Data Sheet
March 26, 2008
FLT007A0/FLT007A0-SR Input Filter Modules
75Vdc Input Voltage Maximum, 7A Output Current Maximum
Level
80
[dBµV]
VI(+)
VI(+)
VO(+)
70
60
50
40
30
FILTER
MODULE
VI(-)
C1
DC/DC
CONVERTER
MODULE
VI(-)
CASE
VO(-)
CHASSIS GROUND
C2
C3
C4
C5
20
10
SHIELD PLANE
0
150k
300k
500k
Figure 7. . Schematic diagram showing
recommended connection of the FLT007A0
filter module with metal-cased DC/DC converter
modules.
C
2
V
IN
+
V
I
+
V
IN
+
V
O
+
1M
2M
3M 4M 5M
Frequency [Hz]
7M
10M
30M
Figure 9. Experimental results showing
conducted EMI measured using a FLT007A0
module with a QBE025A0B1 DC/DC converter.
C
4
V
O
+
Input
FLT007A0
MODULE
GND
V
IN
−
V
O
−
C
1
DC/DC
CONVERTER
CASE
V
I
−
Load
V
IN
−
CHASSIS
GROUND
SHIELD
PLANE
V
O
−
C
3
C
5
Figure 8. Diagram showing recommended
layout of the FLT007A0 filter module with metal-
case DC/DC converter modules.
Example Data Showing Results using
the FLT007A0 Modules
Figure 9 shows example results obtained using a
QBE025A0B1 DC/DC converter module with the
FLT007A0 filter module. The QBE025A0B1 module is
operated at an input voltage of 43.2V and output
loading corresponding to an input current of 6.2A, a
level close to the 7A capability of the FLT007A0 filter
module. A 10nF ceramic capacitor was connected
between Vin(-) and Vo(-) and a 4700pF ceramic
capacitor between Vin(+) and Vo(+). The results show
that the filter module is capable of meeting EN55022
Class B limits with sufficient margin.
LINEAGE
POWER
6
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
