전자부품 데이터시트 검색엔진 |
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KA555 데이터시트(PDF) 8 Page - Fairchild Semiconductor |
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KA555 데이터시트(HTML) 8 Page - Fairchild Semiconductor |
8 / 14 page KA555 KA555 KA555 KA555 8 8 8 8 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 8 4 7 1 2 3 5 6 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 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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