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參數(shù)資料
| 型號： | SA555D |
| 廠商： | Fairchild Semiconductor |
| 文件頁數(shù)： | 2/13頁 |
| 文件大小： | 0K |
| 描述： | IC OSC MONO TIMING 8-SOP |
| 標(biāo)準(zhǔn)包裝： | 8,100 |
| 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： | -40°C ~ 85°C |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 包裝： | 管件 |
| 供應(yīng)商設(shè)備封裝： | 8-SOP |
| 安裝類型： | 表面貼裝 |
| 其它名稱： | SA555DFS |
LM555
—
Single
T
imer
2002 Fairchild Semiconductor Corporation
www.fairchildsemi.com
LM555 Rev. 1.1.0
10
In Figure 14, current source is created by PNP transistor Q1 and resistor R1, R2, and RE.
For example, if VCC = 15 V, RE = 20 kΩ, R1 = 5 kΩ, R2 = 10 kΩ, and VBE = 0.7 V,
VE=0.7 V+10 V=10.7 V, and
IC=(15-10.7) / 20 k=0.215 mA.
When the trigger starts in a timer configured as shown in Figure 14, the current flowing through capacitor C1 becomes
a constant current generated by PNP transistor and resistors.
Hence, the VC is a linear ramp function as shown in Figure 15. The gradient S of the linear ramp function is defined as
follows:
Here the Vp-p is the peak-to-peak voltage.
If the electric charge amount accumulated in the capacitor is divided by the capacitance, the VC comes out as follows:
V = Q/C
(15)
The above equation divided on both sides by t gives:
and may be simplified into the following equation:
S = I/C
(17)
In other words, the gradient of the linear ramp function appearing across the capacitor can be obtained by using the
constant current flowing through the capacitor.
If the constant current flow through the capacitor is 0.215 mA and the capacitance is 0.02
μF, the gradient of the ramp
function at both ends of the capacitor is S = 0.215 m / 0.022
μ = 9.77 V/ms.
I
C
V
CC
V
E
–
R
E
---------------------------
=12
()
Here, V
E is
V
E
V
BE
R
2
R
1
R
2
+
----------------------V
CC
+
=13
()
S
V
pp
–
----------------
=14
()
V
----
Q §
C
-------------
=16
()
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SA555D | 制造商:STMicroelectronics 功能描述:Timer IC 制造商:Texas Instruments 功能描述:IC SM TIMER 制造商:STMicroelectronics 功能描述:IC, BIPOLAR TIMER, 500KHZ, 16V, 8-SOIC |
| SA555DE4 | 功能描述:計時器和支持產(chǎn)品 PRECISION TIMER RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| SA555DG4 | 功能描述:計時器和支持產(chǎn)品 PRECISION TIMER RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| SA555DR | 功能描述:計時器和支持產(chǎn)品 Precision RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| SA555DRE4 | 功能描述:計時器和支持產(chǎn)品 PRECISION TIMER RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
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