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參數(shù)資料
| 型號： | LMC555ENG |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬波形發(fā)生器 |
| 英文描述： | PULSE; RECTANGULAR, 3 MHz, TIMER, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 389K |
| 代理商： | LMC555ENG |
Application Info (Continued)
The charge time (output high) is given by
t
1 = Ln2 (RA +RB)C
And the discharge time (output low) by:
t
2 = Ln2 (RB)C
Thus the total period is:
T= t
1 +t2 = Ln2 (RA +RB)C
The frequency of oscillation is:
Figure 6 may be used for quick determination of these RC
Values. The duty cycle, as a fraction of total period that the
output is low, 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 the Control
Voltage Terminal.
Figure 8 shows the circuit, and in Figure 9
are some waveform examples.
PULSE POSITION MODULATOR
This application uses the timer connected for astable opera-
tion, as in
Figure 10, with a modulating signal again applied
to the control voltage terminal. The pulse position varies with
DS008669-12
VCC = 5V
Top Trace: Output 5V/Div.
TIME = 20 s/Div.
Bottom Trace: Capacitor Voltage 1V/Div.
RA = 3.9k
RB =9k
C = 0.01F
FIGURE 5. Astable Waveforms
DS008669-13
FIGURE 6. Free Running Frequency
DS008669-14
VCC = 5V
Top Trace: Input 4V/Div.
TIME = 20 s/Div.
Middle Trace: Output 2V/Div.
RA = 9.1 k
Bottom Trace: Capacitor 2V/Div.
C = 0.01F
FIGURE 7. Frequency Divider Waveforms
DS008669-20
FIGURE 8. Pulse Width Modulator
DS008669-15
VCC = 5V
Top Trace: Modulation 1V/Div.
TIME = 0.2 ms/Div.
Bottom Trace: Output Voltage 2V/Div.
RA = 9.1 k
C = 0.01F
FIGURE 9. Pulse Width Modulator Waveforms
LMC555
www.national.com
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