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參數資料
| 型號： | TS555IDT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 模擬波形發生器 |
| 英文描述： | PULSE; RECTANGULAR, 2 MHz, TIMER, PDSO8 |
| 封裝： | MICRO, PLASTIC, SO-8 |
| 文件頁數： | 5/20頁 |
| 文件大小： | 232K |
| 代理商： | TS555IDT |
TS555
Application information
13/20
4.2
Astable operation
When the circuit is connected as shown in Figure 6 (pins 2 and 6 connected) it triggers itself
and runs as a multi-vibrator. The external capacitor charges through RA and RB and
discharges through RB only. Therefore, the duty cycle may be precisely 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 6.
Application schematic
Figure 7 shows actual waveforms generated in this mode of operation.
The charge time (output HIGH) is given by:
t1 = 0.693 (RA + RB) C
The discharge time (output LOW) by:
t2 = 0.693 x RB x C
Thus the total period T is given by:
T = t1 + t2 = 0.693 (RA + 2RB) C
The frequency of oscillation is then:
The duty cycle is given by:
Figure 7.
Timing diagram
VCC
Reset
Out
3
4
8
7
5
1
TS555
R
C
2
6
R
A
B
Control
Voltage
0.01 F
μ
f =
1
T
--- =
1.44
(RA
2RB
)C
+
--------------------------------------
D =
RB
RA
2RB
+
---------------------------
Ω
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
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