參數(shù)資料
型號: PS2608
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?。?/td> 223K
代理商: PS2608
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
PS2608L Optocoupler Applications
PS2621 Optocoupler Applications
PS2621L Optocoupler Applications
PS2622 Optocoupler Applications
PS2622L Optocoupler Applications
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