Ericsson Internal
EJUNGYA
PRODUCT SPECIFICATION
1 (5)
Prepared (also subject responsible if other)
No.
3/1301-BMR 636 Uen
38
Technical Specification
Approved
Checked
Date
Rev
EN/LZT 146 3R9e4feRre5nDce October 2013
PKB 4000 series
SEC/D (Julia You)
ESHUHAN
2008-1-11
A
© Ericsson AB
DC/DC converters, Input 36-75 V, Output 30 A/90 W
EMC Specification
Conducted EMI measured according to EN55022, CISPR 22
and FCC part 15J (see test set-up). See Design Note 009 for
further information. The fundamental switching frequency is
198 kHz for PKB4711 SINB @ VI = 53 V, max IO.
Conducted EMI Input terminal value (typ)
Test set-up
Layout recommendation
The radiated EMI performance of the DC/DC converter will
depend on the PCB layout and ground layer design.
It is also important to consider the stand-off of the DC/DC
converter.
EMI without filter
If a ground layer is used, it should be connected to the output
of the DC/DC converter and the equipment ground or
chassis.
External filter (class B)
Required external input filter in order to meet class B in
EN 55022, CISPR 22 and FCC part 15J.
A ground layer will increase the stray capacitance in the PCB
and improve the high frequency EMC performance.
Filter components:
C1 = 0.68 µF
Output ripple and noise
C2,3 = 1.0 µF
C4,5 = 2.2 nF
C6,7 = 100 µF
L1,2 = 0.77 mH
Output ripple and noise measured according to figure below.
See Design Note 022 for detailed information.
Output ripple and noise test setup
EMI with filter
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