參數(shù)資料
型號: LM555CM
廠商: Fairchild Semiconductor
文件頁數(shù): 11/13頁
文件大小: 0K
描述: IC OSC MONO TIMING 8-SOP
標準包裝: 90
類型: 555 型,計時器/振蕩器(單路)
電源電壓: 4.5 V ~ 16 V
電流 - 電源: 7.5mA
工作溫度: 0°C ~ 70°C
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
包裝: 管件
供應商設備封裝: 8-SOP
安裝類型: 表面貼裝
產(chǎn)品目錄頁面: 1220 (CN2011-ZH PDF)
其它名稱: LM555CMFS
LM555
Single
T
imer
2002 Fairchild Semiconductor Corporation
www.fairchildsemi.com
LM555 Rev. 1.1.0
7
The equivalent circuit for discharging capacitor C1, when timer output is low is, as follows:
Since the duration of the timer output low state (tL) is the amount of time it takes for the VC1(t) to reach VCC/3,
Since RD is normally RB>>RD although related to the size of discharging transistor,
tL = 0.693RBC1
(10)
Consquently, if the timer operates in astable, the period is the same with
't = tH+tL = 0.693(RA+RB)C1+0.693RBC1 = 0.693(RA+2RB)C1'
because the period is the sum of the charge time and discharge time. Since frequency is the reciprocal of the period,
the following applies:
C1
R
B
R
D
V
C1(0-)=2Vcc/3
C
1
dv
C1
dt
---------------
1
R
A
R
B
+
----------------------- V
C1
0
=
+6
()
V
C1
t
()
2
3
---V
CC
e
-
t
R
A
R
D
+
()C1
-------------------------------------
=7
()
---
+
()
-------------------------------------
=
()
+
()
+
()
=
()
frequency,
f
1
---
1.44
R
A
2R
B
+
()C
1
----------------------------------------
==
11
()
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