JW075B5 Lineage Power, JW075B5 Datasheet - Page 16

• Manufacturer Part Number: JW075B5
• Manufacturer: Lineage Power

Data Sheet
April 2008
Lineage Power
Filtering Suggestions for FCC Class B Conducted Emissions Compliance
The common-mode input inductor should present a high impedance to frequencies in the 1 MHz to 30 MHz range.
The inductor (L1) should provide good high-frequency attenuation, while offering adequate leakage inductance for
differential noise attenuation at the 300 kHz switching frequency. The case capacitors, C1, C2, C3, and C4, should
have good high-frequency characteristics up to 30 MHz. Surface-mounted ceramic capacitors mounted close to
the module, as shown in Figure 28, provide excellent results. The voltage rating of the case capacitors, C1 through
C4, depends on the desired isolation voltage between primary and secondary. For example, the module isolation
voltage is 1500 Vdc. To maintain that rating, C1 through C4 must be rated at 750 Vdc each.
Vdc input(+) and Vdc input(–) planes should overlay each other, as should the V
V
connections are low impedance.
Lineage Power also offers a filter module (FLTR100V10, 107742447), which may be used effectively in place of
the common-mode inductor shown in Figure 27 and Figure 28.
Vdc INPUT(+)
Vdc INPUT(–)
Note: Please refer to the FLTR100V10 data sheet for applications notes when designing for EMI
O
(+) and V
compliance.
O
(–) planes. Avoid routing signals or planes under the power module or the filter module. Ensure all
Figure 28. Recommended Layout for FCC Class B Filtering
JW075A5, JW075B5, JW075C5 Power Modules: dc-dc Converters:
INDUCTOR
COMMON-
36 Vdc to 75 Vdc Input; 5 Vdc, 12 Vdc, or 15 Vdc Output; 75 W
MODE
L1
C5
V
V
I
I
(+)
(–)
CASE
C2
C1
MODULE
POWER
SHIELD
PLANE
I
(+) and V
C4
C3
I
(–) planes, as should the
(continued)
8-1328 (C).e
16
V
V
O
O
(+)
(–)