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Design Guide & Applications Manual
For VI-200 and VI-J00 Family DC-DC Converters and Configurable Power Supplies
vicorpower.com 800-735-6200 Applications Engineering 1-800-927-9474 Rev. 2.1
Page 21 of 88
9. EMC Considerations
Differential and Common-Mode Filter with More
than One Module. No special precautions are needed
when using two or more modules. The filter required will
have the same characteristics as a single module filter,
however the wire size on the magnetics will need to
reflect the increased input current. Shown below is the
input conducted noise for two modules sharing a
common input source.
+IN
GATE
IN
GATE
OUT
–IN
+OUT
+S
T
–S
–OUT
Load 1
Load 2
L2
C4
L1
C1
a
C2
a
C2
d
C2
c
C2
b
C3
a
C3
b
C3
c
C3
d
C1
b
+IN
GATE
IN
GATE
OUT
–IN
+OUT
+S
T
–S
–OUT
C1
a
–
C1
b
= 47 μF
C2
a
–
C2
d
= 4,700 pF (Vicor Part # 01000)
C3
a
–
C3
d
= 0.01 μF (Vicor Part # 04872)
C4 = 2.2 μF
L1 = 3,000 μH (Vicor Part # 31742)
L2 = 20 μH
Conditions
Light Load = 3 A
Nominal Load = 15 A
Full Load = 30 A
Figure 9–4 — Conducted noise, multiple zero-current-switching converters
3 Amp / 3 Amp Load
3 Amp / 6 Amp Load
15 Amp / 15 Amp Load
3 Amp / 30 Amp Load
15 Amp / 30 Amp Load 30 Amp / 30 Amp Load
Differential and Common-Mode Filter with More than One Module
48 V Inputs, 5 V Outputs (Two Vicor VI-230-CV Modules)
Conducted Noise vs. Load
Three common-mode chokes are offered as standard accessories.
NOTE
: Common-mode filters may be common to one or
more modules, but only one should be used with modules
interconnected via GATE IN’s or, GATE OUT to GATE IN. As
an example, Driver / Booster arrays or Drivers with GATE IN’s
tied together to provide a common disable function.
Part Inductance Maximum Resistance
Number Each Winding DC Current Each Winding
31743 1,000 µH 12 Amperes 6.5 mΩ
31742 3,000 µH 7 Amperes 18 mΩ
31943 2,163 µH 1 Ampere 42 mΩ