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TS556CN Datasheet(PDF) 9 Page - STMicroelectronics |
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TS556CN Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 11 page ASTABLE OPERATION When the circuit is connected as shown in figure 4 it triggers itself and free runs as a multivibrator. The external capacitor charges through RA and RB and discharges through RB only. Thus the duty cycle may be precisely set by the ratio of these two resistors. In the astable mode of operation, C charges and discharges between 1/3 VCC and 2/3 VCC.As in the triggered mode, the charge and discharge times and therefore frequency, are independent of the supply voltage. Figure 5 shows actual waveforms generated in this mode of operation. The charge time (output HIGH) is given by : t1 = 0.693 (RA +RB)C and the discharge time (output LOW) by : t2 = 0.693 (RB)C Thus the total period T is given by : T = t1 + t2 = 0.693 (RA +2RB)C The frequency of oscillation is then : f = 1 T = 1.44 (RA + 2RB)C The duty cycle is given by : D = RB RA + 2RB VCC Reset Out R C R A B Control Voltage 0.01 F µ 1/2 TS556 Figure 4 Ω Ω µ t = 0.5 ms / div OUTPUT VOLTAGE = 5.0V/div CAPACITOR VOLTAGE = 1.0V/div L R = R = 4.8 k , C = 0.1 F , R = 1.0k AB Figure 5 TS556C,I,M 9/11 |
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