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MC1455DR2 Folha de dados(PDF) 7 Page - ON Semiconductor |
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MC1455DR2 Folha de dados(HTML) 7 Page - ON Semiconductor |
7 / 11 page MC1455, MC1455B, NCV1455B http://onsemi.com 7 APPLICATIONS INFORMATION Linear Voltage Ramp In the monostable mode, the resistor can be replaced by a constant current source to provide a linear ramp voltage. The capacitor still charges from 0 VCC to 2/3 VCC. The linear ramp time is given by: t = 2 3 VCC 1 , where I = VCC − VB − VBE RE If VB is much larger than VBE, then t can be made independent of VCC. Missing Pulse Detector The timer can be used to produce an output when an input pulse fails to occur within the delay of the timer. To accomplish this, set the time delay to be slightly longer than the time between successive input pulses. The timing cycle is then continuously reset by the input pulse train until a change in frequency or a missing pulse allows completion of the timing cycle, causing a change in the output level. Figure 20. Linear Voltage Sweep Circuit Figure 21. Missing Pulse Detector Figure 22. Linear Voltage Ramp Waveforms Figure 23. Missing Pulse Detector Waveforms Discharge Threshold VCC Reset 4 3 Digital Output 2 Trigger 1 MC1455 8VCC RE R1 2N4403 or Equiv VB R2 C 7 6 5 Sweep Output 0.01 mF Control Voltage +VCC (5.0 V to 15 V) Reset RL VCC RA 7 6 5 Control Voltage 0.01 mF 1 Trigger Input Output 48 C 2N4403 or Equiv MC1455 t = 100 ms/cm VE 3 2 t = 500 ms/cm (RE = 10 kW, R2 = 100 kW, R1 = 39 kW, C = 0.01 mF, VCC = 15 V) (RA = 2.0 kW, RL = 1.0 kW, C = 0.01 mF, VCC = 15 V) I |
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