LM555/NE555/SA555

9

9

9

9

6. Linear Ramp

6. Linear Ramp

6. Linear Ramp

6. Linear Ramp

increases linearly, generating a linear ramp. Figure 13 shows the linear ramp generating circuit and Figure 14 illustrates the

generated linear ramp waveforms.

Ic=(15-10.7)/20k=0.215mA

8

4

7

1

2

3

5

6

CONT

GND

Vcc

DISCH

THRES

RESET

TRIG

OUT

+Vcc

+Vcc

+Vcc

+Vcc

R

R

R

R

A

A

A

A

C

C

C

C

R

R

R

R

B

B

B

B

Modulation

Modulation

Modulation

Modulation

Output

Output

Output

Output

Figure 11. Circuit for Pulse Position Modulation

Figure 11. Circuit for Pulse Position Modulation

Figure 11. Circuit for Pulse Position Modulation

Figure 11. Circuit for Pulse Position Modulation

Figure 12. Waveforms of pulse position modulation

Figure 12. Waveforms of pulse position modulation

Figure 12. Waveforms of pulse position modulation

Figure 12. Waveforms of pulse position modulation

Figure 13. Circuit for Linear Ramp

Figure 13. Circuit for Linear Ramp

Figure 13. Circuit for Linear Ramp

Figure 13. Circuit for Linear Ramp

Figure 14. Waveforms of Linear Ramp

Figure 14. Waveforms of Linear Ramp

Figure 14. Waveforms of Linear Ramp

Figure 14. Waveforms of Linear Ramp

1

5

6

7

8

4

2

3

RESET

Vcc

DISCH

THRES

CONT

GND

OUT

TRIG

+Vcc

C2

R1

R2

C1

Q1

Output

I

C

V

CC

V

E

–

R

E

---------------------------

=

12

()

Here, V

E is

V

E

V

BE

R

2

R

1

R

2

+

----------------------V

CC

+

=

13

()