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6
3.4 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.
3.5 SAFETY REQUIREMENTS
The converters meet the requirements of the latest edition and amendment of ITE Safety standards UL/CSA 60950-1.
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. The table below provides the recommended fuse rating for use with this family of products.
If one input fuse is used for a group of modules, the maximum fuse rating should not exceed 15-A (SQ modules are UL approved with
up to a 15-A fuse).
3.6 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, Bel Power Solutions 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 SQ24 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 di/dt Applications Engineering for details of this testing.
4. CHARACTERIZATION
4.1 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, efficiency, start-up and shutdown parameters, output ripple and
noise, transient 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 is associated with a specific plot (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.
4.2 TEST CONDITIONS
All data presented were taken with the converter soldered to a test board, specifically a 0.060” thick printed wiring board (PWB) with
four layers. The top and bottom layers were not metalized. The two inner layers, comprising two-ounce copper, were used to provide
traces for connectivity to the converter.
The lack of metalization on the outer layers as well as the limited thermal connection ensured that heat transfer from the converter to the
PWB was minimized. This provides a worst-case but consistent scenario for thermal derating purposes.
All measurements requiring airflow were made in vertical and horizontal wind tunnel facilities using Infrared (IR) thermography and
thermocouples for thermometry.
Ensuring components on the converter do not exceed their ratings is important to maintaining high reliability. If one anticipates operating
the converter at or close to the maximum loads specified in the derating curves, it is prudent to check actual operating temperatures in
the application. Thermographic imaging is preferable; if this capability is not available, then thermocouples may be used. Bel Power
Solutions recommends the use of AWG #40 gauge thermocouples to ensure measurement accuracy. Careful routing of the thermocouple
leads will further minimize measurement error. Refer to Figure H for optimum measuring thermocouple location.