E48SP datasheet(7/15 Pages) DELTA

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DS_E48SP12020_08022010

Safety Considerations

The power module must be installed in compliance with

the spacing and separation requirements of the

end-user’s safety agency standard, i.e., UL60950-1,

CAN/CSA-C22.2, No. 60950-1 and EN60950-1+A11 and

IEC60950-1, if the system in which the power module is

to be used must meet safety agency requirements.

Basic insulation based on 75 Vdc input is provided

between the input and output of the module for the

purpose of applying insulation requirements when the

input to this DC-to-DC converter is identified as TNV-2

or SELV.

An additional evaluation is needed if the

source is other than TNV-2 or SELV.

When the input source is SELV circuit, 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 the ac

mains by reinforced or double insulation.

The input terminals of the module are not operator

accessible.

If the metal baseplate / heatspreader is grounded

the output must be also grounded.

A SELV reliability test is conducted on the system

where the module is used, in combination with the

module, to ensure that under a single fault,

hazardous voltage does not appear at the module’s

output.

When installed into a Class II equipment (without

grounding), spacing consideration should be given to

the end-use installation, as the spacing between the

module and mounting surface have not been evaluated.

The power module has extra-low voltage (ELV) outputs

when all inputs are ELV.

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

Fast-acting fuse with 30A 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 or 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.

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 33 to 100 µF electrolytic

capacitor (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. Below is the reference design for an

input filter tested with E48SP12020XXXX to meet class B

in CISSPR 22.

Schematic and Components List

E48SP12020

Vin(-)

Vo(-)

Vin

CY1

CY2

Cin

Vo(+)

Vin(+)

LOAD

Cin is 100uF*2 low ESR Aluminum cap;

CX is 2.2uF ceramic cap;

CY1 are 10nF ceramic caps;

CY2 are 10nF ceramic caps;

CY is 1nF ceramic cap;

L1 is common-mode inductor, L1=0.53mH;

Test Result:

Vin=48V, Io=20A,

Yellow line is quasi peak mode; Blue line is average mode.

E48SP Datasheet(PDF) 7 Page - Delta Electronics, Inc.

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