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AUIRS2336S
approximately the same duration as the input signal. The lower pair of waveforms (Example 2) show an input signal
with a duration slightly longer then t FIL,IN ; the resulting output is approximately the same duration as the input signal.
Figure 17: Typical input filter
Figure 18: Advanced input filter
Short-Pulse / Noise Rejection
This device’s input filter provides protection against short-pulses (e.g., noise) on the input lines. If the duration of the
input signal is less than t FIL,IN , the output will not change states. Example 1 of Figure 19 shows the output in the high
state with input positive noise spikes of durations less than t FIL,IN ; the output does not change states. Example 2 of
Figure 19 shows the output in the low state with input negative noise spikes of durations less than t FIL,IN ; the output
does not change states.
Figure 19: Noise rejecting input filters
Figures 20 and 21 present lab data that illustrates the characteristics of the input filters while receiving ON and OFF
pulses.
The input filter characteristic is shown in Figure 20; the left side illustrates the narrow pulse ON (short negative
pulse) characteristic while the left shows the narrow pulse OFF (short positive pulse) characteristic. The x-axis of
Figure 20 shows the duration of PW IN , while the y-axis shows the resulting PW OUT duration. It can be seen that for a
PW IN duration less than t FIL,IN , that the resulting PW OUT duration is zero (e.g., the filter rejects the input signal/noise).
We also see that once the PW IN duration exceed t FIL,IN , that the PW OUT durations mimic the PW IN durations very well
over this interval with the symmetry improving as the duration increases. To ensure proper operation of the HVIC, it
is suggested that the input pulse width for the high-side inputs be ≥ 500 ns.
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23
? 2009 International Rectifier
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