參數(shù)資料
型號(hào): PS2605L
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): 15/38頁(yè)
文件大?。?/td> 223K
代理商: PS2605L
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
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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(lèi)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
PS2608 功能描述:晶體管輸出光電耦合器 DISC-BY-CEL-1/01 DIP-6 PHOTOCOUPLER RoHS:否 制造商:Vishay Semiconductors 輸入類(lèi)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