NE555 データシートの表示（PDF） - STMicroelectronics

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NE555

General-purpose single bipolar timers

STMicroelectronics 

Application information

NE555 - SA555 - SE555

4.3

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. Figure 18 shows

the circuit.

Figure 18. Pulse width modulator

Trigger

4

2

8

7

VCC

RA

Output

3

NE555

1

6

Modulation

Input

5

C

4.4

Linear ramp

When the pull-up resistor, RA, in the monostable circuit is replaced by a constant current

source, a linear ramp is generated. Figure 19 shows a circuit configuration that will perform

this function.

Figure 19. Linear ramp

Trigger

RE

4

8

2

7

NE555

2N4250

or equiv.

6

VCC

R1

C

Output

3

5

R2

0.01μF

1

12/20

Doc ID 2182 Rev 6

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