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NE555P Scheda tecnica(PDF) 13 Page - Texas Instruments

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Il numero della parte NE555P
Spiegazioni elettronici  PRECISION TIMERS
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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
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Product Folder Link(s): NA555 NE555 SA555 SE555


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