NE555D 데이터 시트보기 (PDF) - Tiger Electronic

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NE555D

Single Timer

Tiger Electronic 

NE555N/NE555D

Since RD is normally RB>>RD although related to the size of discharging Tr.,

Consequently, if the timer operates in astable, the period is the same with

'T=tH+tL=0.693(RA+RB)C1+0.693RBC1=0.693(RA+2RB)C1' because the period is the sum of

the charge time and discharge time. And since frequency is the reciprocal of the period, the

following applies.

3、 Frequency divider

By adjusting the length of the timing cycle, the basic circuit of Figure 1 can be made to

operate as a frequency divider. Figure8. illustrates a divide-by-three circuit that makes use

of the fact that retriggering cannot occur during the timing cycle.

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

modulation circuit. illustrates the pulse width

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.

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