- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄9437 > NE555DX (Fairchild Semiconductor)IC OSC MONO TIMING 8-SOP PDF資料下載
參數(shù)資料
| 型號： | NE555DX |
| 廠商： | Fairchild Semiconductor |
| 文件頁數(shù)： | 2/13頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OSC MONO TIMING 8-SOP |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 類型： | 555 型，計(jì)時(shí)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： | 帶卷 (TR) |
| 供應(yīng)商設(shè)備封裝： | 8-SOP |
| 安裝類型： | 表面貼裝 |
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
()
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| VI-23K-MY-S | CONVERTER MOD DC/DC 40V 50W |
| VI-B0R-MX-B1 | CONVERTER MOD DC/DC 7.5V 75W |
| VI-B0P-MX-B1 | CONVERTER MOD DC/DC 13.8V 75W |
| MC100EL1648MG | IC OSC VCO 1.1GHZ 14SOEIAJ |
| MC100EL1648M | IC OSC VCO 1.1GHZ 14EIAJ |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NE555F | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Timer |
| NE555FK | 制造商:TI 制造商全稱:Texas Instruments 功能描述:PRECISION TIMERS |
| NE555G-D08-T | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:SINGLE TIMER |
| NE555G-S08-R | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:SINGLE TIMER |
| NE555G-S08-T | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:SINGLE TIMER |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。