cui.com

date 07/12/2016

│ page 7 of 9

CUI Inc

│ SERIES: PDQ30-D │ DESCRIPTION: DC-DC CONVERTER

TEST CONFIGURATIONS

Input Ripple Current & Output Noise

Figure 1 Measuring Input Ripple Current

Table 1

L1

12 µH

C1

220 µF ESR < 0.1 Ω at 100 kHz

Cin

33 µF ESR < 0.7 Ω at 100 kHz

C1

Cin

L1

To Oscilloscope

+Vin

-Vin

+Vo

-Vo

R-Load

Vin

+

-

Figure 2 Measuring Output Ripple And Noise

Table 2

C1

10 µF tantalum capacitor

C2

1 µF ceramic capacitor

EMC RECOMMENDED CIRCUIT

Table 3

Figure 3 Conducted Emissions Test Circuit

EN55022 Class A

Recommended External Circuit

Components

Input

Voltage

(Vdc)

C1

L1

24

100 µF / 50 V

0.47 µH

48

4.7 µF / 100 V

2.2 µH

Test Condition

Input Voltage: Nominal

Output Load: Full Load

For more information, please visit the product page.