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PDF PS2653 Data sheet ( Hoja de datos )
| Número de pieza | PS2653 | |
| Descripción | Optocoupler Applications | |
| Fabricantes | NEC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de PS2653 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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California Eastern Laboratories
Optocoupler
Applications
1 page  
Input
ton
50%
90%
90%
toff
Output
10%
10%
Figure 2-2. ton/toff Measuring Points
As judged from expression (1), the turn-off time toff is affected by collector-base capacitance CC-B, D.C. current amplification
factor hFE, and load resistance LR. In actual circuit design, CC-B and hFE are fixed. Accordingly, the turn-off time is significantly
affected by the resistance of load RL.
Graph 1 shows the relationship between response speed (ton,toff) and load resistance (RL) in typical emitter follower (test circuit 1)
having a load resistance of 100 Ω.
( )PW = 100 µs
Duty = 1/10
IF = 5 mA
PS2601
Input
monitor
51 Ω
VCC = 5 V
Vo
RL = 100 Ω
Test Circuit 1
Input
monitor
Vo
Graph 1
Up : Input 0.2 V/DIV
DOWN : Output 0.5 V/DIV
(50 µs/DIV)
4
5 Page 
Vin (dV/dt = 10 V/µs, 2 V/DIV)
CCB
Vin
Vo (0.1 V/DIV)
(500 ns/DIV)
Graph 7-(a)
Input Voltage Fluctuation and Output
Vin (dV/dt = 10 V/µs, 2 V/DIV)
CCB
Vo
5 kΩ
Vin
Vo (0.1 V/DIV)
(500 ns/DIV)
Graph 7-(b)
Effect of Collector-Base Capacitance on
Voltage Fluctuation
1000 pF
5 kΩ
Vo
10
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet PS2653.PDF ] | |
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