Datasheet
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
MDC_BEI15W.A18 Page 15 of 15
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Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifi cations are subject to change without
notice. © 2016 Murata Power Solutions, Inc.
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfi eld, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
Emissions Performance
Murata Power Solutions measures its products for radio frequency emissions
against the EN 55022 and CISPR 22 standards. Passive resistance loads are
employed and the output is set to the maximum voltage. If you set up your
own emissions testing, make sure the output load is rated at continuous power
while doing the tests.
The recommended external input and output capacitors (if required) are
included. Please refer to the fundamental switching frequency. All of this
information is listed in the Product Specifi cations. An external discrete fi lter is
installed and the circuit diagram is shown below.
[1] Conducted Emissions Parts List
[2] Conducted Emissions Test Equipment Used
Rohde & Schwarz EMI Test Receiver (9KHz – 1000MHz) ESPC
Rohde & Schwarz Software ESPC-1 Ver. 2.20
OHMITE 25W – 1 Ohm resistor combinations
DC Source Programmable DC Power Supply Model 62012P-100-50
Reference Description
L1 1mH, 6A
L3 500μH,10A
C1, C2, C8 2.2μfd
C7 Electrolytic Capacitor 100μfd, 100V
C16, C17 .22μfd
C3, C4 Electrolytic Capacitor 33μfd, 100V
Figure 4. Conducted Emissions Test Circuit
Test Card
UUT
V+
V-
Vin-
Vout-
Vin+
Resistive Load
inside a metal
container
Resistive Load
inside a metal
container
Vout+
Gnd
Black
C16 C8 C8 C8 C8C8 C8 C7
C3
C4
C17
L3 L1
Resistive Load
Graph 1. Conducted emissions performance with fi lter, CISPR 22, Class B, full load,
for BEI15-150-Q12P-C
Graph 2. Conducted emissions performance without fi lter, CISPR 22, Class B, full
load, for BEI15-150-Q12P-C
[3] Conducted Emissions Test Results