DS_V48SR15004_06122007
6
EMC Test Result
Test result is in compliance with EN55022 class B as
shown below.
Average mode, @ Vin = 48V, Iout=4.4A
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
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 example of using Delta
latest FL75L07 7A surface mountable input filter tested
with V48SR15004 to meet class B compliance.
Schematic and Components
Filter = Delta EMI Filter, FL75L07;
L1 = 1uH differential inductor;
CX = 100uF/100V low impedance electrolytic capacitance;
CY1 = 0.22uF low impedance SMT ceramic capacitance.
Suggested Layout
