Figure 5. Hfe current gain versus base current
12000
10000
Vce=5V
8000 Ta=25°C
6000
Vce=1V
4000
2000
0
.01
.1
1
10
100
Base Current
Figure 6. Low to high propagation delay versus collector
load resigstance and LED current
80 Ta = 25°C, Vcc = 5V
Vth = 1.5 V
1KΩ
60
220Ω
40
470Ω
20
100Ω
0
0
5
10
15
20
IF - LED Current - mA
Figure 7. High to low propagation delay versus collector
load resistance and LED current
20
1KΩ
Ta = 25°C
15
Vcc = 5 V
Vth = 1.5 V
10
100Ω
5
0
0
5
10
15
20
IF - LED Current - mA
Figure 8. Switching waveforms
IF
tD
VO
tR
tPLH
tPHL
VTH=1.5 V
tS
tF
Figure 9. Switching schematic
VCC=13.5 V
F=10 KHz,
DF=50%
RC
VO
IF=50 mA
IL/D/Q30/31/55
5–3