TLC555-Q1 Datasheet, PDF (14/25 Pages) Texas Instruments – LinCMOS™ TIMER

TLC555-Q1
SLFS078B – OCTOBER 2006 – REVISED OCTOBER 2015
Typical Applications (continued)
9.2.1.3 Application Curve
V_DD = 5 V
R_A = 1 kW
C = 0.1 mF
See Figure 15
Input Voltage
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Output Voltage
Capacitor Voltage
Time − 0.1 ms/div
Figure 13. Completed Timing Waveforms for Missing-Pulse Detector
9.2.2 Pulse-Width Modulation
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 14 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 15 shows the resulting output pulse-width modulation. While a sine-wave modulation
signal is shown, any wave shape could be used.
V_DD (5 V to 15 V)
4
8
R_L
RESET
Clock
Input
2
TRIG
V_DD
3
OUT
7
DISCH
Modulation
Input
5
CONT
(see Note A)
6
THRES
GND
1
R_A
Output
C
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.
Figure 14. Circuit for Pulse-Width Modulation
14
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