参数资料
型号: MC1455DR2G
厂商: ON Semiconductor
文件页数: 10/11页
文件大小: 0K
描述: IC OSC MONO TIMING 8-SOIC
标准包装: 1
类型: 555 型,计时器/振荡器(单路)
电源电压: 4.5 V ~ 16 V
电流 - 电源: 10mA
工作温度: 0°C ~ 70°C
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
包装: 剪切带 (CT)
供应商设备封装: 8-SOICN
安装类型: 表面贴装
其它名称: MC1455DR2GOSCT
MC1455, MC1455B, NCV1455B
http://onsemi.com
8
Pulse Width Modulation
If the timer is triggered with a continuous pulse train in the
monostable mode of operation, the charge time of the
capacitor can be varied by changing the control voltage at
Pin 5. In this manner, the output pulse width can be
modulated by applying a modulating signal that controls the
threshold voltage.
Figure 24. Pulse Width Modulator
+VCC (5.0 V to 15 V)
RL
Output
Clock
Input
Modulation
Input
C
7
6
5
RA
48
3
2
1
MC1455
t = 0.5 ms/cm
(RA = 10 kW, C = 0.02 mF, VCC = 15 V)
Figure 25. Pulse Width Modulation Waveforms
Test Sequences
Several timers can be connected to drive each other for
sequential timing. An example is shown in Figure 26 where
the sequence is started by triggering the first timer which
runs for 10 ms. The output then switches low momentarily
and starts the second timer which runs for 50 ms and so forth.
Figure 26. Sequential Timer
Load
MC1455
6
7
2
84
5
3
27 k
1
5.0
mF
Load
MC1455
9.1 k
6
7
1.0
mF
2
84
5
3
0.01
mF
27 k
1
0.001
mF
5.0
mF
MC1455
6
7
2
84
5
3
1
Load
0.001
mF
18.2 k
9.1 k
0.01
mF
0.01
mF
VCC (5.0 V to 15 V)
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