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SANKEN ELECTRIC CO., LTD.

Off-Line Quasi-Resonant Switching Regulators

STR-X6729

STRX6729DS

Because reliability can be affected adversely by improper

storage environments and handling methods, please observe

the following cautions.

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 the

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

the product pins, and wrong connections. Ensure all test

parameters are within the ratings specified by Sanken for

the products.

Remarks About Using Silicone Grease with a Heatsink

•

When silicone grease is used in mounting the products on

a heatsink, it shall be applied evenly and thinly. If more

silicone grease than required is applied, it may produce

excess stress.

•

Volatile-type silicone greases may crack after long periods

of time, resulting in reduced heat radiation effect. Silicone

greases with low consistency (hard grease) may cause

cracks in the mold resin when screwing the products to a

heatsink.

Our recommended silicone greases for heat radiation

purposes, which will not cause any adverse effect on the

product life, are indicated below:

Type

Suppliers

G746

Shin-Etsu Chemical Co., Ltd.

YG6260

Momentive Performance Materials Inc.

SC102

Dow Corning Toray Co., Ltd.

Cautions for Mounting to a Heatsink

•

When the flatness around the screw hole is insufficient, such

as when mounting the products to a heatsink that has an

extruded (burred) screw hole, the products can be damaged,

even with a lower than recommended screw torque. For

mounting the products, the mounting surface flatness should

be 0.05 mm or less.

•

Please select suitable screws for the product shape. Do not

use a flat-head machine screw because of the stress to the

products. Self-tapping screws are not recommended. When

using self-tapping screws, the screw may enter the hole

diagonally, not vertically, depending on the conditions of hole

before threading or the work situation. That may stress the

products and may cause failures.

•

Recommended screw torque: 0.588 to 0.785 N●m (6 to 8

kgf●cm).

•

For tightening screws, if a tightening tool (such as a driver)

hits the products, the package may crack, and internal

stress fractures may occur, which shorten the lifetime of

the electrical elements and can cause catastrophic failure.

Tightening with an air driver makes a substantial impact.

In addition, a screw torque higher than the set torque can

be applied and the package may be damaged. Therefore, an

electric driver is recommended.

When the package is tightened at two or more places, first

pre-tighten with a lower torque at all places, then tighten

with the specified torque. When using a power driver, torque

control is mandatory.

Soldering

•

When soldering the products, please be sure to minimize

the working time, within the following limits:

260±5°C

10±1 s

(Flow, 2 times)

380±10°C 3.5±0.5 s (Soldering iron, 1 time)

•

Soldering should be at a distance of at least 2.0 mm from

the body of the products.

Electrostatic Discharge

•

When handling the products, the operator must be

grounded. Grounded wrist straps worn should have at

least 1 MΩ of resistance from the operator to ground to

prevent shock hazard, and it should be placed near the

operator.

•

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 order to prevent

leak voltages generated by them from being applied to the

products.

•

The products should always be stored and transported in

Sanken shipping containers or conductive containers, or

be wrapped in aluminum foil.