HA1SV12004 Datasheet, PDF (5/11 Pages) Delta Electronics, Inc. – 50W DC/DC Power Modules

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 150μF 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. Below is the reference design for an input filter
tested with HA1SV12004PRFA to meet class A in
CISSPR 22.
Schematic and Components List
Figure 12 EMC test schematic
C121=120Uf/400V
C123,C124,C127,C132 =220pF/275VAC
C128,C129,C130,C131=2200pF/300VAC
C122,C125,C126=0.47uF/250V
T1=3.4mH, common choke
R110,R111,R112,R113,R114=300kohm/1206
Test Result:
At T = +25C , Vin = 110V and full load
black line is QP model;
Figure 13 EMI test positive line
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,
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 110 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 110 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.
 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.
DS_HA1SV12004_04082016
E-mail: [e-mail]
http://www.deltaww.com/dcdc _P5