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| 型号： | IRMD2336DJ |
| 厂商： | International Rectifier |
| 文件页数： | 27/49页 |
| 文件大小： | 0K |
| 描述： | IC MOSFET DRIVER |
| 标准包装： | 1 |
| 系列： | * |
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IRS2336x(D) Family
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 input and output in
the low state with positive noise spikes of durations less than t FIL,IN ; the output does not change states. Example 2 of
Figure 19 shows the input and output in the high state with 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 positive pulse)
characteristic while the left shows the narrow pulse OFF (short negative 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.
The difference between the PW OUT and PW IN signals of both the narrow ON and narrow OFF cases is shown in
Figure 21; the careful reader will note the scale of the y-axis. The x-axis of Figure 21 shows the duration of PW IN ,
while the y-axis shows the resulting PW OUT –PW IN duration. This data illustrates the performance and near symmetry
of this input filter.
www.irf.com
27
? 2009 International Rectifier
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