sa555d-dt STMicroelectronics, sa555d-dt Datasheet - Page 13

• Manufacturer Part Number: sa555d-dt
• Description: General Purpose Single Bipolar Timers
• Manufacturer: STMicroelectronics

NE555 - SA555 - SE555
4.3
4.4
Pulse width modulator
When the timer is connected in the monostable mode and triggered with a continuous pulse
train, the output pulse width can be modulated by a signal applied to pin 5.
the circuit.
Figure 18. Pulse width modulator
Linear ramp
When the pull-up resistor, R
source, a linear ramp is generated.
this function.
Figure 19. Linear ramp
Trigger
Output
Output
Trigger
2
3
A
2
3
, in the monostable circuit is replaced by a constant current
4
NE555
4
Figure 19
NE555
1
1
8
shows a circuit configuration that will perform
8
7
5
6
7
5
6
Modulation
or equiv.
0.01
2N4250
Input
R
μ
C
E
F
Application information
R
C
A
R2
R1
V
CC
Figure 18
V
CC
shows
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