NMK Series

3kVDC Isolated 2W Single & Dual Output DC/DC Converters

KDC_NMKC.C01 Page 3 of 5

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RIPPLE & NOISE CHARACTERISATION METHOD

All measurement to be taken with the following components connected to the UUT as detailed below.

50 Ohm coax cable, solder connections one end, BNC plug at the other end.

C1

– 1μF X7R multilayer ceramic capacitor rated at minimum 3 x the output voltage of the UUT

C2

– 10μF tantalum capacitor rated at minimum 1.5 x the output voltage of the UUT with ESR of less

than 100 milliohms at 100 kHz e.g. AVX TPS series.

C3

– 100nF multilayer ceramic capacitor, general purpose

R1

– 450 Ohm resistor, carbon film, ±1%

R2

– 50 Ohm BNC termination

T1

– 3T of the coax cable through a ferrite toroid eg Ferroxcube TN32/19/13-3E25

RLOAD – Resistive load at the UUT maximum rating. Connections via twisted wires.

Differential Mode Noise Test Schematic

OSCILLOSCOPE

Y INPUT

SUPPLY

C1 C2 C3

R1

T1

R2

Input

Output

DC/DC Converter

R LOAD

+

+

-

-