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MC1455BDR2G bảng dữ liệu(PDF) 8 Page - ON Semiconductor |
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MC1455BDR2G bảng dữ liệu(HTML) 8 Page - ON Semiconductor |
8 / 11 page 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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