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LM555CN bảng dữ liệu(PDF) 9 Page - Fairchild Semiconductor

tên linh kiện LM555CN
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LM555/NE555/SA555
9
9
9
9
6. Linear Ramp
6. Linear Ramp
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 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
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
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
()


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