E
Approved
Ericsson Internal
PRODUCT SPECIFICATION
No.
Checked
Date
1 (5)
Prepared (also subject responsible if other)
EAB/FJB/GK Johan Högberg
3/1301-BMR 659
Technical Specification
Uen
EN/LZT 146
381
R1C
Dec
2008
Rev
Reference
9
PKB
4302NG
PI
EAB/FJB/GK [Magnus Broman]
Intermediate Bus Converters,
Input
38-55
V,
42
A /
300
W
(MICANWO) 2008-06-05
A
© Ericsson Power Modules AB
EMC Specification
Conducted EMI measured according to EN55022, CISPR 22
and FCC part 15J (see test set-up). See Design Note 009 for
detailed information. The fundamental switching frequency is
166 kHz at 48
V input.
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.
If a ground layer is used, it should be connected to the output
of the DC/DC converter and the equipment ground or
chassis.
A ground layer will increase the stray capacitance in the PCB
and improve the high frequency EMC performance.
Output ripple and noise
Output ripple and noise measured according to figure below.
See Design Note 022 for detailed information.
Ceramic
Capacitor
Tantalum
Capacitor
EMI without filter
External filter (class B)
Example of an external input filter in order to meet class B in
EN 55022, CISPR 22 and FCC part 15J.
+Vout
C1, C2, C3 = 1
µF
C4, C5 = 2.2 nF
C6 = 220
µF
L1, L2 = 809
µH
(100 V, ceramic)
(2 kV, ceramic)
(100 V, electrolytic)
(common mode)
-Vout
0.1uF
+
10uF
*Conductor from Vout to capacitors = 50mm [1.97in.]
BNC
Connector
to Scope
Output ripple and noise test setup
EMI with filter
ERICSSON [ ERICSSON ]
