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.

January 28, 2013

12

SANKEN ELECTRIC CO., LTD.

LC5540LF-DS

Single-Stage Power Factor Corrected

Off-Line Switching Regulator ICs

LC5540LF

Series