Data Sheet
FLT012A0Z/FLT012A0-SZ Input Filter Modules
February 9, 2012
75Vdc Input Voltage Maximum, 12A Output Current Maximum
VI(+)
VI(+)
VO(+)
Level [dBµV]
DC/DC
C1
C2
FILTER
MODULE
80
70
60
50
40
30
20
10
CONVERTER
MODULE
VI(-)
VI(-)
VO(-)
CASE
+x
x
+
C3
C4
C5
CHASSIS GROUND
x
+
xx
xx
+
+
+
x
+
+
SHIELD PLANE
Figure 7. Schematic diagram showing
0
150k
300k
500k
1M
2M
3M
5M 7M 10M
30M
recommended connection of the FLT012A0 filter
module with metal-cased DC/DC converter
modules.
Frequency [Hz]
x
+
MES CE1220111019_fin QP
MES CE1220111019_fin AV
MES CE1220111019_pre PK
MES CE1220111019_pre AV
Load
Input
Figure 9. Experimental results showing
C4
C2
conducted EMI measured using a FLT012A0
module with a QBVW033 DC/DC converter.
VO+
VI+
VO+
VIN+
FLT012A0
MODULE
DC/DC
CONVERTER
C1
GND
CASE
SHIELD
PLANE
VI-
VO-
VO
−
VIN-
CHASSIS
GROUND
C3
C5
Figure 8. Diagram showing recommended layout
of the FLT012A0 filter module with metal-case
DC/DC converter modules.
Example Data Showing Results using
the FLT012A0 Modules
Figure 9 shows example results obtained using a
QBVW033 DC/DC converter module with the
FLT012A0 filter module. The QBVW033 module is
operated at an input voltage of 48V and output
loading corresponding to an input current of 8.7A, a
level close to the 12A capability of the FLT012A0 filter
module. Board capacitance was as per
recommendations in the QBVW033 datasheet. The
results show that the filter module is capable of
meeting EN55022 Class A limits with 11 margin.
LINEAGE POWER
6
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
