參數(shù)資料
型號(hào)： PS2605
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)： 19/38頁(yè)
文件大?。?/td> 223K
代理商： PS2605
18
V
CC
- V
CE
5 - 0.8
I2
⊕
= = 8.2 (mA) ................(9)
R
2
0.51 (k
)
Therefore I
3
= I
2
+ I
4
= 8.2 + 1.6 = 9.8 (mA) ................(10)
Let's assume that h
FE
of transistor T
r1
is 40 (worst). I
b
must be as follows:
I
3
9.9 (mA)
I
b
⊕
= = 0.247 (mA) ................(11)
h
FE
40
Similarly, let's assume that V
BE
of transistor T
r1
is 0.8 V (worst), I
1
must be as follows:
V
BE
0.8
I
1
= = = 0.4 (mA) ................(12)
R
1
2 (k
)
Therefore, the output current I
0
of the optocoupler is
I0
⊕
I
1
+ I
b
= 0.647 (mA) ................ (13)
If forward current I
F
is 3 mA (worst) (normally I
F
= 5 mA), the CTR is calculated as follows:
I
0
0.647(mA)
CTR = x 100 = x 100 = 21.6% ................(14)
I
F
3 (mA)
CIRCUIT DESIGN EXAMPLE (USING THE PS2601)
Fig. 4-1 shows a design example of an optocoupler circuit having a base-emitter resistor for improvement of response ability.
The minimum current transfer ratio (CTR) required for TTL operation is calculated as follows:
Current I
4
must be 1.6 mA to drive the TTL and the collector-emitter voltage of transistor T
r1
must be 0.8 V or less. Accordingly, I
2
must be as follows:
A resistor of 510 k
is inserted here.
PS2601
I
F
= 5 mA
I
0
I
1
Vcc = 5 V
V
OUT
G
I
3
I
4
T
n1
I
b
R
2
= 510
TTL
R
0
= 1 k
R
1
= 2 k
Figure 4-1. Circuit Design Example
相關(guān)PDF資料
PDF描述
PS2605L Optocoupler Applications
PS2606 Optocoupler Applications
PS2606L Optocoupler Applications
PS2607 Optocoupler Applications
PS2607L Optocoupler Applications
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PS2605L 制造商:NEC 制造商全稱:NEC 功能描述:Optocoupler Applications
PS2606 制造商:NEC 制造商全稱:NEC 功能描述:Optocoupler Applications
PS2606L 制造商:NEC 制造商全稱:NEC 功能描述:Optocoupler Applications
PS2607 制造商:California Eastern Laboratories (CEL) 功能描述:6pin DIP,Darlington Tr, AC, Base, Coupler
PS2607L 功能描述:晶體管輸出光電耦合器 DISC BY CEL 4/01 SO-6 PHOTOCOUPLER RoHS:否 制造商:Vishay Semiconductors 輸入類型:DC 最大集電極/發(fā)射極電壓:70 V 最大集電極/發(fā)射極飽和電壓:0.4 V 絕緣電壓:5300 Vrms 電流傳遞比:100 % to 200 % 最大正向二極管電壓:1.65 V 最大輸入二極管電流:60 mA 最大集電極電流:100 mA 最大功率耗散:100 mW 最大工作溫度:+ 110 C 最小工作溫度:- 55 C 封裝 / 箱體:DIP-4 封裝:Bulk
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