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NE555 Datasheet(PDF) 10 Page - Diodes Incorporated

Part # NE555
Description  Timing from microseconds to hours
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Manufacturer  DIODES [Diodes Incorporated]
Direct Link  http://www.diodes.com
Logo DIODES - Diodes Incorporated

NE555 Datasheet(HTML) 10 Page - Diodes Incorporated

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NE555/SA555/NA555
Document number: DS35112 Rev. 5 - 2
10 of 14
www.diodes.com
February 2021
© Diodes Incorporated
NE555
Typical Applications Characteristics (cont.)
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 10 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 11 shows the resulting output pulse-width modulation. While
a sine-wave modulation signal is shown, any wave shape could be used.
RL
RA
THRES
TRIG
DISCH
RESET
CONT
VCC
GND
OUT
Output
2
5
1
3
8
4
VCC
(5V to 15V)
C
Clock Input
7
6
Modulation
Input
(see Note A)
The modulating signal can be directly 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.
Fig. 10 Circuit for Pulse width modulation
Fig. 11 Pulse width modulation timing diagrams
Pulse Position Modulation
As shown in Figure 12, any of these timers can be used as a pulse-position modulator. This application modulates the threshold voltage and,
thereby, the time delay, of a free-running oscillator. Figure 13 shows a triangular-wave modulation signal for such a circuit; however, any
wave shape could be used.
RL RA
THRES
TRIG
DISCH
RESET
CONT
VCC
GND
OUT
Output
2
5
1
3
8
4
VCC
(5V to 15V)
C
7
6
Modulation
Input
(see Note A)
The modulating signal can be directly 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.
RB
Fig. 12 Circuit for pulse position modulation
Fig. 13 Pulse position modulation timing diagrams


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