Datasheet

UWE-100-120W Series
Wide Input, Isolated Eighth-Brick DC-DC Converters
MDC_UWE-100-120W.C02 Page 33 of 34
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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 fi lter components
were employed.
[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
HP11947A Transient Limiter (Agilent)
OHMITE 25W – Resistor combinations
DC Source Programmable DC Power Supply Model 62012P-100-50[3]
Conducted Emissions Test Results (UWE-12/10-Q48)
[4] Layout Recommendations
Most applications can use the fi ltering which is already installed inside the
converter or with the addition of the recommended external capacitors. For
greater emissions suppression, consider additional fi 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.
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
Figure 10. Conducted Emissions Test Circuit
UWE EMI 120W Test Card
48Vdc in, 12Vout, 10Amps
V+
V-
Black
Vin -
Vout -
Vout +Vin +
Resistive
Load
UUT
Resistive
Load
inside a
metal
container
L1
L3
C7
C16
C17
C8C8
C8
C8C8
C8
Graph 1. Conducted emissions performance, CISPR 22, Class B, full load