cui.com

date 05/20/2016

│ page 11 of 13

CUI Inc

│ SERIES: PRD25 │ DESCRIPTION: DC-DC CONVERTER

TEST CONFIGURATIONS

Input Ripple Current & Output Noise

AllmodelsaretestedandspecifiedforinputreflectedripplecurrentandoutputnoiseasperlayoutsshowninFigures1&

2.TheCbusandLbuscomponentssimulateatypicalDCvoltagebus.However,yourspecificsystemconfigurationmay

require additional considerations.

Figure 1 Measuring Input Ripple Current

Table 1

C

IN

33µF,ESR<700mΩ@100kHz

C

BUS

220µF,ESR<100mΩ@100kHz

L

BUS

12µH

CIN

VIN

CBUS

LBUS

1

2

+VIN

−VIN

CURRENT

PROBE

TO

OSCILLOSCOPE

+

–

+

–

Figure 2 Measuring Output Ripple and noise

(PARD)

Table 2

C1

1µF

C2

10µF

load 2-3 inches (51-76mm) from module

C1

C2

SCOPE

+VOUT

−VOUT

EMC RECOMMENDED CIRCUIT

DC Source

UUT

V+

V-

Vin-Vout-

Vin+

Resistive Load

inside a metal

container

Vout+

Black

C1

L1

C2

L2

6

C

3

C

C4

C5

Resistive Load

RecommendedExternalCircuitComponents

L1

1 mH, 6 A

L2

4.7 µH, 3.6 A

C1, C2

ElectrolyticCapacitor22µfd,100V

C3

Qty.2-ElectrolyticCapacitor22µfd,100V

C4, C5

3.3nF,1500V

C6

ElectrolyticCapacitor22µfd,100V

Table 3

Figure 3 Conducted Emissions Test Circuit

For more information, please visit the product page.