S48SA3R310 datasheet(6/13 Pages) DELTA

6 / 13 page

DS_S48SA3R310_10112013

DESIGN CONSIDERATIONS

Input Source Impedance

The impedance of the input source connecting to the

DC/DC power modules will interact with the modules

and affect the stability. A low ac-impedance input

source is recommended. If the source inductance is

more than a few μH, we advise adding a 10 to 100 μF

electrolytic c

apacitor (ESR < 0.7 Ω at 100 kHz)

mounted close to the input of the module to improve the

stability.

Layout and EMC Considerations

Delta’s DC/DC power modules are designed to operate

in a wide variety of systems and applications. For

design assistance with EMC compliance and related

PWB layout issues, please contact Delta’s technical

support team. An external input filter module is

available

for

easier

EMC

compliance

design.

Application notes to assist designers in addressing

these issues are pending release.

Safety Considerations

The power module must be installed in compliance with

the spacing and separation requirements of the end-

user’s safety agency standard if the system in which the

power module is to be used must meet safety agency

requirements.

When the input source is 60Vdc or below, the power

module

meets

SELV

(safety

extra-low

voltage)

requirements. If the input source is a hazardous voltage

which is greater than 60 Vdc and less than or equal to

75 Vdc, for the module’s output to meet SELV

requirements, all of the following must be met:



The input source must be insulated from any

hazardous voltages, including the ac mains, with

reinforced insulation.



One Vi pin and one Vo pin are grounded, or all the

input and output pins are kept floating.



The input terminals of the module are not operator

accessible.



A SELV reliability test is conducted on the system

where the module is used to ensure that under a

single fault, hazardous voltage does not appear at

the module’s output.

Do not ground one of the input pins without grounding

one of the output pins. This connection may allow a

non-SELV voltage to appear between the output pin

and ground.

This power module is not internally fused. To achieve

optimum safety and system protection, an input line

fuse is highly recommended. The safety agencies

require a normal-blow fuse with 3A maximum rating to

be installed in the ungrounded lead. A lower rated fuse

can be used based on the maximum inrush transient

energy and maximum input current.

Soldering and Cleaning Considerations

Post solder cleaning is usually the final board assembly

process

before

the

board

system

undergoes

electrical testing. Inadequate cleaning and/or drying

may lower the reliability of a power module and

severely affect the finished circuit board assembly test.

Adequate cleaning and/or drying is especially important

for un-encapsulated and/or open frame type power

modules. For assistance on appropriate soldering and

cleaning procedures, please contact Delta’s technical

support team.

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