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LM555CN bảng dữ liệu(PDF) 8 Page - National Semiconductor (TI) |
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LM555CN bảng dữ liệu(HTML) 8 Page - National Semiconductor (TI) |
8 / 12 page 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 www.national.com 8 |
Số phần tương tự - LM555CN |
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Mô tả tương tự - LM555CN |
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