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STR-X6759N Datasheet(PDF) 9 Page - Allegro MicroSystems

Part # STR-X6759N
Description  Off-Line Quasi-Resonant Switching Regulators
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

STR-X6759N Datasheet(HTML) 9 Page - Allegro MicroSystems

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Off-Line Quasi-Resonant Switching Regulators
— These devices are designed to be operated at lethal voltages and energy levels. Circuit
designs that embody these components must conform with applicable safety requirements. Precau-
tions must be taken to prevent accidental contact with power-line potentials.
The use of an isolation transformer is recommended during circuit development and breadboarding.
Because reliability can be affected adversely by improper storage
environments and handling methods, please observe the following
Cautions for Storage
Ensure that storage conditions comply with the standard
temperature (5°C to 35°C) and the standard relative humidity
(around 40 to 75%); avoid storage locations that experience
extreme changes in temperature or humidity.
Avoid locations where dust or harmful gases are present and
avoid direct sunlight.
Reinspect for rust on leads and solderability of products that have
been stored for a long time.
Cautions for Testing and Handling
When tests are carried out during inspection testing and other
standard test periods, protect the products from power surges
from the testing device, shorts between adjacent products, and
shorts to the heatsink.
Remarks About Using Silicone Grease with a Heatsink
When silicone grease is used in mounting this product on a
heatsink, it shall be applied evenly and thinly. If more silicone
grease than required is applied, it may produce stress.
Coat the back surface of the product and both surfaces of the
insulating plate to improve heat transfer between the product and
the heatsink.
Volatile-type silicone greases may permeate the product and
produce cracks after long periods of time, resulting in reduced
heat radiation effect, and possibly shortening the lifetime of the
Our recommended silicone greases for heat radiation purposes,
which will not cause any adverse effect on the product life, are
indicated below:
Shin-Etsu Chemical Co., Ltd.
Momentive Performance Materials
Dow Corning Toray Silicone Co., Ltd.
Heatsink Mounting Method
Torque When Tightening Mounting Screws. Thermal resistance
increases when tightening torque is low, and radiation effects are
decreased. When the torque is too high, the screw can strip, the heatsink
can be deformed, and distortion can arise in the product frame. To avoid
these problems, observe the recommended tightening torques for this
product package type, TO-3P: 0.588 to 0.785 N•m (6 to 8 kgf•cm).
For effective heat transfer, the contact area between the product and
the heatsink should be free from burrs and metal fragments, and the
heatsink should be flat and large enough to contact over the entire side
of the product, including mounting flange and exposed thermal pad,
and have a minimal mounting hole to prevent possible deflection and
cracking of the product case when fastened to the heatsink.
When soldering the products, please be sure to minimize the
working time, within the following limits:
260±5°C 10 s
3 s
Soldering iron should be at a distance of at least 1.5 mm from the
body of the products
Electrostatic Discharge
When handling the products, operator must be grounded.
Grounded wrist straps worn should have at least 1 MΩ of
resistance to ground to prevent shock hazard.
Workbenches where the products are handled should be
grounded and be provided with conductive table and floor mats.
When using measuring equipment such as a curve tracer, the
equipment should be grounded.
When soldering the products, the head of soldering irons or the
solder bath must be grounded in other to prevent leak voltages
generated by them from being applied to the products.
The products should always be stored and transported in our
shipping containers or conductive containers, or be wrapped in
aluminum foil.
Recommended operation temperature
• Inner frame temperature in operation TF = 115°C
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com

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