SCM474K601H7N29-F Datasheet, PDF (1/2 Pages) Cornell Dubilier Electronics – Single/Dual IGBT Snubber Capacitor Modules

Type SCM Single/Dual IGBT Snubber Capacitor Modules
Applications
Use style SCM as a discharge restrictive de-coupling to
protect dual IGBT modules from overvoltage, Figure
1. Style SCM may also be used as an “N” or “P” type
snubber component for a clamp snubber where single
IGBT modules are used, Figure 2.
Highlights
• Mount directly to the IGBT module
• Low inductance
• Low Loss
• Hyperfast diodes integrated into package
Discharge Restrictive De-coupling
The circuit in Figure 1 operates on the same principles
as the de-coupling capacitor, but only during turn-off
switching. As the IGBT turns off, energy trapped in
the loop inductance is transferred to the capacitor. The
diode blocks oscillations from occurring and excess
charge on the capacitor is discharged through the
external resistor.
Complies with the EU Directive 2002/95/EC re-
quirement restricting the use of Lead (Pb), Mer-
cury (Hg), Cadmium (Cd), Hexavalent chromium
(Cr(VI)), PolyBrominated Biphenyls (PBB) and
PolyBrominated Diphenyl Ethers (PBDE).
• 1 or 2 wire taps for connecting external resistor
• Flame resistant case and epoxy, meets UL 94V0
• Other terminal pitches and capacitance values
available.
RCD Clamp
The function of this snubber is similar to a clamp, Figure
2. At turn-off, the snubber diode is forward biased and
the snubber is activated. The energy trapped in the stray
inductance is absorbed by the snubber capacitor. During
turn-on the snubber caps that were fully charged to
bus voltage have a discharge path through the forward
biased free-wheel diode, the IGBT, and the snubber
resistors. This reduces the reverse recovery voltage
transient.
Figure 1
Style SCM Discharge restrictive decoupling used
to protect dual IGBT modules
Dual
IGBT
Module
External
Resistor
SCM
“N” Type
Module
Figure 2
Style SCM “P” type and “N” type used as a clamp
to protect an inverter using two “single” IGBT modules
Single
IGBT
Module
SCM
“P” Type
Module
External
Resistor
Single
IGBT
Module
SCM
“N” Type
Module
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