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LM556MWC bảng dữ liệu(PDF) 11 Page - Texas Instruments

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background image
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
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