NQB-420DWA-AN Datasheet, PDF (20/36 Pages) CUI INC – FULLY REGULATED ADVANCED BUS CONVERTERS

CUI Inc │ SERIES: NQB-D │ DESCRIPTION: FULLY REGULATED ADVANCED BUS CONVERTERS
EMC Specification
Conducted EMI measured according to EN55022, CISPR
22 and FCC part 15J (see test set-up). The fundamental
switching frequency is 140 kHz for NQB at V_I = 53 V, max
I_O.
Conducted EMI Input terminal value (typ)
date 02/20/2013 │ page 20 of 36
EMI without filter
Optional external filter for class B
Suggested external input filter in order to meet class B
in EN 55022, CISPR 22 and FCC part 15J.
Filter components:
C1 = 1 μF
0
C2 = 1 μF+220 μF
C3 = 1 μF+220 μF
C4
L1
L2
C4,C5 = 2.2 nF
++
L1 = 810 μH
C1
C2
C3
Module
R _{L2 = 810 μH}
-
-
C5
0
Test set-up
Layout recommendations
The radiated EMI performance of the product will
depend on the PWB layout and ground layer design.
It is also important to consider the stand-off of
the product. If a ground layer is used, it should
be connected to the output of the product and the
equipment ground or chassis.
A ground layer will increase the stray capacitance
in the PWB and improve the high frequency EMC
performance.
Output ripple and noise
Output ripple and noise measured according to figure
below.
Output ripple and noise test setup
EMI with filter
cui.com