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NE555P Scheda tecnica(PDF) 13 Page - Texas Instruments |
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NE555P Scheda tecnica(HTML) 13 Page - Texas Instruments |
13 / 27 page www.ti.com Pulse-Width Modulation THRES GND C RA RL VCC (5 V to 15 V) Output DISCH OUT VCC RESET TRIG CONT Modulation Input (see Note A) Clock Input NOTE A: The modulating signal can be direct or capacitively coupled to CONT. For direct coupling, the effects of modulation source voltage and impedance on the bias of the timer should be considered. 4 8 3 7 6 2 5 Pin numbers shown are for the D, JG, P, PS, and PW packages. 1 Time − 0.5 ms/div Capacitor Voltage Output Voltage Clock Input Voltage RA = 3 kΩ C = 0.02 µF RL = 1 kΩ See Figure 18 Modulation Input Voltage NA555, NE555, SA555, SE555 PRECISION TIMERS SLFS022G – SEPTEMBER 1973 – REVISED MARCH 2008 The operation of the timer can be modified by modulating the internal threshold and trigger voltages, which is accomplished by applying an external voltage (or current) to CONT. Figure 18 shows a circuit for pulse-width modulation. A continuous input pulse train triggers the monostable circuit, and a control signal modulates the threshold voltage. Figure 19 shows the resulting output pulse-width modulation. While a sine-wave modulation signal is shown, any wave shape could be used. Figure 18. Circuit for Pulse-Width Modulation Figure 19. Pulse-Width-Modulation Waveforms Copyright © 1973–2008, Texas Instruments Incorporated Submit Documentation Feedback 13 Product Folder Link(s): NA555 NE555 SA555 SE555 |
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