參數(shù)資料
型號(hào)： PS2621
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)： 37/38頁(yè)
文件大小： 223K
代理商： PS2621
36
Example 3: Sequencer circuit input section
AC 100 V
PS2505-2
Common
Common
PS2501-2
AC 100V
(a) AC input compatible optocoupler
(bidirectional input)
(b) Conventional optocoupler
(one-direction input)
(Full-wave rectified by diode bridge)
PRECAUTIONS FOR DESIGN
The AC input compatible optocoupler is identical to the conventional optocoupler except for the presence of two LEDs connected
in reverse parallel in the input circuit. Therefore, the circuit configuration can be designed as conventionally. The difference is
that there are two types of current transfer ratios (CRT) because two LEDs are connected in the input circuit. The two CTRs are
not necessarily the same, owing to the differences in light emission and coupling efficiencies of LEDs. Consequently, this causes
deviation in output signal level. The differences are rated under the item of the current efficiency ratio (CTR
1
/CTR
2
) for electric
characteristics.
Current transfer ratio (CTR
1
/CTR
2
)
I
C1
CTR
1
=
I
F1
x (current flowing in LED1)
I
C2
CTR
2
=
I
F2
x (current flowing in LED2)
A
I
F1
A
A
I
F2
LED 2
LED 1
I
C1
I
C2
V
CE
= 5 V
Figure 5. CTR Measuring Circuit
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PS2621L 制造商:NEC 制造商全稱(chēng):NEC 功能描述:Optocoupler Applications
PS2622 制造商:NEC 制造商全稱(chēng):NEC 功能描述:Optocoupler Applications
PS2622L 制造商:NEC 制造商全稱(chēng):NEC 功能描述:Optocoupler Applications
PS2625 制造商:NEC 制造商全稱(chēng):NEC 功能描述:Optocoupler Applications
PS2625L 制造商:NEC 制造商全稱(chēng):NEC 功能描述:Optocoupler Applications
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