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NE555 Fiches technique(PDF) 8 Page - Fairchild Semiconductor

No de pièce NE555
Description  Single Timer
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Fabricant  FAIRCHILD [Fairchild Semiconductor]
Site Internet  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

NE555 Fiches technique(HTML) 8 Page - Fairchild Semiconductor

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LM555/NE555/SA555
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4. Pulse Width Modulation
4. Pulse Width Modulation
4. Pulse Width Modulation
4. Pulse Width Modulation
The timer output waveform may be changed by modulating the control voltage applied to the timer's pin 5 and changing the
reference of the timer's internal comparators. Figure 9 illustrates the pulse width modulation circuit.
When the continuous trigger pulse train is applied in the monostable mode, the timer output width is modulated according to
the signal applied to the control terminal. Sine wave as well as other waveforms may be applied as a signal to the control
terminal. Figure 10 shows the example of pulse width modulation waveform.
5. Pulse Position Modulation
5. Pulse Position Modulation
5. Pulse Position Modulation
5. Pulse Position Modulation
If the modulating signal is applied to the control terminal while the timer is connected for the astable operation as in Figure 11,
the timer becomes a pulse position modulator.
In the pulse position modulator, the reference of the timer's internal comparators is modulated which in turn modulates the
timer output according to the modulation signal applied to the control terminal.
Figure 12 illustrates a sine wave for modulation signal and the resulting output pulse position modulation : however, any wave
shape could be used.
Figure 8. Waveforms of Frequency Divider Operation
Figure 8. Waveforms of Frequency Divider Operation
Figure 8. Waveforms of Frequency Divider Operation
Figure 8. Waveforms of Frequency Divider Operation
Figure 9. Circuit for Pulse Width Modulation
Figure 9. Circuit for Pulse Width Modulation
Figure 9. Circuit for Pulse Width Modulation
Figure 9. Circuit for Pulse Width Modulation
Figure 10. Waveforms of Pulse Width Modulation
Figure 10. Waveforms of Pulse Width Modulation
Figure 10. Waveforms of Pulse Width Modulation
Figure 10. Waveforms of Pulse Width Modulation
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1
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5
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CONT
GND
Vcc
DISCH
THRES
RESET
TRIG
OUT
+Vcc
+Vcc
+Vcc
+Vcc
Trigger
Trigger
Trigger
Trigger
R
R
R
R
A
A
A
A
C
C
C
C
Output
Output
Output
Output
Input
Input
Input
Input


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