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參數(shù)資料
| 型號(hào)： | LM555H-MLS/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬波形發(fā)生器 |
| 英文描述： | PULSE; RECTANGULAR, TIMER, MBCY8 |
| 封裝： | TO-5, 8 PIN |
| 文件頁(yè)數(shù)： | 15/16頁(yè) |
| 文件大小： | 443K |
| 代理商： | LM555H-MLS/NOPB |
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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.
DS007851-9
VCC = 5V
Top Trace: Output 5V/Div.
TIME = 20s/DIV.
Bottom Trace: Capacitor Voltage 1V/Div.
RA = 3.9k
RB =3k
C = 0.01F
FIGURE 5. Astable Waveforms
DS007851-10
FIGURE 6. Free Running Frequency
DS007851-11
VCC = 5V
Top Trace: Input 4V/Div.
TIME = 20s/DIV.
Middle Trace: Output 2V/Div.
RA = 9.1k
Bottom Trace: Capacitor 2V/Div.
C = 0.01F
FIGURE 7. Frequency Divider
DS007851-12
FIGURE 8. Pulse Width Modulator
DS007851-13
VCC = 5V
Top Trace: Modulation 1V/Div.
TIME = 0.2 ms/DIV.
Bottom Trace: Output Voltage 2V/Div.
RA = 9.1k
C = 0.01F
FIGURE 9. Pulse Width Modulator
LM555
www.national.com
8
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM555I | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LM555IM | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LM555IN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LM555J | 制造商: 功能描述: 制造商:undefined 功能描述: |
| LM555J/883 | 制造商:Texas Instruments 功能描述:Standard Timer Single 8-Pin CDIP Rail 制造商:Texas Instruments 功能描述:STD TIMER SGL 8CDIP - Rail/Tube |
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