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SKIC2001A Datasheet(PDF) 4 Page - Semikron International

Part # SKIC2001A
Description  Short pulse suppression
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Manufacturer  SEMIKRON [Semikron International]
Direct Link  http://www.semikron.com
Logo SEMIKRON - Semikron International

SKIC2001A Datasheet(HTML) 4 Page - Semikron International

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Functional description
Interlock
Fig. 2 demonstrate the right function of interlock of TOP-
and BOTTOM-IGBT.
Fig. 2
Interlock function
At first BOTTOM is switched off immediately after the
corresponding input signal (at 5 µs), while TOP is switched
on with a delay of about 1 µs (setting of interlock 4 µs).
After 10 µs both inputs become „on“. This isn’t a correct
state (both IGBT „on“ means short circuit) and that is why
both are switched off. A switch on of BOTTOM is possible
not before TOP is „off“ (at 25 µs, interlock and delay time
about 5 µs).
Fig. 3 shows the behavior, if the interlock function isn’t
active (SELECT „low“). Both outputs react immediately to
the corresponding input (the difference is the signal delay
time).
Fig. 3
Interlock function not active
Shortpulse suppression
Fig. 4 presents the short pulse suppression. Pulses
shorter than 480 ns are suppressed (noise) and pulse
longer than 640 ns are valid.
Fig. 4 Short pulse suppression
VCEsat error processing
Fig. 5 VCE-error processing
In Fig. 5 the signals at the signal transformer are
described. About 860 ns after TOP is „on“ (delay time), we
see a positive needle on the transformer at the gate driver
side and the IGBT will switch on. After about 3 µs a VCE-
error signal will appear, the IGBT will switch off and an
error-signal (smaller positive needle) is transformed to the
low voltage side. The control IC processes this signal and
gives an off impulse (negative needle) to the IGBT. (The
needles on the transformers are converted in rectangular
pulses by a gate driver input with Schmitt trigger-
characteristic).


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