V48SC datasheet(7/17 Pages) DELTA

7 / 17 page

DS_V48SC12007_04262016

1 MHz

10 MHz

150 kHz

30 MHz

10.0

20.0

30.0

40.0

50.0

60.0

70.0

0.0

80.0

dBμV

Limits

55022MQP

55022MAV

Transducer

8130

Traces

PK+

Figure 15 - EMI test

Safety Considerations

The power module must be installed in compliance with

the spacing

and

separation requirements

the

end-

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

CSA C22.2 NO. 60950-1 2nd and IEC 60950-1 2nd :

2005 and EN 60950-1 2nd: 2006+A11+A1: 2010, 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:

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 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 V48SC120XXX to meet EN55022

(VDE0878) class B (both q. peak and average)

Schematic and Components List

Figure 14 - EMI test schematic

1. C1=C2=C3=2.2uF/100V

2. C5=C6=C7=C8=10nF;

3. C4=100uF/100V.

Test Result:

At T = +25

C , Vin = 48 V and full load

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

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