參數(shù)資料
型號(hào)： PS2603
廠商： NEC Corp.
英文描述： Optocoupler Applications
中文描述： 光耦應(yīng)用
文件頁(yè)數(shù)： 14/38頁(yè)
文件大?。?/td> 223K
代理商： PS2603
13
ELIMINATION OF INPUT SURGES
Unwanted external noise and output leakage currents (e.g., collector current I
C
) of a preceding transistor may cause the light-
emitting diode (LED) of an optocoupler to light involuntarily. Usually, a circuit (connecting a resistor in parallel to the LED) is
provided to absorb such input surges. To prevent malfunction of an optocoupler, it is also effective to insert a resistor (R
BE
) that
increases the input threshold current (by the use of the input-output characteristics) between the base and the emitter of the
phototransistor. In this case, the current transfer ratio (CTR) must be low. (See 3.3 for Reduction of CTR.)
60
50
40
30
20
10
0
R
BE
=
8
200 k
100 k
50 k
30 k
20 k
10 k
5 k
V
CE
= 5 V
(PS2601)
1
2
3
4 5
10
20
30 40 50
C
C
Figure 2-9. I
C
vs. I
F
Characteristics (Example)
Forward Current I
F
(mA)
APPLICATION TO HIGH POTENTIAL CIRCUIT
The withstanding voltage between the collector and the emitter of the PS2601 optocoupler is 80 V (
MAX
). To make the
optocoupler available to higher withstanding voltages, use the collector-base junction photodiode as a light-sensitive element and
connect a high-voltage circuit to the output of the optocoupler. In this case, the output of the photodiode must be amplified
because it is smaller than the usual output.
Fig. 2-10 shows an example of an optocoupler applied to a high-voltage circuit. In this sample circuit, the photocurrent (I
CBL
) of
the optocoupler is fed to the base of the high-voltage transistor and a current (I
F
) passes forward through the light-emitting diode
(LED). Fig. 2-11 shows the I
CBL
vs. I
F
characteristics. Before working on applications outside the rated values of the
optocouplers, evaluate the practical circuits fully by contacting CEL.
C
C
μ
A
Figure 2-10. Application to a
High Voltage Circuit
Figure 2-11. I
CBL
vs. I
F
Characteristic
PS2601
I
CBL
H
t
r
)
200
100
50
40
30
20
10
5
4
3
2
1
1
2
3
4 5
10
20
30 40 50
80
V
CB
= 100V
(PS2601)
I
F
I
CBL
CTR = 274%
CTR = 166%
100V
A
相關(guān)PDF資料
PDF描述
PS2603L Optocoupler Applications
PS2604 Optocoupler Applications
PS2604L Optocoupler Applications
PS2602 Optocoupler Applications
PS2602L Optocoupler Applications
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PS2603L 制造商: 功能描述: 制造商:undefined 功能描述:
PS2604 制造商:California Eastern Laboratories (CEL) 功能描述:6pin DIP,Darlington Tr, DC, Coupler
PS2604L 制造商:NEC 制造商全稱(chēng):NEC 功能描述:Optocoupler Applications
PS2605 制造商:California Eastern Laboratories (CEL) 功能描述:6pin DIP,Single Tr, AC, Base, Coupler
PS2605L 制造商:NEC 制造商全稱(chēng):NEC 功能描述:Optocoupler Applications
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