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LMC555CMM Datasheet(PDF) 6 Page - National Semiconductor (TI) |
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LMC555CMM Datasheet(HTML) 6 Page - National Semiconductor (TI) |
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6 / 12 page  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 µs/Div. Bottom Trace: Capacitor Voltage 1V/Div. RA = 3.9kΩ RB = 9kΩ C = 0.01µF FIGURE 5. Astable Waveforms DS008669-13 FIGURE 6. Free Running Frequency DS008669-14 VCC = 5V Top Trace: Input 4V/Div. TIME = 20 µs/Div. Middle Trace: Output 2V/Div. RA = 9.1 kΩ Bottom Trace: Capacitor 2V/Div. C = 0.01µF 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 kΩ C = 0.01µF FIGURE 9. Pulse Width Modulator Waveforms www.national.com 6 |
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