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MC3456 Folha de dados(PDF) 6 Page - ON Semiconductor |
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MC3456 Folha de dados(HTML) 6 Page - ON Semiconductor |
6 / 10 page MC3456 6 MOTOROLA ANALOG IC DEVICE DATA Figure 15. Monostable Circuit Figure 16. Monostable Waveforms Figure 17. Astable Circuit (RA = 10 kΩ, C = 0.01 µF, RL = 1.0 kΩ, VCC = 15 V) t = 20 µs/cm (RA = 5.1 kΩ, C = 0.0 1 µF, RL = 1.0 kΩ, RB = 3.9 kΩ, VCC = 15 V) t = 50 µs/cm Figure 18. Astable Waveforms Control Voltage 3 (11) RL +VCC (5.0 to 15 V) Reset VCC 14 Discharge 1 (13) 2 (12) Threshold 0.01 µF 7 6 (8) Trigger Output 5 (9) 4 (10) RA RL C Gnd 1/2 MC3456 RB RL +VCC (5.0 V to 15 V) Reset VCC 14 Discharge 1 (13) 2 (12) Threshold Control Voltage 0.01 µF 7 6 (8) Trigger Output 5 (9) 4 (10) RA RL C 3 (11) Gnd 1/2 MC3456 Pin numbers in parenthesis ( ) indicate B–Channel Astable Mode In the astable mode the timer is connected so that it will retrigger itself and cause the capacitor voltage to oscillate between 1/3 VCC and 2/3 VCC (see Figure 17). The external capacitor charges to 2/3 VCC through RA and RB and discharges to 1/3 VCC through RB. By varying the ratio of these resistors the duty cycle can be varied. The charge and discharge times are independent of the supply voltage. The charge time (output high) is given by: t1 = 0.695 (RA+RB) C The discharge time (output low) by: t2 = 0.695 (RB) C Thus the total period is given by: T = t1 + t2 = 0.695 (RA + 2RB) C The frequency of oscillation is then: f = 1 T = (RA +2RB) C 1.44 and may be easily found as shown in Figure 19. RA +2RB RB The duty cycle is given by: DC = To obtain the maximum duty cycle, RA must be as small as possible; but it must also be large enough to limit the discharge current (Pin 7 current) within the maximum rating of the discharge transistor (200 mA). The minimum value of RA is given by: RA ≥ VCC (Vdc) I7 (A) ≥ VCC (Vdc) 0.2 Figure 19. Free Running Frequency 100 10 1.0 0.1 0.01 0.001 (RA + 2 RB) 0.1 1.0 10 100 1.0 k 10 k 100 k f, FREE RUNNING FREQUENCY (Hz) |
Nº de peça semelhante - MC3456 |
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Descrição semelhante - MC3456 |
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