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参数资料
| 型号： | SQL48T20033-NDABG |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, ONE-EIGHTH BRICK PACKAGE-8 |
| 文件页数： | 11/14页 |
| 文件大小： | 773K |
| 代理商： | SQL48T20033-NDABG |
Rev 0.2, 3-Mar-11
www.power-one.com
Page 6 of 14
SQL48T20033 DC-DC Converter
36-75 VDC Input; 3.3 VDC @ 20A Output
Preliminary Data Sheet
Fig. D: Configuration for decreasing output voltage
.
Trimming/sensing beyond 110% of the rated output
voltage is not an acceptable design practice, as this
condition could cause unwanted triggering of the
output overvoltage protection (OVP) circuit. The
designer should ensure that the difference between
the voltages across the converters output pins and
its sense pins does not exceed 10% of VOUT(nom),
or:
[VOUT(+) – VOUT(-)] – [VSENSE(+) – VSENSE(-)] < VO–NOM X 10%
[V]
This equation is applicable for any condition of
output sensing and/or output trim.
Protection Features
Input Undervoltage Lockout (UVLO)
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 34V for the
converter to turn on. Once the converter has been
turned on, it will shut off when the input voltage
drops typically below 32V. This feature is beneficial
in preventing deep discharging of batteries used in
telecom applications.
Output Protections
All output circuit protection features are non-latching
and operate in a “hiccup” mode. After an output
protection event occurs, the converter will be turned
off, and held off for approximately 200 ms after
which, the protection circuit will reset and the
converter will attempt to restart. If the fault is still
present, the converter will repeat the above action.
Once the fault is removed, the converter will start
normally.
Output Overcurrent Protection (OCP)
The converter is protected against overcurrent or
short circuit conditions. Upon sensing an overcurrent
condition, the converter will shut down.
Once this occurs, it will enter hiccup mode and
attempt to restart approximately every 200 ms with
an approximate duty cycle of 9% for overcurrent and
3% for short circuit. The attempted restart will
continue indefinitely until the overload or short circuit
condition is removed.
Once the output current is brought back into its
specified range, the converter automatically exits the
hiccup mode and resumes normal operation
Output Overvoltage Protection (OVP)
The converter will shut down if the output voltage
across Vout(+) and Vout(-) 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 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
such as system
fan failure.
The converter
will
automatically restart after it has cooled to a safe
operating temperature.
Safety Requirements
The converters are safety approved to UL/CSA60950-
1, EN60950-1, and IEC60950-1. Basic Insulation is
provided between input and output.
The converters have no internal fuse. 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.
The SQL converter is UL approved for a maximum
fuse rating of 15A.
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.
An effective internal LC differential filter significantly
reduces input reflected ripple current, and improves
EMC.
With the addition of a simple external filter, the
SQL48T20033 converter will pass the requirements of
Class B conducted emissions per EN55022 and FCC
requirements. Refer to Figures 17
– 18 for typical
performance with external filter.
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