參數(shù)資料
型號: SA555
廠商: 意法半導體
英文描述: Precision Timers(精密定時器)
中文描述: 精密計時器(精密定時器)
文件頁數(shù): 7/10頁
文件大?。?/td> 110K
代理商: SA555
t = 0.5 ms / div
OUTPUT VOLTAGE= 5.0V/div
CAPACITOR VOLTAGE = 1.0V/div
R1 = R2 = 4.8k
, C1= 0.1
μ
F, R = 1k
Figure 14
C
(
μ
F)
10
1.0
0.1
0.01
0.001
0.1
1
10
100
1k
10k
f (Hz)
1M
R1+R2=10M
100k
10k
1k
Figure 15 :
FreeRunning FrequencyversusR
1
,
R
2
andC
1
Figure14showsactualwaveformsgeneratedinthis
mode of operation.
Thecharge time (outputHIGH) is givenby :
t
1
=0.693 (R
1
+ R
2
) C
1
andthe dischargetime (outputLOW) by :
t
2
=0.693 (R
2
) C
1
Thusthe total periodT is given by :
T = t
1
+ t
2
= 0.693(R
1
+ 2R
2
) C
1
Thefrequencyofoscillationis them:
f
=
1
T
=
(
R
1
+
2R
2
)
C
1
andmay be easily foundby figure 15.
Theduty cycleis givenby :
R
2
R
1
+
2R
2
1.44
D
=
Output
3
4
8
7
5
1
R1
C1
2
6
R2
Control
Voltage
NE555
V
CC
= 5 to 15V
0.01
μ
F
Figure 13
PULSEWIDTHMODULATOR
When the timer is connected in the monostable
mode and triggered with a continuouspulse train,
theoutputpulsewidthcanbe modulatedbyasignal
appliedto pin 5. Figure16 shows the circuit.
Trigger
Output
R
C
NE555
2
4
3
1
5
6
7
Modulation
Input
8
A
V
CC
Figure 16 :
PulseWidth Modulator.
NE555/SA555/SE555
7/10
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