參數(shù)資料
型號： SA555N
廠商： 意法半導體
元件分類： 定時器
英文描述： GENERAL PURPOSE SINGLE BIPOLAR TIMERS
中文描述： 一般用途的單雙極型定時器
文件頁數(shù)： 8/10頁
文件大?。?/td> 110K
代理商： SA555N
LINEARRAMP
When the pullupresistor,R
A
, in the monostablecir-
cuitisreplacedbyaconstantcurrentsource,alinear
ramp is generated. Figure 17 shows a circuit con-
figuration that will perform this function.
Trigger
Output
C
NE555
2
4
3
1
5
6
7
8
E
V
CC
0.01
μ
F
R2
R1
R
2N4250
or equiv.
Figure17.
Out
R
A
51k
C
NE55
2
4
3
1
5
6
7
8
V
CC
R
B
22k
0.01
μ
F
V
CC
0.01
μ
F
Figure 19 :
50%Duty Cycle Oscillator.
Figure18 showswaveformsgeneratorbythe linear
ramp.
Thetime interval is given by :
T
=(
2/3 V
CC
R
E
(
R
1
+
R
2
)
C
R
1
V
CC
V
BE
(
R
1
+
R
2
)
V
BE
=
0.6V
Figure 18 :
LinearRamp.
V
= 5V
Time = 20
μ
s/DIV
R
1
= 47k
R
2
= 100k
R
E
= 2.7k
C = 0.01
μ
F
Top trace : input 3V/DIV
Middle trace : output 5V/DIV
Bottom trace : output 5V/DIV
Bottom trace : capacitor voltage
1V/DIV
50% DUTY CYCLE OSCILLATOR
For a 50% duty cycle the resistors R
A
andR
E
may
beconnectedasinfigure19.Thetimepreriodforthe
outputhigh is the sameas previous,
t
1
= 0.693R
A
C.
For the outputlow it is t
2
=
[
(
R
A
R
B
)
(
R
A
+
R
B
)
]
CLn
Thus thefrequencyof oscillationis f
=
R
B
2R
A
2R
B
R
A
1
t
1
+
t
2
Notethatthis circuit will not oscillate if R
B
is greater
than1/2 R
A
becausethe junctionof R
A
andR
B
can-
notbring pin2 downto1/3V
CC
andtriggerthelower
comparator.
ADDITIONAL INFORMATION
Adequatepower supply bypassing is necessary to
protect associated circuitry. Minimum recom-
mendedis 0.1
μ
F in parallel with 1
μ
F electrolytic.
NE555/SA555/SE555
8/10
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