SQ48T15012-NBB0 POWER ONE, SQ48T15012-NBB0 Datasheet - Page 5

• Manufacturer Part Number: SQ48T15012-NBB0
• Description: CONV DC-DC 48V IN 1.2V OUT 18W
• Manufacturer: POWER ONE
• Series: SQ48r
• Type: Isolatedr

Specifications of SQ48T15012-NBB0

• Output: 1.2V
• Number Of Outputs: 1
• Power (watts): 18W
• Mounting Type: Through Hole
• Voltage - Input: 36 ~ 75V
• Package / Case: 8-DIP Module, 1/4 Brick
• 1st Output: 1.2 VDC @ 15A
• Size / Dimension: 2.30" L x 0.90" W x 0.34" H (58.4mm x 22.9mm x 8.6mm)
• Power (watts) - Rated: 18W
• Operating Temperature: -40°C ~ 85°C
• Approvals: cUL, EN, UL
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• 3rd Output: -
• 2nd Output: -
• 4th Output: -
• Other names: 179-2217; SQ48T15012-NAA0; SQ48T15012-NBBO

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 32 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 50%
of the nominal value of output voltage, the converter
will shut down (Fig. x.17).
Once the converter has shut down, it will attempt to
restart nominally every 100 ms with a typical 1-2%
duty cycle (Fig. x.18). The attempted restart will
continue indefinitely until the overload or short circuit
conditions are removed or the output voltage rises
above 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
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
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
International safety regulatory requirements per
UL60950 and EN60950. Basic Insulation is provided
between input and output.
SEP 14, 2005 revised to NOV 06, 2006
converters
converter
will
meet
shut
North
down
American
under
and
an
Page 5 of 64
36-75 VDC Input; 1.0-12 VDC Output
To comply with safety agencies’ requirements, an
input line fuse must be used external to the converter.
The Table below provides the recommended fuse
rating for use with this family of products.
All SQ converters are UL approved for a maximum
fuse rating of 15 Amps. To protect a group of
converters with a single fuse, the rating can be
increased from the recommended values 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, Information
technology
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 (see
Application Note 100), all versions of the SQ48 Series
converters pass the requirements of Class B
conducted
requirements. Please contact Power-One Applications
Engineering for details of this testing.
Characterization
General Information
The converter has been characterized for many
operational aspects, to include thermal derating
(maximum load current as a function of ambient
temperature and airflow) for vertical and horizontal
mounting,
parameters,
response to load step-change, overload, and short
circuit.
The figures are numbered as Fig. x.y, where x
indicates the different output voltages, and y
associates with specific plots (y = 1 for the vertical
thermal derating, …). For example, Fig. x.1 will refer
to the vertical thermal derating for all the output
voltages in general.
The following pages contain specific plots or
waveforms associated with the converter. Additional
comments for specific data are provided below.
SQ48 DC-DC Series Data Sheet
12 - 5.0 V, 2.5 V
Output Voltage
2.0 - 1.2 V
emissions
efficiency,
output
equipment
3.3 V
ripple
per
startup
-
and
EN55022
Fuse Rating
Radio
www.power-one.com
4 A
3 A
2 A
noise,
and
disturbance
and
shutdown
transient
FCC