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UEI30 Series
30W Isolated Wide-Range DC-DC Converters
There are two CAUTIONs for the On/Off Control:
CAUTION: While it is possible to control the On/Off with external logic if you
carefully observe the voltage levels, the preferred circuit is either an open
drain/open collector transistor or a relay (which can thereupon be controlled by
logic). The On/Off prefers to be set at approx. +15V (open pin) for the ON state,
assuming positive logic.
CAUTION: Do not apply voltages to the On/Off pin when there is no input
power voltage. Otherwise the converter may be permanently damaged.
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 Speci?cations. An external discrete ?lter is
installed and the circuit diagram is shown below.
Test Card
Resistive Load
+VCC
V+
UUT
3
Black
C16
C8
C8
L3
C8
C8
L1
C8
C8
C7
Vin+
Vout+
Resistive Load
inside a metal
ON/OFF
C17
container
1
CONTROL
-VIN
V-
Vin-
Vout-
Figure 8. Conducted Emissions Test Circuit
Figure 7. Driving the On/Off Control Pin (suggested circuit)
[1] Conducted Emissions Parts List
Reference Description
L1
L3
C8
C7
C16, C17
470μH, 10A
750μH, 6A
1μfd, 100V
100μfd, 100V
150pfd, 3kV, 2010-01183-0
[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
[3] Conducted Emissions Test Results
dBμV
80
70
60
50
40
30
20
10
0
-10
-20
CONAV
0.15
1.0
10.0
30.0
MHz
Graph 1. Conducted emissions performance with ?lter, Negative Line, CISPR 22,
Class B, full load, for UEI30-033-Q48N-C
www.murata-ps.com/support
MDC_UEI Series 30W.B01 Page 16 of 18
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