參數(shù)資料
型號: PS2607L
廠商: NEC Corp.
英文描述: Optocoupler Applications
中文描述: 光耦應用
文件頁數(shù): 16/38頁
文件大?。?/td> 223K
代理商: PS2607L
15
I
CBL
I
CBL-
I
1
R
BE
I
1
V
BE
' V
(
1 -
)
................ (5)
I
C
h
FE
I
CBL
R
BE
As h
FE
' is equal to h
FE
if I
F
= approx. 5 mA, I
C
= approx. 15 mA, and R
BC
> 100 k
, expression (5) is simplified as follows:
' V
................ (6)
I
C
I
CBL
R
BE
I
C'
= h
FE
' (I
CBL
-I
1
) = h
FE
'
(
I
CBL
-
)
I
C'
= h
FE
'
I
CBL
(
1 -
................ (4)
I
CBL
R
BE
Note
I
C
'
h
FE
'
: Output current of an optocoupler having R
BE
: Amplification factor of an optocoupler having R
BE
Accordingly, the ratio of output current IC' (of the optocoupler having R
BE
) to output current IC (of the optocoupler with the base
open) is expressed by:
REDUCTION OF CURRENT TRANSFER RATIO (CTR) BY INSERTION OF BASE-
EMITTER RESISTOR
A resistor (R
BE
) connected to the base and emitter pins of an optocoupler causes the reduction of the output current (reduction of
current transfer ratio). This is because a part (I
1
) of the base current flows through the base-emitter resistor and causes a voltage
equivalent to the emitter-base voltage (V
BE
). The base current is reduced by this current component (I
1
) and, as the result, the
current transfer ratio (C
TR
) goes down. The output current I
C
' is expressed as follows:
V
BE
R
BE
V
BE
I
C
' h
FE
BE
I
BE
Figure 3-2.
相關PDF資料
PDF描述
PS2608 Optocoupler Applications
PS2608L Optocoupler Applications
PS2621 Optocoupler Applications
PS2621L Optocoupler Applications
PS2622 Optocoupler Applications
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