參數(shù)資料
型號： PS2607L
廠商： NEC Corp.
英文描述： Optocoupler Applications
中文描述： 光耦應(yīng)用
文件頁數(shù)： 9/38頁
文件大?。?/td> 223K
代理商： PS2607L
8
STABILIZING OUTPUT LEVELS
When an optocoupler is used with the base pin of its phototransistor open, the collector dark current (I
CEO
) flows as a base
current. The current is amplified as a collector current and could make the output level of the phototransistor unstable. To
eliminate this unwanted base current and make the output level stable, flow the collector dark current (I
CEO
) through the base-
emitter resistor (R
BE
).
Fig 2-5 shows the I
CEO
vs. T
A
characteristics of a PS2601 optocoupler.
R
BE
=
8
I
F
= 0
V
CE
= 80V (40V for the
PS2603) 2601
Solid line: PS2601
Dotted line: PS2603
10000
R
BE
= 1M
R
BE
=100 M
1000
100
10
1
0.1
- 20
0
20
40
60
80
100
R
BE
=1M
C
C
Ambient Temperature T
A
(
°
C)
ELIMINATION OF INDUCED NOISE
Generally, machine-controlling equipment generates induced noise which may cause malfunctions. This unwanted noise in input
signals can be isolated by means of optocouplers. However, if the noise is too strong, it may be switched to the output through
the input-output capacitance C
1-2
of the optocoupler. This unwanted noise in the output can be removed in the following manner.
Insert a capacitor (preferably 100 pF) between the base and the emitter of the phototransistor of the optocoupler. This capacitor
delays response and suppresses malfunctions.
Graph 6-(a) to 6-(d) show how an external noise (surge voltage of 1000 V/
μ
s at rise time) is eliminated as the capacitance of the
base-emitter capacitor.
A fluctuation in the collector-emitter voltage caused by the on/off operation of a power switch at the output of the optocoupler
causes a base current to flow through the collector-base capacitor (C
CB
), which causes a malfunction.
In Fig. 2-7, for example, an instantaneous base current flows through the collector-base capacitor (C
CB
) of the optocoupler. The
current is multiplied by h
FE
(as a collector current) and causes an output voltage on both ends of the load resistance. It seems as
if an input signal was applied to the optocoupler. Graph 7-(a) shows the waveforms. This unwanted instantaneous induction
current can be eliminated by inserting a capacitor C
BE
between the emitter and the base of the phototransistor. Graph 7-(b)
shows the waveforms. Fig. 2-8 shows the output-voltage vs. C
BE
characteristics.
C
BE
V
o
R
L
Figure 2-6.
Figure 2-7.
PS2601 I
CEO
-T
A
Characteristics
Figure 2-5. I
CEO
vs. T
A
Characteristics
相關(guān)PDF資料
PDF描述
PS2608 Optocoupler Applications
PS2608L Optocoupler Applications
PS2621 Optocoupler Applications
PS2621L Optocoupler Applications
PS2622 Optocoupler Applications
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PS2608 功能描述:晶體管輸出光電耦合器 DISC-BY-CEL-1/01 DIP-6 PHOTOCOUPLER RoHS:否 制造商:Vishay Semiconductors 輸入類型:DC 最大集電極/發(fā)射極電壓:70 V 最大集電極/發(fā)射極飽和電壓:0.4 V 絕緣電壓:5300 Vrms 電流傳遞比:100 % to 200 % 最大正向二極管電壓:1.65 V 最大輸入二極管電流:60 mA 最大集電極電流:100 mA 最大功率耗散:100 mW 最大工作溫度:+ 110 C 最小工作溫度:- 55 C 封裝 / 箱體:DIP-4 封裝:Bulk
PS2608L 功能描述:晶體管輸出光電耦合器 DISC BY CEL 7/01 SO-6 PHOTOCOUPLER RoHS:否 制造商:Vishay Semiconductors 輸入類型:DC 最大集電極/發(fā)射極電壓:70 V 最大集電極/發(fā)射極飽和電壓:0.4 V 絕緣電壓:5300 Vrms 電流傳遞比:100 % to 200 % 最大正向二極管電壓:1.65 V 最大輸入二極管電流:60 mA 最大集電極電流:100 mA 最大功率耗散:100 mW 最大工作溫度:+ 110 C 最小工作溫度:- 55 C 封裝 / 箱體:DIP-4 封裝:Bulk
PS260MA24 功能描述:EMI/RFI 抑制器及鐵氧體 PCB Shield Enclosure RoHS:否 制造商:Fair-Rite 產(chǎn)品:Ferrite Cores 阻抗:365 Ohms 容差: 最大直流電流: 最大直流電阻: 工作溫度范圍:- 55 C to + 125 C 封裝 / 箱體: 端接類型:SMD/SMT
PS260MA24A 功能描述:EMI/RFI 抑制器及鐵氧體 PCB Shield Enclosure Adhesive Base RoHS:否 制造商:Fair-Rite 產(chǎn)品:Ferrite Cores 阻抗:365 Ohms 容差: 最大直流電流: 最大直流電阻: 工作溫度范圍:- 55 C to + 125 C 封裝 / 箱體: 端接類型:SMD/SMT
PS260MA44 功能描述:EMI/RFI 抑制器及鐵氧體 PCB Shield Enclosure RoHS:否 制造商:Fair-Rite 產(chǎn)品:Ferrite Cores 阻抗:365 Ohms 容差: 最大直流電流: 最大直流電阻: 工作溫度范圍:- 55 C to + 125 C 封裝 / 箱體: 端接類型:SMD/SMT
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*