參數(shù)資料
型號： PS2607
廠商： NEC Corp.
英文描述： Optocoupler Applications
中文描述： 光耦應(yīng)用
文件頁數(shù)： 25/38頁
文件大?。?/td> 223K
代理商： PS2607
24
C
C
Time (Hr)
Time (Hr)
Figure 6.
Figure 5.
CTR vs. T
A
Characteristics (T
A
: Ambient Temperature)
The CTR-Temperature characteristic is greatly affected by the total characteristics of light-emission efficiency of the LED and h
FE
of the phototransistor as the light-emission efficiency has a negative temperature coefficient and h
FE
has a positive temperature
coefficient. See Figure 7.
L
e
h
F
C
T
A
Figure 7. CTR vs. T
A
Characteristics
T
A
T
A
Current Transfer Ratio (CTR)
The current transfer ratio (CTR) of an optocoupler is the ratio of the value of output current I
C
to the value of input forward current
I
F
(I
C
/I
F
x 100%). The CTR is a parameter equivalent to the D.C. current amplification factor h
FE
of a transistor.
The CTR is one of the most significant characteristics of optocouplers, as well as isolation voltage. In circuit designing, CTR must
be considered first of all because the CTR:
1 varies as time goes by,
2 is affected by ambient temperature, and
3 is dependent upon forward current I
F
flowing through the LED.
Both PS2505 and PS2506 optocouplers (bidirectional input type) have two current transfer ratios (CTRs) because they have two
LEDs in the input. For further information, refer to Applications of Optocouplers for A.C. input.
Change of CTR over time
The current transfer ratio (CTR) of an optocoupler is determined by the light-emission efficiency of the LED (emitting infrared
light), efficiency of light transmission between the LED and the phototransistor, light sensitivity of the phototransistor, and h
FE
of
the transistor.
The change of a CTR over time is mainly caused by reduction of the light-emission efficiency of the LED. Generally, the CTR is
reduced to a greater extent as the forward current I
F
increases or as the operating temperature increases. Figure 5 and 6
respectively show estimated changes of CTRs of PS2501 and PS2505 optocouplers over time.
Estimated change of CTRs with time lapse (Standard values)
CHARACTERISTICS OF PS2501 AND PS2505 OPTOCOUPLERS
Standard value
Continuous supply of 20 mA (I
F
)
T
A
= 60
C T
A
= 25
C
1.2
1.0
0.8
0.6
0.4
0.2
0
10
10
10
10
10
2
3
4
5
6
1.2
1.0
0.8
0.6
0.4
0.2
0
10
10
10
10
2
3
4
5
Standard characteristics
I
F
= 5 mA
T
A
= 60
C
I
F
= 20 mA
T
A
= 25
C
I
F
= 5 mA
T
A
= 25
C
相關(guān)PDF資料
PDF描述
PS2607L Optocoupler Applications
PS2608 Optocoupler Applications
PS2608L Optocoupler Applications
PS2621 Optocoupler Applications
PS2621L Optocoupler Applications
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