Q2D25ZGE-N8C2
| Model | Q2D25ZGE-N8C2 |
| Description | DC-DC Regulated Power Supply Module, 2 Output, Hybrid |
| PDF file | Total 14 pages (File size: 248K) |
| Chip Manufacturer | BEL |
Q2D Series – Quarter-Brick DC/DC Converter
48V Input
Dual Output
Output Over-Current Protection (OCP)
The converter is protected against over-current or
short circuit conditions on both outputs. Upon
sensing an over-current condition, the converter
will switch to constant current operation and
thereby begin to reduce output voltages. If, due
to current limit, t e output voltage Vout1 (3.3V)
h
drops, than Vout2 (5.0V) will follow Vout1 with
less than 1 difference. Drop on Vout2 output
V
due to current limit will not affect voltage on
Vout1. For further load increase, if either Vout1
drops below 1 Vdc or Vout2 d
rops below 2 Vdc,
the converter will shut down.
Once the converter has shut down, it will attempt
to restart nominally every 100ms with a 2% duty
cycle. The attempted restart will continue
indefinitely until the overload or short circuit
conditions are removed or the output voltage
Vout1 rises above 1 Vdc and Vout2 above 2 Vdc.
Output Over-Voltage Protection (OVP)
The converter will shut down if the output voltage
across either Vout1(+) (Pin 4) or Vout2(+) (Pin 7)
and RETURN (Pin 5) exceeds the threshold of the
OVP circuitry. The OVP protection is separate for
Vout1 and Vout2 with their own reference
independent of the output voltage regulation
loops. Once the converter has shut down, it will
attempt to restart every 100ms until the OVP
condition is removed.
Over-Temperature Protection (OTP)
The converter will shut down under an over-
temperature condition to protect itself from
overheating caused by operation outside the
thermal derating curves, or operation in abnormal
conditions such as system fan failure.
The over-temperature protection circuit turns the
converter off when the temperature at a sensed
location reaches 120°C (typical). Once the
converter has shut down, it will restart when the
temperature at the sensed location falls below
110°C.
Safety Requirements
The converters meet North American and
International safety regulatory requirements per
Rev. NOV 13, 2002
Data Sheet
UL60950 and EN60950. Basic Insulation is
provided between input and output.
To comply with safety agencies requirements, an
input line fuse must be used external to the
converter. A 5-A fuse 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 its 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.
With the addition of a simple external filter (see
application notes), all versions of the Q2D family
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 testing details.
Thermal Considerations
The Q2D series converters are designed for
natural or forced convection cooling.
The
maximum available output power of the
converters is determined by the maximum
semiconductor junction temperature. To provide
reliable long-term operation of the converters,
Power-One limits maximum allowable junction
temperature to 120°C.
The graphs in Figures 14-20 show the maximum
output current of the Q2D series converters at
different local ambient temperatures at both
natural and forced (longitudinal airflow direction,
from pin 3 to pin 4) convection.
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