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LM556MWC bảng dữ liệu(PDF) 11 Page - Texas Instruments |
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LM556MWC bảng dữ liệu(HTML) 11 Page - Texas Instruments |
11 / 20 page TS th tl 0 V VCC VCC 0 V 2/3 VCC 1/3 VCC Output Waveform Capacitor Voltage Waveform l 2 t = 0.693R C h 1 2 t = 0.693(R +R )C LM556 www.ti.com SNAS549A – MARCH 2000 – REVISED OCTOBER 2015 Typical Application (continued) where • th represents the time it takes to charge the capacitor of each individual timer (3) where • tl represents the time it takes to discharge the capacitor. (4) 8.2.2 Detailed Design Procedure Given that the resonant frequency of the piezo transducer is about 3 kHz, by choosing R1, C and using Equation 1, R2 can be determined to be 23.5 kΩ. In order to have the sound be audible for half the period, the duty cycle for the triggering timer should be 50%. However, this is difficult to achieve because the recommended minimum value for R1 is 1 kΩ. Therefore, a duty cycle of 49% was chosen for this application. By choosing R1 to be 1 kΩ and using Equation 2, R2 is found to be 24.5 k Ω. 8.2.3 Application Curve Figure 14. Capacitor Voltage and Output Waveforms in Astable Mode Copyright © 2000–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM556 |
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