KA555I datasheet(9/14 Pages) FAIRCHILD

部品番号	KA555I

部品情報	Single Timer

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メーカー	FAIRCHILD [Fairchild Semiconductor]

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KA555

9

6. Linear Ramp

When the pull-up resistor RA in the monostable circuit shown in Figure 1 is replaced with constant current source, the VC1

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

generated linear ramp waveforms.

In Figure 13, current source is created by PNP transistor Q1 and resistor R1, R2, and RE.

For example, if Vcc=15V, RE=20kΩ, R1=5kW, R2=10kΩ, and VBE=0.7V,

VE=0.7V+10V=10.7V

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

When the trigger starts in a timer configured as shown in Figure 13, the current flowing through capacitor C1 becomes a

8

4

7

1

2

3

5

6

CONT

GND

Vcc

DISCH

THRES

RESET

TRIG

OUT

+Vcc

R

A

C

R

B

Modulation

Output

Figure 11. Circuit for Pulse Position Modulation

Figure 12. Waveforms of pulse position modulation

Figure 13. Circuit for 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

RE

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

()

同様の部品番号 - KA555I

メーカー	部品番号	データシート	部品情報
Fairchild Semiconductor	KA555IDTF	156Kb / 14P	Single Timer

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