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QM48T/S25050 DC-DC Converter Data Sheet
36-75 VDC Input; 5 VDC @ 25 A Quarter-Brick
To comply with safety agencies’ requirements, an input
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 at least 35 V for the converter to
turn on. Once the converter has been turned on, it will shut
off when the input voltage drops below 31 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. When the output
voltage drops below 60% of the nominal value of output
voltage, the converter will shut down.
Once the converter has shut down, it will attempt to restart
nominally every 100 ms with a typical 3% duty cycle. The
attempted restart will continue indefinitely until the
overload or short circuit conditions are removed or the
output voltage rises above 60% of its nominal value.
Output Overvoltage Protection (OVP)
The converter will shut down if the output voltage across
Vout(+) (Pin 8) and Vout(-) (Pin 4) exceeds the threshold
of the OVP circuitry. The OVP circuitry contains its own
reference, independent of the output voltage regulation
loop. Once the converter has shut down, it will attempt to
restart every 100 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 such as system fan failure. After
the converter has cooled to a safe operating temperature,
it will automatically restart.
Safety Requirements
The converters meet North American and International
safety regulatory requirements per UL60950 and
EN60950. Basic Insulation is provided between input and
output.
line fuse must be used external to the converter. A fuse
with rating of 7A is recommended for use with this product.
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 their
converters to several system level standards, primary of
which is the more stringent EN55022, Information
technology equipment - Radio disturbance characteristics -
Limits and methods of measurement.
Effective internal LC differential filter significantly reduces
input reflected ripple current, and improves EMC.
With the addition of a simple external filter, all versions of
the QM Series of converters pass the requirements of
Class B conducted emissions per EN55022 and FCC, and
meet at a minimum, Class A radiated emissions per EN
55022 and Class B per FCC Title 47CFR, Part 15-J.
Please contact Power-One Applications Engineering for
details of this testing.
Fig. H: Location of the thermocouple for thermal testing.
MAR 27, 2003 revised to SEP 28, 2006
Page 5 of 13
www.power-one.com
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