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AN4148 Datasheet(PDF) 3 Page - Fairchild Semiconductor

Part No. AN4148
Description  Audible Noise Reduction Techniques
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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AN4148 Datasheet(HTML) 3 Page - Fairchild Semiconductor

   
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APPLICATION NOTE
AN4148
3
©2005 Fairchild Semiconductor Corporation
Figure 6. Effect of Reducing the Snubber Capacitor
Figure 7. Zener Clamp Circuit with TVS
- Change the Fundamental Frequency of Burst Switching
In general, human ears are most sensitive to frequencies of
2~4kHz and are less sensitive to frequencies which are
higher or lower as shown in the equal loudness curves of
Figure 8. These are graphical representations of the
sensitivity of the ear to frequencies over the range of human
hearing at various loudness levels. Each line shows the
intensity level for the range of frequency that gives a
subjective perception of similar loudness in reference to a
starting level at 1kHz.
Figure 8. Equal Loudness Curves
Therefore, the subjective feeling of loudness can be lowered
by moving the fundamental frequency of noise out of the
2~4kHz range. The fundamental frequency of burst
switching can be changed by modifying the feedback
network. Figure 9 shows a typical feedback network. The
fundamental frequency can be reduced by one or more of the
following methods
- increasing CF
- increasing RD
- increasing CB
- decreasing RF
Figure 9. Typical Feedback Network of FPS
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Reducing the Snubber Capacitor
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TVS
(P6KE160CA)
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