KA555ID Fairchild Semiconductor, KA555ID Datasheet - Page 9

• Manufacturer Part Number: KA555ID
• Description: IC TIMER CONTROLLER SGL 8-SOP
• Manufacturer: Fairchild Semiconductor
• Type: 555 Type, Timer/Oscillator (Single)r

Specifications of KA555ID

• Voltage - Supply: 4.5 V ~ 16 V
• Current - Supply: 7.5mA
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOIC (3.9mm Width)
• Frequency: 100kHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Count: -

6. Linear Ramp
6. Linear Ramp
When the pull-up resistor RA in the monostable circuit shown in Figure 1 is replaced with constant current source, the V
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 R
For example, if Vcc=15V, R
V
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
6. Linear Ramp
6. Linear Ramp
E
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
Output
=0.7V+10V=10.7V
Output
Output
Output
Output
V
E
=
Figure 13. Circuit for Linear Ramp
Figure 13. Circuit for Linear Ramp
Figure 13. Circuit for Linear Ramp
Figure 13. Circuit for Linear Ramp
I
3
2
C
V
2
3
BE
=
OUT
TRIG
TRIG
RESET
OUT
V CC V E
RESET
+
Here, V
4
4
R 1
R E
GND
GND
R 2
–
+
1
1
R 2
E is
Vcc
V
THRES
DISCH
8
CONT
E
THRES
Vcc
CC
DISCH
=20k , R1=5kW, R2=10k , and V
CONT
8
7
6
5
12
Modulation
Modulation
Modulation
Modulation
6
7
5
13
C2
C C C C
R R R R
R R R R
A A A A
B B B B
R
+Vcc
+Vcc
+Vcc
+Vcc
C1
E
Q1
+Vcc
R2
R1
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
BE
=0.7V,
Figure 14. Waveforms of Linear Ramp
Figure 14. Waveforms of Linear Ramp
Figure 14. Waveforms of Linear Ramp
Figure 14. Waveforms of Linear Ramp
E
.
KA555
KA555
KA555
KA555
C1
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