Q24T25025 DC-DC Converter Data Sheet
18-36 VDC Input; 2.5 VDC @ 25A Output
Protection Features
Safety Requirements
Input Undervoltage Lockout
The converters meet North American and International
safety regulatory requirements per UL60950 and EN60950.
Basic Insulation is provided between input and output.
Input undervoltage lockout is standard with this converter.
The converter will shut down when the input voltage drops
below a pre-determined voltage.
To comply with safety agencies requirements, an input line
fuse must be used external to the converter. A 7-A fuse is
recommended for use with this product.
The input voltage must be at least 17.5 V for the converter to
turn on. Once the converter has been turned on, it will shut
off when the input voltage drops below 15 V. This feature is
beneficial in preventing deep discharging of batteries used in
telecom applications.
Electromagnetic Compatibility (EMC)
EMC requirements must be met at the end-product system
level, as no specific standards dedicated to EMC character-
istics 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, Information technology equipment - Radio distur-
bance characteristics - Limits and methods of measurement.
Output Overcurrent Protection (OCP)
The converter is protected against overcurrent or short cir-
cuit 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 1 Vdc, the converter will shut down (Fig.
26).
With the addition of a simple external filter (see application
notes), all versions of the Q24T25 converters pass the re-
quirements of Class B conducted emissions per EN55022
and FCC, and meet at a minimum, Class A radiated emis-
sions per EN 55022 and Class B per FCC Title 47CFR, Part
15-J. Please contact Power-One Applications Engineering
for details of this testing.
Once the converter has shut down, it will attempt to restart
nominally every 100 ms with a 3% duty cycle (Fig 27). The
attempted restart will continue indefinitely until the overload
or short circuit conditions are removed or the output voltage
rises above 1 Vdc.
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 refer-
ence, 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 con-
dition to protect itself from overheating caused by operation
outside the thermal derating curves, or operation in abnor-
mal conditions such as system fan failure. After the con-
verter has cooled to a safe operating temperature, it will
automatically restart.
JUN 01, 2003 revised to NOV 22, 2006
Page 7 of 14
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