ULS-12/2.5-D48N-C【PDF 29/30 页】36-75VIN 12VOUT 30W NEG LOGIC

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ULS 30-Watt Series

Sixteenth-brick DOSA-Compatible,

Isolated DC/DC Converters

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.

[4] Conducted Emissions Test Results

Test Card

C4

Resistive Load

DC Source V+

L2

UUT

Resistive Load

Black

C1

L1

C2

C3

Vin+

Vout+

C6

inside a metal

container

Graph 1. ULS-3.3/8-D48N-C conducted emissions performance, Peak Detection Mode,

V-

Vin-

Vout-

CISPR/EN55022, Class B, full load at 48Vin

C5

Figure 9. Conducted Emissions Test Circuit

[1] Conducted Emissions Parts List

Reference

L1

L2

Part Number

PE-62913

NC

Description

1mH, 6A

4.7uH, 3.6A

Vendor

Pulse

Murata

Ceramic Capacitor

C1, C2

VZ Series

(3.2uf) = 2.2ufd/1ufd in

Panasonic

parallel, 100V

C3

C4, C5

C6

VZ Series

Unknown

VZ Series

Qty 2 - Electrolytic Capacitor

22ufd, 100V

3.3nF, 1500V

Electrolytic Capacitor 33ufd,

100V

Panasonic

Unknown

Panasonic

Graph 2. ULS-12/2.5-D48N-C conducted emissions performance, Peak Detection Mode,

[2] Conducted Emissions Test Equipment Used

CISPR/EN55022, Class B, full load at 48Vin

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] 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 GEAN-02 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.

Graph 3. ULS-15/2-D48P-C conducted emissions performance, Peak Detection Mode,

CISPR/EN55022, Class B, full load at 48Vin

www.murata-ps.com/support

MDC_ULS-30W_C06 Page 29 of 30

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