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參數(shù)資料
| 型號： | PS2603 |
| 廠商： | NEC Corp. |
| 英文描述： | Optocoupler Applications |
| 中文描述： | 光耦應用 |
| 文件頁數(shù)： | 15/38頁 |
| 文件大小： | 223K |
| 代理商： | PS2603 |
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14
NOTES ON USE OF OPTOCOUPLER BASE PIN
This chapter explains the reduction of a current transfer ratio of an optocoupler whose base and emitter are connected by a
resistor (R
BE
) and other optocouplers that seem to be significant in the treatment of the base pin of an optocoupler.
EQUIVALENT CIRCUIT (FOR PS2601 OPTOCOUPLER)
Fig. 3-1 shows an equivalent circuit of a single-transistor optocoupler such as the PS2601.
C
j
C
BE
: Base-emitter capacitance
R
D
: Resistor serially connected to LED
I
CBL
: Collector-base photocurrent generated by the light of the LED
C
1-2
: Input-output capacitance
T
r
: Amplifying transistor
: Junction capacity of LED
DEFINITION OF CURRENT TRANSFER RATIO (CTR)
A current transfer ratio (CTR) of an optocoupler indicates the rate of an output current I
C
of its phototransistor to a forward input
current (I
F
) flowing through its light-emitting diode (LED). The CTR is expressed by:
I
C
CTR = x = 100 (%) ................(2)
I
F
where I
C
= I
CBL
h
FE
..............................(3)
(h
FE
: D.C. current amplification factor of the phototransistor)
Figure 3-1. Equivalent Circuit (for PS2601 Optocoupler)
A
K
C
j
C
1-2
C
CB
C
BE
I
CBL
T
r
C
E
B
R
D
相關PDF資料 |
PDF描述 |
|---|---|
| PS2603L | Optocoupler Applications |
| PS2604 | Optocoupler Applications |
| PS2604L | Optocoupler Applications |
| PS2602 | Optocoupler Applications |
| PS2602L | Optocoupler Applications |
相關代理商/技術參數(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: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:NEC 功能描述:Optocoupler Applications |
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