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LM555CN bảng dữ liệu(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
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Applications Information (Continued)
Figure 5 shows the waveforms generated in this mode of
operation.
The charge time (output high) is given by:
t
1 = 0.693 (RA +RB)C
And the discharge time (output low) by:
t
2 = 0.693 (RB)C
Thus the total period is:
T= t
1 +t2 = 0.693 (RA +2RB)C
The frequency of oscillation is:
Figure 6 may be used for quick determination of these RC
values.
The duty cycle is:
FREQUENCY DIVIDER
The monostable circuit of Figure 1 can be used as a fre-
quency divider by adjusting the length of the timing cycle.
Figure 7 shows the waveforms generated in a divide by three
circuit.
PULSE WIDTH MODULATOR
When the timer is connected in the monostable mode and
triggered with a continuous pulse train, the output pulse
width can be modulated by a signal applied to pin 5. Figure
8 shows the circuit, and in Figure 9 are some waveform
examples.
00785109
VCC = 5V
Top Trace: Output 5V/Div.
TIME = 20µs/DIV.
Bottom Trace: Capacitor Voltage 1V/Div.
RA = 3.9kΩ
RB =3kΩ
C = 0.01µF
FIGURE 5. Astable Waveforms
00785110
FIGURE 6. Free Running Frequency
00785111
VCC = 5V
Top Trace: Input 4V/Div.
TIME = 20µs/DIV.
Middle Trace: Output 2V/Div.
RA = 9.1kΩ
Bottom Trace: Capacitor 2V/Div.
C = 0.01µF
FIGURE 7. Frequency Divider
00785112
FIGURE 8. Pulse Width Modulator
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