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TS555MN bảng dữ liệu(PDF) 9 Page - STMicroelectronics

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ASTABLE OPERATION
When the circuit is connected as shown in figure 4
(pin 2 and 6 connected) it triggers itself and free
runs as a multivibrator. The external capacitor
charges through RA and RB an d discharges
through RB only. Thus the duty cycle may be pre-
cisely set by the ratio of these two resistors.
In the astable mode of operation, C charges and
discharges between 1/3 VCC and 2/3 VCC.As in the
triggered mode, the charge and discharge times
and therefore frequency, are independent of the
supply voltage.
Figure 5 shows actual waveforms generated in this
mode of operation.
The charge time (output HIGH) is given by :
t1 = 0.693 (RA +RB)C
and the discharge time (output LOW) by :
t2 = 0.693 (RB)C
Thus the total period T is given by :
T = t1 + t2 = 0.693 (RA +2RB)C
The frequency of oscillation is then :
f
= 1
T
=
1.44
(RA + 2RB)C
The duty cycle is given by : D
=
RB
RA + 2RB
VCC
Reset
Out
3
4
8
7
5
1
TS555
R
C
2
6
R
A
B
Control
Voltage
0.01 F
µ
Figure 4
µ
t = 0.5 ms / div
OUTPUT VOLTAGE = 5.0V/div
CAPACITOR VOLTAGE = 1.0V/div
L
R = R = 4.8 k , C = 0.1 F , R = 1.0k
AB
Figure 5
TS555C,I,M
9/12


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