The OVP circuitry
requirements.
Contact
Power-One
Applications
contains its own reference, independent of the output
voltage regulation loop. Once the converter has shut
down, it will attempt to restart every 200 ms until the
OVP condition is removed.
Overtemperature Protection (OTP)
The converter will shut down under an
overtemperature condition to protect itself from
overheating caused by operation outside the thermal
derating curves, or operation in abnormal conditions
Engineering for details of this testing.
ZD-01723 Rev 1.2, 04-Jan-10
www.power-one.com
Page 7 of 13
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