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MC3456 Scheda tecnica(PDF) 8 Page - ON Semiconductor |
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MC3456 Scheda tecnica(HTML) 8 Page - ON Semiconductor |
8 / 10 page MC3456 8 MOTOROLA ANALOG IC DEVICE DATA 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 3. In this manner, the output pulse width can be modulated by applying a modulating signal that controls the threshold voltage. Test Sequences Several timers can be connected to drive each other for sequential timing. An example is shown in Figure 24 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 22. Pulse Width Modulation Waveforms Figure 23. Pulse Width Modulation Circuit t = 0.5 ms/cm (RA = 10 kW, C = 0.02 mF, VCC = 15 V) +VCC (5.0 V to 15 V) RL 4 (10) Reset VCC 14 RA Discharge 1 (13) Threshold 2 (12) Control 3 (11) C Modulation Input Output 5 (9) Trigger 6 (8) Output Clock Input Gnd 7 1/2 MC3456 Modulation Input Voltage 5.0 V/cm Clock Input Voltage 5.0 V/cm Output Voltage 5.0 V/cm Capacitor Voltage 5.0 V/cm Figure 24. Sequential Timing Circuit 9.1 k Threshold VCC Reset 27 k 9.1 k VCC Reset 27 k 50 k VCC Reset Control Output Load Gnd Gnd Load 5.0 µF 0.001 µF Gnd Trigger Discharge 1.0 µF Control Output 0.01 µF 0.001 µF Threshold Threshold Discharge Trigger 5.0 µF 0.01 µF Discharge Trigger Load VCC (5.0 V to 15 V) 0.01 µF Control Output 1/2 MC3456 1/2 MC3456 1/2 MC3456 |
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