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參數(shù)資料
| 型號： | PS2622 |
| 廠商： | NEC Corp. |
| 英文描述： | Optocoupler Applications |
| 中文描述： | 光耦應(yīng)用 |
| 文件頁數(shù)： | 14/38頁 |
| 文件大小： | 223K |
| 代理商： | PS2622 |
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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 |
|---|---|
| PS2622L | Optocoupler Applications |
| PS2653 | Optocoupler Applications |
| PS2653L2 | Optocoupler Applications |
| PS2654L2 | Optocoupler Applications |
| PS2625 | HIGH ISOLATION VOLTAGE AC INPUT LARGE FORWARD AC INPUT TYPE 6 PIN PHOTOCOUPLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PS2622L | 制造商:NEC 制造商全稱:NEC 功能描述:Optocoupler Applications |
| PS2625 | 制造商:NEC 制造商全稱:NEC 功能描述:Optocoupler Applications |
| PS2625L | 制造商:NEC 制造商全稱:NEC 功能描述:Optocoupler Applications |
| PS2626 | 制造商:California Eastern Laboratories (CEL) 功能描述:6pin DIP,Single Tr, AC, High Input, Coupler 制造商:Renesas Electronics 功能描述:Optocoupl AC-IN 1-CH Trans DC-OUT 6-Pin PDIP Cut Tape |
| PS2626L | 制造商:NEC 制造商全稱:NEC 功能描述:Optocoupler Applications |
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