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TS555MN Scheda tecnica(PDF) 9 Page - STMicroelectronics |
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TS555MN Scheda tecnica(HTML) 9 Page - STMicroelectronics |
9 / 12 page ASTABLE OPERATION When the circuit is connected as shown in figure 4 (pin 2 and 6 connected) it triggers itself and free runs as a multivibrator. The external capacitor charges through RA and RB an d discharges through RB only. Thus the duty cycle may be pre- cisely 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 3 4 8 7 5 1 TS555 R C 2 6 R A B Control Voltage 0.01 F µ 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 TS555C,I,M 9/12 |
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