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TS3V556 データシート(PDF) 6 Page - STMicroelectronics |
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TS3V556 データシート(HTML) 6 Page - STMicroelectronics |
6 / 8 page TS3V556 6/8 V CC Reset Out R C R A B Control Voltage 0.01 F µ TS3V556 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 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 throughR A and RB and discharges through RB only. Thus the duty cycle may be precisely set by the ra- tio 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 TR R ) C B == + 1144 2 . ( A The duty cycle is given by : D R RR = + B AB 2 |
同様の部品番号 - TS3V556 |
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同様の説明 - TS3V556 |
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