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UWE-100-120W Series
Wide Input, Isolated Eighth-Brick DC-DC Converters
Emissions Performance
The sample was tested in accordance with CISPR/EN55022 requirements.
Class B limits were applied for this test. The EUT was supplied with 48Vdc
(nominal) and was loaded to the maximum rating 120 Watts. The noise was
measured on the return side of supply. The following EMI ?lter components
were employed.
Conducted Emissions Test Results (UWE-12/10-Q48)
UWE EMI 120W Test Card
48Vdc in, 12Vout, 10Amps
Resistive
Load
UUT
V+
Resistive
Black
C16
C8
C8
C8
C8
C8
C8
C7
Vin +
Vout +
Load
V-
C17
L3
L1
Vin -
Vout -
inside a
metal
container
Figure 10. Conducted Emissions Test Circuit
[1] Conducted Emissions Parts List
Graph 1. Conducted emissions performance, CISPR 22, Class B, full load
REFERENCE PART NUMBER DESCRIPTION VENDOR
L1 PE-62913 1mH, 6A Pulse
L3 500μh,10A, MPS 500μh,10A Murata
C1, C2, C8 2.2μFd Murata
C7 VZ Series Qty 2 - Electrolytic Capacitor 22μFd, 100V Panasonic
C16, C17 .22μFd Unknown
[2] Conducted Emissions Test Equipment Used
Rohde & Schwarz EMI Test Receiver (9KHz – 1000MHz) ESPC
Rohde & Schwarz Software ESPC-1 Ver. 2.20
HP11947A Transient Limiter (Agilent)
OHMITE 25W – Resistor combinations
DC Source Programmable DC Power Supply Model 62012P-100-50[3]
[4] Layout Recommendations
Most applications can use the ?ltering which is already installed inside the
converter or with the addition of the recommended external capacitors. For
greater emissions suppression, consider additional ?lter components and/or
shielding. Emissions performance will depend on the user’s PC board layout,
the chassis shielding environment and choice of external components. Please
refer to Application Note GEAN02 for further discussion.
Since many factors affect both the amplitude and spectra of emissions, we
recommend using an engineer who is experienced at emissions suppression.
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MDC_UWE-100-120W.B07 Page 26 of 27
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